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<h1><a href="./blog/2018/07/14/cve-2017-2446-or-jscjsglobalobjectishavingabadtime/">CVE-2017-2446 or JSC::JSGlobalObject::isHavingABadTime.</a></h1>
<div class="well small"><footer class="post-info">
<span class="label">Date</span>
<abbr class="published" title="2018-07-14T18:49:00-07:00">
<i class="icon-calendar"></i>Sat 14 July 2018
</abbr>
<span class="label">By</span>
<a href="./author/yrp.html"><i class="icon-user"></i>yrp</a>
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<a href="./category/exploitation.html"><i class="icon-folder-open"></i>exploitation</a>
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<a href="./tag/javascriptcore.html"><i class="icon-tag"></i>JavascriptCore</a>
<a href="./tag/jsc.html"><i class="icon-tag"></i>jsc</a>
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<div class="summary"><h1 id="introduction">Introduction</h1>
<p>This post will cover the development of an exploit for JavaScriptCore (JSC) from the perspective of someone with no background in browser exploitation.</p>
<p>Around the start of the year, I was pretty burnt out on CTF problems and was interested in writing an exploit for something more complicated and …</p>
<a class="btn primary xsmall" href="./blog/2018/07/14/cve-2017-2446-or-jscjsglobalobjectishavingabadtime/">more ...</a>
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<h1><a href="./blog/2018/05/17/breaking-ledgerctfs-aes-white-box-challenge/">Breaking ledgerctf's AES white-box challenge</a></h1>
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<span class="label">Date</span>
<abbr class="published" title="2018-05-17T11:52:00-07:00">
<i class="icon-calendar"></i>Thu 17 May 2018
</abbr>
<span class="label">By</span>
<a href="./author/axel-0vercl0k-souchet.html"><i class="icon-user"></i>Axel "0vercl0k" Souchet</a>
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<a href="./category/reverse-engineering.html"><i class="icon-folder-open"></i>reverse-engineering</a>
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<a href="./tag/reverse-engineering.html"><i class="icon-tag"></i>reverse-engineering</a>
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<div class="summary"><h1 id="introduction">Introduction</h1>
<p>About a month ago, my mate <a href="https://twitter.com/b0n0n">b0n0n</a> was working on the <a href="https://www.ledger.fr/ctf2018/">ledgerctf</a> puzzles and challenged me to have a look at the <em>ctf2</em> binary. I eventually did and this blogpost discusses the protection scheme and how I broke it. Before diving in though, here is a bit of background …</p>
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<h1><a href="./blog/2018/03/11/bevx-challenge-on-the-operation-table/">beVX challenge on the operation table</a></h1>
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<span class="label">Date</span>
<abbr class="published" title="2018-03-11T17:22:00-07:00">
<i class="icon-calendar"></i>Sun 11 March 2018
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<span class="label">By</span>
<a href="./author/axel-0vercl0k-souchet.html"><i class="icon-user"></i>Axel "0vercl0k" Souchet</a>
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<a href="./category/reverse-engineering.html"><i class="icon-folder-open"></i>reverse-engineering</a>
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<a href="./tag/reverse-engineering.html"><i class="icon-tag"></i>reverse-engineering</a>
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<div class="summary"><h1 id="introduction">Introduction</h1>
<p>About two weeks ago, my friend <a href="https://twitter.com/mongobug">mongo</a> challenged me to solve a reverse-engineering puzzle put up by the <a href="https://blogs.securiteam.com/">SSD</a> team for <a href="https://www.offensivecon.org/">OffensiveCon2018</a> (which is a security conference that took place in Berlin in February). The challenge binary is available for download <a href="https://www.beyondsecurity.com/bevxcon/bevx-challenge-1">here</a> and <a href="https://twitter.com/SecuriTeam_SSD/status/964459126960066560">here is one of the original …</a></p>
<a class="btn primary xsmall" href="./blog/2018/03/11/bevx-challenge-on-the-operation-table/">more ...</a>
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<h1><a href="./blog/2017/12/01/debugger-data-model/">Debugger data model, Javascript & x64 exception handling</a></h1>
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<span class="label">Date</span>
<abbr class="published" title="2017-12-01T06:59:00-08:00">
<i class="icon-calendar"></i>Fri 01 December 2017
</abbr>
<span class="label">By</span>
<a href="./author/axel-0vercl0k-souchet.html"><i class="icon-user"></i>Axel "0vercl0k" Souchet</a>
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<a href="./category/debugging.html"><i class="icon-folder-open"></i>debugging</a>
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<a href="./tag/debugging.html"><i class="icon-tag"></i>debugging</a>
