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<h1 class="title" id="page-title"> Writeups </h1>
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<div id="block-system-main" class="clearfix block block-system"> <div class="content"> <div class="view view-writeups view-id-writeups view-display-id-page view-dom-id-ea02451354d90e66d9d7b92ae01c64cd">
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<div class="views-row views-row-1 views-row-odd views-row-first">
<article id="node-29" class="node node-writeup node-promoted node-teaser clearfix"> <div class="bookmark-wrapper">
<div class="type bg-0B">writeup</div>
<div class="bookmark">
<span class="day">01</span>
<span class="month">Mar</span>
</div>
<a href="writeups%3Fpage=6.html#node-29" class="link"><i class="fa fa-link"></i></a>
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<div class="node-wrapper">
<h2><a href="writeup/29.html">Xorxes the Hash (Crypto 200)</a></h2>
<div class="submitted">
01.03.2014 16:13, by <i class="fa fa-user"></i><span class="username">Triff</span> </div>
<div class="content">
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Category: </div><div class="field-items"><div class="field-item even"><a href="categories/crypto.html">crypto</a></div></div></div><div class="field field-name-field-event field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Event: </div><div class="field-items"><div class="field-item even"><a href="event/15.html">Boston Key Party 2014</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><strong>Task:</strong></p><p style="box-sizing: border-box; margin-bottom: 10px;">Xorxes is a hash collision challenge. The goal is to find a second preimage for the input string "Klaatubaradanikto". Submit it as the flag. UPDATE: It has been pointed out that there are multiple solutions. The flag is the one with md5sum '7179926e4253a0b405090df67f62c543'. (Use `echo -n FLAG | md5sum'.) UPDATE THE SECOND: The solution is short.</p><p style="box-sizing: border-box; margin-bottom: 10px;">http://bostonkeyparty.net/challenges/xorxes-ad7b52380d3ec704b28954c80119789a.py</p><p style="box-sizing: border-box; margin-bottom: 10px;"></div></div></div> </div>
<ul class="links inline"><li class="node-readmore first last"><a href="writeup/29.html" rel="tag" title="Xorxes the Hash (Crypto 200)">Read more<span class="element-invisible"> about Xorxes the Hash (Crypto 200)</span></a></li>
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<div class="views-row views-row-2 views-row-even">
<article id="node-27" class="node node-writeup node-promoted node-teaser clearfix"> <div class="bookmark-wrapper">
<div class="type bg-0B">writeup</div>
<div class="bookmark">
<span class="day">24</span>
<span class="month">Feb</span>
</div>
<a href="writeups%3Fpage=6.html#node-27" class="link"><i class="fa fa-link"></i></a>
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<div class="node-wrapper">
<h2><a href="writeup/27.html">Automata</a></h2>
<div class="submitted">
24.02.2014 14:31, by <i class="fa fa-user"></i><span class="username">Triff</span> </div>
<div class="content">
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Category: </div><div class="field-items"><div class="field-item even"><a href="categories/reverse.html">reverse</a></div></div></div><div class="field field-name-field-event field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Event: </div><div class="field-items"><div class="field-item even"><a href="event/14.html">Codegate CTF Preliminary 2014</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><strong>Task:</strong></p><p>==========================================</p><p>OS : Ubuntu 13.10 x86</p><p>IP : 58.229.183.18 / TCP 8181</p><p>http://58.229.183.26/files/automata_7329666edefb3754ec91b7316e61bb7d</p><p>==========================================</p><p></div></div></div> </div>
<ul class="links inline"><li class="node-readmore first last"><a href="writeup/27.html" rel="tag" title="Automata">Read more<span class="element-invisible"> about Automata</span></a></li>
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<article id="node-25" class="node node-writeup node-promoted node-teaser clearfix"> <div class="bookmark-wrapper">
<div class="type bg-0B">writeup</div>
<div class="bookmark">
<span class="day">12</span>
<span class="month">Feb</span>
</div>
<a href="writeups%3Fpage=6.html#node-25" class="link"><i class="fa fa-link"></i></a>
</div>
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<h2><a href="writeup/25.html">Aski (Binathlon 300)</a></h2>
<div class="submitted">
12.02.2014 03:36, by <i class="fa fa-user"></i><span class="username">Dil4rd</span> </div>
<div class="content">
