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<h1><a href="/">Knapsy’s brain dump</a></h1>
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<h1 class="entry-title"><a href="/blog/2018/08/05/filevault-ctf-challenge-elf-x64-buffer-overflow/">FileVault CTF Challenge - ELF X64 Buffer Overflow</a></h1>
<p class="meta">
<time class='entry-date' datetime='2018-08-05T16:31:31+10:00'><span class='date'><span class='date-month'>Aug</span> <span class='date-day'>5</span><span class='date-suffix'>th</span>, <span class='date-year'>2018</span></span> <span class='time'>4:31 pm</span></time>
| <a href="/blog/2018/08/05/filevault-ctf-challenge-elf-x64-buffer-overflow/#disqus_thread"
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<div class="entry-content"><p>It’s been quite a while since I have done a CTF, but just very recently I got a chance to participate in one and came across a pretty interesting challenge which forced me to go back and re-learn exploit dev in Unix environments. Also had to brush up on my <code>gdb</code> knowledge…</p>
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<h1 class="entry-title"><a href="/blog/2017/05/01/quickzip-4-dot-60-win7-x64-seh-overflow-egghunter-with-custom-encoder/">QuickZip 4.60 - Win7 X64 SEH Overflow (Egghunter) With Custom Encoder</a></h1>
<p class="meta">
<time class='entry-date' datetime='2017-05-01T21:31:30+10:00'><span class='date'><span class='date-month'>May</span> <span class='date-day'>1</span><span class='date-suffix'>st</span>, <span class='date-year'>2017</span></span> <span class='time'>9:31 pm</span></time>
| <a href="/blog/2017/05/01/quickzip-4-dot-60-win7-x64-seh-overflow-egghunter-with-custom-encoder/#disqus_thread"
data-disqus-identifier="http://blog.knapsy.com/blog/2017/05/01/quickzip-4-dot-60-win7-x64-seh-overflow-egghunter-with-custom-encoder/">Comments</a>
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<div class="entry-content"><p>As a part of my preparations for the <a href="https://www.offensive-security.com/information-security-certifications/osce-offensive-security-certified-expert/">OSCE</a> exam, I have been trying to find some interesting exploits and PoC code to practice my skills on and learn something new in the exploit development department.</p>
<p>After some digging, I stumbled across a <a href="https://www.exploit-db.com/exploits/11656/">QuickZip v4.60 Buffer Overflow exploit</a>, which is very well documented by <a href="https://twitter.com/corelanc0d3r">corelanc0d3r</a> in a thorough blog post <a href="https://www.corelan.be/index.php/2010/03/27/quickzip-stack-bof-0day-a-box-of-chocolates/">here</a>.</p>
<p>Since the exploit itself is from 2010, it was designed to work on 32-bit Windows XP only. I decided to try and see if I can recreate it on a 64-bit Windows 7 and damn, was that a (fun) challenge!</p>
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<a rel="full-article" href="/blog/2017/05/01/quickzip-4-dot-60-win7-x64-seh-overflow-egghunter-with-custom-encoder/">Read on →</a>
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<h1 class="entry-title"><a href="/blog/2016/02/24/escape-from-shellcatraz-breaking-out-of-restricted-unix-shells-sectalks-melbourne-0x01-2016/">Escape From SHELLcatraz - Breaking Out of Restricted Unix Shells (SecTalks Melbourne 0x01 2016)</a></h1>
<p class="meta">
<time class='entry-date' datetime='2016-02-24T20:56:28+11:00'><span class='date'><span class='date-month'>Feb</span> <span class='date-day'>24</span><span class='date-suffix'>th</span>, <span class='date-year'>2016</span></span> <span class='time'>8:56 pm</span></time>
| <a href="/blog/2016/02/24/escape-from-shellcatraz-breaking-out-of-restricted-unix-shells-sectalks-melbourne-0x01-2016/#disqus_thread"
data-disqus-identifier="http://blog.knapsy.com/blog/2016/02/24/escape-from-shellcatraz-breaking-out-of-restricted-unix-shells-sectalks-melbourne-0x01-2016/">Comments</a>
</p>
</header>
<div class="entry-content"><p>Today I had a pleasure of presenting at one of the first <a href="http://www.sectalks.org/melbourne/">SecTalks Melbourne</a> sessions - if you’re from Melbourne, Australia area and into IT security / geeky stuff, make sure to sign up!</p>
<p>The talked covered basic methodology as well as some tips and tricks on breaking out of restricted Unix shells (such as <code>rbash</code> and <code>rksh</code>) that I came across during several CTFs and also at the “real life” engagements.</p>
<p>The slides from my talk are available at <a href="https://speakerdeck.com/knaps/escape-from-shellcatraz-breaking-out-of-restricted-unix-shells">SpeakerDeck here</a>.</p>