<a href="./tag/javascript.html"><i class="icon-tag"></i>javascript</a>
<a href="./tag/windbg.html"><i class="icon-tag"></i>windbg</a>
<a href="./tag/exception-handling.html"><i class="icon-tag"></i>exception handling</a>
<a href="./tag/seh.html"><i class="icon-tag"></i>seh</a>
<a href="./tag/time-travel-debugging.html"><i class="icon-tag"></i>time-travel debugging</a>
<a href="./tag/ttd.html"><i class="icon-tag"></i>ttd</a>
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<div class="summary"><h1 id="introduction">Introduction</h1>
<p>The main goal of today's post is to show a bit more of what is now possible with the latest Windbg (currently branded <a href="https://blogs.windows.com/buildingapps/2017/08/28/new-windbg-available-preview/">"WinDbg Preview"</a> in the Microsoft store) and the time travel debugging tools that Microsoft released a few months ago. When these finally got released, a bit …</p>
<a class="btn primary xsmall" href="./blog/2017/12/01/debugger-data-model/">more ...</a>
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<h1><a href="./blog/2017/08/05/binary-rewriting-with-syzygy/">Binary rewriting with syzygy, Pt. I</a></h1>
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<span class="label">Date</span>
<abbr class="published" title="2017-08-05T16:08:00-07:00">
<i class="icon-calendar"></i>Sat 05 August 2017
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<span class="label">By</span>
<a href="./author/axel-0vercl0k-souchet.html"><i class="icon-user"></i>Axel "0vercl0k" Souchet</a>
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<a href="./tag/program-analysis.html"><i class="icon-tag"></i>program analysis</a>
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<div class="summary"><h1 id="introduction">Introduction</h1>
<p>Binary instrumentation and analysis have been subjects that I have always found fascinating. At compile time via <a href="http://doar-e.github.io/blog/2016/11/27/clang-and-passes/">clang</a>, or at runtime with dynamic binary instrumentation frameworks like <a href="https://software.intel.com/en-us/articles/pin-a-dynamic-binary-instrumentation-tool">Pin</a> or <a href="http://www.dynamorio.org/">DynamoRIO</a>. One thing I have always looked for though, is a framework able to statically instrument a PE image. A …</p>
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<h1><a href="./blog/2016/12/21/happy-unikernels/">happy unikernels</a></h1>
<div class="well small"><footer class="post-info">
<span class="label">Date</span>
<abbr class="published" title="2016-12-21T18:59:00-08:00">
<i class="icon-calendar"></i>Wed 21 December 2016
</abbr>
<span class="label">By</span>
<a href="./author/yrp.html"><i class="icon-user"></i>yrp</a>
<span class="label">Category</span>
<a href="./category/exploitation.html"><i class="icon-folder-open"></i>exploitation</a>
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<a href="./tag/unikernel.html"><i class="icon-tag"></i>unikernel</a>
<a href="./tag/rumpkernel.html"><i class="icon-tag"></i>rumpkernel</a>
<a href="./tag/exploitation.html"><i class="icon-tag"></i>exploitation</a>
</footer><!-- /.post-info --></div>
<div class="summary"><h1 id="intro">Intro</h1>
<p>Below is a collection of notes regarding unikernels. I had originally prepared this stuff to submit to EkoParty’s CFP, but ended up not wanting to devote time to stabilizing PHP7’s heap structures and I lost interest in the rest of the project before it was complete. However …</p>
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<h1><a href="./blog/2016/11/27/clang-and-passes/">Token capture via an llvm-based analysis pass</a></h1>
<div class="well small"><footer class="post-info">
<span class="label">Date</span>
<abbr class="published" title="2016-11-27T20:43:00-08:00">
<i class="icon-calendar"></i>Sun 27 November 2016
</abbr>
<span class="label">By</span>
<a href="./author/axel-0vercl0k-souchet.html"><i class="icon-user"></i>Axel "0vercl0k" Souchet</a>
<span class="label">Category</span>
<a href="./category/misc.html"><i class="icon-folder-open"></i>misc</a>
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<a href="./tag/fuzzing.html"><i class="icon-tag"></i>fuzzing</a>
<a href="./tag/clang.html"><i class="icon-tag"></i>clang</a>
<a href="./tag/llvm.html"><i class="icon-tag"></i>llvm</a>
<a href="./tag/analysis-pass.html"><i class="icon-tag"></i>analysis pass</a>
<a href="./tag/pass.html"><i class="icon-tag"></i>pass</a>
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<div class="summary"><h1 id="introduction">Introduction</h1>
<p>About three years ago, the LLVM framework started to pique my interest for a lot of different reasons. This collection of industrial strength compiler technology, as <a href="http://llvm.org/pubs/2008-10-04-ACAT-LLVM-Intro.pdf">Latner</a> said in 2008, was designed in a very modular way. It also looked like it had a lot of interesting features that …</p>
<a class="btn primary xsmall" href="./blog/2016/11/27/clang-and-passes/">more ...</a>