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Category: </div><div class="field-items"><div class="field-item even"><a href="categories/reverse.html">reverse</a></div></div></div><div class="field field-name-field-event field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Event: </div><div class="field-items"><div class="field-item even"><a href="event/13.html">Olympic CTF 2014</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><strong>Description:</strong></p><p style="padding-left: 30px;">Download <a title="Aski" href="http://shell-storm.org/repo/CTF/Olympic-2014/Aski/aski" target="_self">Aski</a>.</p><p><strong>Solution:</strong></p><p>After downloading file we can see that it's x86 ELF. The description tells us nothing, so the best way to understand what is it --- execution:) When we execute it, we will see a newly created conlose with very-very fast changing pictures (every picture is a set of ASCII symbols). Hmm.. maybe something intresting is hidden in those pictures?.. Let's take a look!</p></div></div></div> </div>
<ul class="links inline"><li class="node-readmore first last"><a href="writeup/25.html" rel="tag" title="Aski (Binathlon 300)">Read more<span class="element-invisible"> about Aski (Binathlon 300)</span></a></li>
</ul> </div>
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<div class="views-row views-row-4 views-row-even">
<article id="node-22" class="node node-writeup node-promoted node-teaser clearfix"> <div class="bookmark-wrapper">
<div class="type bg-0B">writeup</div>
<div class="bookmark">
<span class="day">09</span>
<span class="month">Feb</span>
</div>
<a href="writeups%3Fpage=6.html#node-22" class="link"><i class="fa fa-link"></i></a>
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<h2><a href="writeup/22.html">mic</a></h2>
<div class="submitted">
09.02.2014 22:58, by <i class="fa fa-user"></i><span class="username">Triff</span> </div>
<div class="content">
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Category: </div><div class="field-items"><div class="field-item even"><a href="categories/crypto.html">crypto</a></div></div></div><div class="field field-name-field-event field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Event: </div><div class="field-items"><div class="field-item even"><a href="event/13.html">Olympic CTF 2014</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><strong>Task:</strong></p><p style="box-sizing: border-box; margin-bottom: 10px; font-family: Arial, Helvetica, sans-serif;">Flags for free!</p><p style="box-sizing: border-box; margin-bottom: 10px; font-family: Arial, Helvetica, sans-serif;">nc 109.233.61.11 3120</p><p style="box-sizing: border-box; margin-bottom: 10px; font-family: Arial, Helvetica, sans-serif;"><em>Source code also provided (file mic_server.py)</em></p><p style="box-sizing: border-box; margin-bottom: 10px; font-family: Arial, Helvetica, sans-serif;"></div></div></div> </div>
<ul class="links inline"><li class="node-readmore first last"><a href="writeup/22.html" rel="tag" title="mic">Read more<span class="element-invisible"> about mic</span></a></li>
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<article id="node-15" class="node node-writeup node-promoted node-teaser clearfix"> <div class="bookmark-wrapper">
<div class="type bg-0B">writeup</div>
<div class="bookmark">
<span class="day">04</span>
<span class="month">Feb</span>
</div>
<a href="writeups%3Fpage=6.html#node-15" class="link"><i class="fa fa-link"></i></a>
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<h2><a href="writeup/15.html">Challenge 1: Guerilla</a></h2>
<div class="submitted">
04.02.2014 02:13, by <i class="fa fa-user"></i><span class="username">azrael</span> </div>
<div class="content">
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Category: </div><div class="field-items"><div class="field-item even"><a href="categories/web.html">web</a></div><div class="field-item odd"><a href="categories/ppc.html">ppc</a></div></div></div><div class="field field-name-field-event field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Event: </div><div class="field-items"><div class="field-item even"><a href="event/11.html">Teaser Insomnihack 2014</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>First we see the text on the page: <strong>"You must specify a nick". </strong>After quick look into source code of the page we understand that our URL must contain GET-parameter 'nick' with random value.</p><p>Then server sends us some leet-modified string like </p><pre class="brush: bash">51xty tw0 plu5 0n3
</pre><p>and expecting from us solution of this expression in the same format.</p><p>Experimentally found that there is only 4 leet-modified characters: '1' == 'i', '3' == 'e', '5' == 's', '0' == 'o'.</p></div></div></div> </div>
<ul class="links inline"><li class="node-readmore first last"><a href="writeup/15.html" rel="tag" title="Challenge 1: Guerilla">Read more<span class="element-invisible"> about Challenge 1: Guerilla</span></a></li>