<p>Enjoy! :)</p>
</div>
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<article>
<header>
<h1 class="entry-title"><a href="/blog/2015/11/25/easy-file-sharing-web-server-v7-dot-2-remote-seh-buffer-overflow-dep-bypass-with-rop/">Easy File Sharing Web Server v7.2 - Remote SEH Buffer Overflow (DEP Bypass With ROP)</a></h1>
<p class="meta">
<time class='entry-date' datetime='2015-11-25T20:46:41+11:00'><span class='date'><span class='date-month'>Nov</span> <span class='date-day'>25</span><span class='date-suffix'>th</span>, <span class='date-year'>2015</span></span> <span class='time'>8:46 pm</span></time>
| <a href="/blog/2015/11/25/easy-file-sharing-web-server-v7-dot-2-remote-seh-buffer-overflow-dep-bypass-with-rop/#disqus_thread"
data-disqus-identifier="http://blog.knapsy.com/blog/2015/11/25/easy-file-sharing-web-server-v7-dot-2-remote-seh-buffer-overflow-dep-bypass-with-rop/">Comments</a>
</p>
</header>
<div class="entry-content"><p>Just a few weeks ago I attended an amazing training on exploit development on Windows - <a href="https://www.corelan-training.com/index.php/training-2/bootcamp/">Corelan Bootcamp</a>. I have to admit, it’s probably the best instructor led course I have ever attended; massive props to Peter “<a href="https://twitter.com/corelanc0d3r">corelanc0d3r</a>” who is a fantastic teacher and to OJ “<a href="https://twitter.com/TheColonial">TheColonial</a>” for organising it.</p>
<p>Okay, with credits out of the way, let’s talk exploits! Since everything I learned at the bootcamp is still fresh in my head, I thought it will be good to practice it a bit more and make sure all of the information sinks in properly.</p>
<p>So, off I went to <a href="https://exploit-db.com">exploit-db</a> and, after some poking around in DoS and PoC section, I found an exploit that I thought of redesigning and improving - <a href="https://www.exploit-db.com/exploits/38526/">Easy File Sharing Web Server 7.2 - Remote SEH Based Overflow</a>.</p>
</div>
<footer>
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<h1 class="entry-title"><a href="/blog/2015/03/29/oscp-thoughts-and-tips/">OSCP - Thoughts and Tips</a></h1>
<p class="meta">
<time class='entry-date' datetime='2015-03-29T18:18:03+11:00'><span class='date'><span class='date-month'>Mar</span> <span class='date-day'>29</span><span class='date-suffix'>th</span>, <span class='date-year'>2015</span></span> <span class='time'>6:18 pm</span></time>
| <a href="/blog/2015/03/29/oscp-thoughts-and-tips/#disqus_thread"
data-disqus-identifier="http://blog.knapsy.com/blog/2015/03/29/oscp-thoughts-and-tips/">Comments</a>
</p>
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<div class="entry-content"><p>I’ve been pretty quiet on here for the last couple months as I’ve been really busy taking <a href="https://www.offensive-security.com/information-security-training/penetration-testing-with-kali-linux/">Penetration testing with Kali Linux (PWK)</a> training course, followed by the <a href="https://www.offensive-security.com/information-security-certifications/oscp-offensive-security-certified-professional/">Offensive Security Certified Professional (OSCP)</a> exam.</p>
<p>You’ll find tons of other blog posts and reviews about the course and exam itself, so I won’t be repeating what you should be able to find elsewhere, instead, I’ll just try to give you a brief overview of what it is, how did I find it and some simple tips and tricks that will help you prepare for it.</p>
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<a rel="full-article" href="/blog/2015/03/29/oscp-thoughts-and-tips/">Read on →</a>
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<h1 class="entry-title"><a href="/blog/2014/12/16/pegasus-has-arrived-my-first-boot2root-vm/">Pegasus Has Arrived - My First Boot2root VM</a></h1>
<p class="meta">
<time class='entry-date' datetime='2014-12-16T21:54:34+11:00'><span class='date'><span class='date-month'>Dec</span> <span class='date-day'>16</span><span class='date-suffix'>th</span>, <span class='date-year'>2014</span></span> <span class='time'>9:54 pm</span></time>
| <a href="/blog/2014/12/16/pegasus-has-arrived-my-first-boot2root-vm/#disqus_thread"
data-disqus-identifier="http://blog.knapsy.com/blog/2014/12/16/pegasus-has-arrived-my-first-boot2root-vm/">Comments</a>
</p>
</header>
<div class="entry-content"><p>It’s here! My first boot2root VM, inspired by various CTFs I attended this year and couple cool things I learnt, is finally here! Go and grab it from <a href="https://www.vulnhub.com/entry/pegasus-1,109/">here (via VulnHub)</a>.</p>