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<h1><a href="./blog/2015/08/18/keygenning-with-klee/">Keygenning with KLEE</a></h1>
<div class="well small"><footer class="post-info">
<span class="label">Date</span>
<abbr class="published" title="2015-08-18T22:12:00-07:00">
<i class="icon-calendar"></i>Tue 18 August 2015
</abbr>
<span class="label">By</span>
<a href="./author/michele-brt_device-bertasi.html"><i class="icon-user"></i>Michele "brt_device" Bertasi</a>
<span class="label">Category</span>
<a href="./category/reverse-engineering.html"><i class="icon-folder-open"></i>reverse-engineering</a>
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<a href="./tag/reverse-engineering.html"><i class="icon-tag"></i>reverse-engineering</a>
<a href="./tag/symbolic-execution.html"><i class="icon-tag"></i>symbolic execution</a>
</footer><!-- /.post-info --></div>
<div class="summary"><h1 id="introduction">Introduction</h1>
<p>In the past weeks I enjoyed working on reversing a piece of software (don't ask me the name), to study how serial numbers are validated. The story the user has to follow is pretty common: download the trial, pay, get the serial number, use it in the annoying nag …</p>
<a class="btn primary xsmall" href="./blog/2015/08/18/keygenning-with-klee/">more ...</a>
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<h1><a href="./blog/2015/02/08/spotlight-on-an-unprotected-aes128-whitebox-implementation/">Spotlight on an unprotected AES128 white-box implementation</a></h1>
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<span class="label">Date</span>
<abbr class="published" title="2015-02-08T22:59:00-08:00">
<i class="icon-calendar"></i>Sun 08 February 2015
</abbr>
<span class="label">By</span>
<a href="./author/axel-0vercl0k-souchet.html"><i class="icon-user"></i>Axel "0vercl0k" Souchet</a>
<span class="label">Category</span>
<a href="./category/obfuscation.html"><i class="icon-folder-open"></i>obfuscation</a>
<span class="label">Tags</span>
<a href="./tag/obfuscation.html"><i class="icon-tag"></i>obfuscation</a>
<a href="./tag/white-box.html"><i class="icon-tag"></i>white-box</a>
<a href="./tag/practical-cryptography.html"><i class="icon-tag"></i>practical cryptography</a>
<a href="./tag/aes128.html"><i class="icon-tag"></i>aes128</a>
<a href="./tag/encryption.html"><i class="icon-tag"></i>encryption</a>
</footer><!-- /.post-info --></div>
<div class="summary"><h1 id="introduction">Introduction</h1>
<p>I think it all began when I've worked on the <a href="https://github.com/0vercl0k/stuffz/tree/master/NoSuchCon2013">NSC2013</a> crackme made by <a href="https://twitter.com/elvanderb">@elvanderb</a>, long story short you had an AES128 heavily obfuscated white-box implementation to break. The thing was you could actually solve the challenge in different ways: </p>
<ol>
<li>the first one was the easiest one: you didn't …</li></ol>
<a class="btn primary xsmall" href="./blog/2015/02/08/spotlight-on-an-unprotected-aes128-whitebox-implementation/">more ...</a>
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<h1><a href="./blog/2014/10/11/taiming-a-wild-nanomite-protected-mips-binary-with-symbolic-execution-no-such-crackme/">Taming a wild nanomite-protected MIPS binary with symbolic execution: No Such Crackme</a></h1>
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<span class="label">Date</span>
<abbr class="published" title="2014-10-11T21:35:00-07:00">
<i class="icon-calendar"></i>Sat 11 October 2014
</abbr>
<span class="label">By</span>
<a href="./author/axel-0vercl0k-souchet-emilien-tr4nce-girault.html"><i class="icon-user"></i>Axel "0vercl0k" Souchet & Emilien "tr4nce" Girault</a>
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<a href="./category/reverse-engineering.html"><i class="icon-folder-open"></i>reverse-engineering</a>
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<a href="./tag/reverse-engineering.html"><i class="icon-tag"></i>reverse-engineering</a>
<a href="./tag/z3py.html"><i class="icon-tag"></i>z3py</a>
<a href="./tag/z3.html"><i class="icon-tag"></i>z3</a>
<a href="./tag/symbolic-execution.html"><i class="icon-tag"></i>symbolic execution</a>
<a href="./tag/mips.html"><i class="icon-tag"></i>MIPS</a>
<a href="./tag/nosuchcon.html"><i class="icon-tag"></i>NoSuchCon</a>
</footer><!-- /.post-info --></div>
<div class="summary"><p>As last year, the French conference <a href="http://www.nosuchcon.org/#challenge">No Such Con</a> returns for its second edition in Paris from the 19th of November until the 21th of November. And again, the brilliant <a href="https://twitter.com/elvanderb">Eloi Vanderbeken</a> & his mates at <a href="http://synacktiv.fr/en/index.html">Synacktiv</a> put together a series of three security challenges especially for this occasion.
Apparently, the …</p>
<a class="btn primary xsmall" href="./blog/2014/10/11/taiming-a-wild-nanomite-protected-mips-binary-with-symbolic-execution-no-such-crackme/">more ...</a>
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