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<article id="node-14" class="node node-writeup node-promoted node-teaser clearfix"> <div class="bookmark-wrapper">
<div class="type bg-0B">writeup</div>
<div class="bookmark">
<span class="day">02</span>
<span class="month">Feb</span>
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<h2><a href="writeup/14.html">yet another pyjail</a></h2>
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02.02.2014 15:21, by <i class="fa fa-user"></i><span class="username">briskly</span> </div>
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<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Category: </div><div class="field-items"><div class="field-item even"><a href="categories/misc.html">misc</a></div><div class="field-item odd"><a href="categories/pwn.html">pwn</a></div></div></div><div class="field field-name-field-event field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Event: </div><div class="field-items"><div class="field-item even"><a href="event/10.html">PHDays Quals IV</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>This task is new implementation of python sandbox.</p></div></div></div> </div>
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<span class="day">02</span>
<span class="month">Feb</span>
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<h2><a href="writeup/13.html">Markoff</a></h2>
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02.02.2014 12:30, by <i class="fa fa-user"></i><span class="username">briskly</span> </div>
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<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Category: </div><div class="field-items"><div class="field-item even"><a href="categories/ppc.html">ppc</a></div><div class="field-item odd"><a href="categories/trivia.html">trivia</a></div></div></div><div class="field field-name-field-event field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Event: </div><div class="field-items"><div class="field-item even"><a href="event/10.html">PHDays Quals IV</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>The name of this task connected to "Markov chain"</p>
<p>The main idea of that system is that the next state depends only on the current state, and there is a probability of transition.</p>
<p>First try shows, that one word phrases are shutting down the connection.</p>
<p>So we need to start with two word phrase. First hint is in the password:"talk_with_markov_about_positive_things".</p></div></div></div> </div>
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<span class="day">31</span>
<span class="month">Jan</span>
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<h2><a href="writeup/8.html">Secc</a></h2>
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31.01.2014 01:13, by <i class="fa fa-user"></i><span class="username">Triff</span> </div>
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<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Category: </div><div class="field-items"><div class="field-item even"><a href="categories/crypto.html">crypto</a></div></div></div><div class="field field-name-field-event field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Event: </div><div class="field-items"><div class="field-item even"><a href="event/10.html">PHDays Quals IV</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><div><strong>Задание:</strong></div><div> </div><div>This key verification scheme is built on elliptic crypto, bet this points are</div><div>impossible.</div><div> </div><div>nc 195.133.87.171 5555</div><div> </div><div>password: secch4l*</div><div> </div><div>Так же нам даны исходники этой схемы</div><div><span style="background-color: #dff0d8; color: #468847;"></div></div></div> </div>
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<span class="month">Jan</span>
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<h2><a href="writeup/6.html">Rbox</a></h2>
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30.01.2014 11:47, by <i class="fa fa-user"></i><span class="username">Triff</span> </div>
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<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Category: </div><div class="field-items"><div class="field-item even"><a href="categories/ppc.html">ppc</a></div></div></div><div class="field field-name-field-event field-type-taxonomy-term-reference field-label-inline clearfix"><div class="field-label">Event: </div><div class="field-items"><div class="field-item even"><a href="event/10.html">PHDays Quals IV</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><div> </div><div><strong>Задание:</strong></div><div> </div><div>Unhash this:</div><div>5ebad7dcbd73584f32ef949486a161a1e9f10e48ade43b03649a2ca680f327c4</div><div> </div><div>nc 195.133.87.165 5555</div><div>Auth token: rb0xch4ll3ng3</div><div> </div><div></div></div></div> </div>
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