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<a rel="full-article" href="/blog/2014/12/16/pegasus-has-arrived-my-first-boot2root-vm/">Read on →</a>
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<header>
<h1 class="entry-title"><a href="/blog/2014/11/17/png-from-hell-ruxcon-ctf-challenge/">PNG From Hell - Ruxcon CTF Challenge</a></h1>
<p class="meta">
<time class='entry-date' datetime='2014-11-17T11:43:20+11:00'><span class='date'><span class='date-month'>Nov</span> <span class='date-day'>17</span><span class='date-suffix'>th</span>, <span class='date-year'>2014</span></span> <span class='time'>11:43 am</span></time>
| <a href="/blog/2014/11/17/png-from-hell-ruxcon-ctf-challenge/#disqus_thread"
data-disqus-identifier="http://blog.knapsy.com/blog/2014/11/17/png-from-hell-ruxcon-ctf-challenge/">Comments</a>
</p>
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<div class="entry-content"><p>Some time ago now I was lucky enough to take part in <a href="https://ruxcon.org.au/events/ctf/">Ruxcon CTF</a>, which was absolutely awesome - learnt bunch of new things and met heaps of cool people!</p>
<p>There was a wide variety of different challenges, but this particular one REALLY did my head in. I spent way too much time on it during the CTF and unfortunately didn’t manage to break it. Then recently, I decided to take a look at it again and, with a lot less hassle than I thought, I nailed it!</p>
<p>Let me introduce you to my most hated PNG of all times…</p>
</div>
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<header>
<h1 class="entry-title"><a href="/blog/2014/11/05/kvasir-vm-writeup/">Kvasir VM Writeup</a></h1>
<p class="meta">
<time class='entry-date' datetime='2014-11-05T19:30:38+11:00'><span class='date'><span class='date-month'>Nov</span> <span class='date-day'>5</span><span class='date-suffix'>th</span>, <span class='date-year'>2014</span></span> <span class='time'>7:30 pm</span></time>
| <a href="/blog/2014/11/05/kvasir-vm-writeup/#disqus_thread"
data-disqus-identifier="http://blog.knapsy.com/blog/2014/11/05/kvasir-vm-writeup/">Comments</a>
</p>
</header>
<div class="entry-content"><p>It sort of became the main theme of this blog… yet another writeup for a VM from <a href="http://vulnhub.com">VulnHub</a> and, I have to admit, probably the most demanding one yet!</p>
<p><a href="http://vulnhub.com/entry/kvasir-i,106/">Kvasir</a> touches on quite a lot of aspects of security/pentesting and really tests your patience. <a href="https://twitter.com/_RastaMouse">Rasta Mouse</a> did a great job putting it all together and simulating a network of quite some depth by using Linux containers.</p>
<p>So, without delying too much, let’s get right into it as there’s A LOT to go through!</p>
</div>
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<a rel="full-article" href="/blog/2014/11/05/kvasir-vm-writeup/">Read on →</a>
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<header>
<h1 class="entry-title"><a href="/blog/2014/10/28/beating-the-troll-tr0ll2-writeup/">Beating the Troll - Tr0ll2 Writeup</a></h1>
<p class="meta">
<time class='entry-date' datetime='2014-10-28T19:57:51+11:00'><span class='date'><span class='date-month'>Oct</span> <span class='date-day'>28</span><span class='date-suffix'>th</span>, <span class='date-year'>2014</span></span> <span class='time'>7:57 pm</span></time>
| <a href="/blog/2014/10/28/beating-the-troll-tr0ll2-writeup/#disqus_thread"
data-disqus-identifier="http://blog.knapsy.com/blog/2014/10/28/beating-the-troll-tr0ll2-writeup/">Comments</a>
</p>
</header>
<div class="entry-content"><p>Damn, I love <a href="http://www.vulnhub.com">VulnHub</a> - always keeps me entertained! With so many VMs released recently and with me just coming off an awesome CTF I have been kept quite busy those last couple weeks! Keeping the momentum up, I decided to give <a href="http://vulnhub.com/entry/tr0ll-2,107/">Tr0ll2 VM</a> a shot. As expected, there were trolls on the way, but overall I quite enjoyed it! Alright, let’s rock on.</p>
</div>
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<a rel="full-article" href="/blog/2014/10/28/beating-the-troll-tr0ll2-writeup/">Read on →</a>
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<h1 class="entry-title"><a href="/blog/2014/10/16/knock-knock-vm-walkthrough/">Knock-Knock VM Walkthrough</a></h1>
<p class="meta">
<time class='entry-date' datetime='2014-10-16T15:29:15+11:00'><span class='date'><span class='date-month'>Oct</span> <span class='date-day'>16</span><span class='date-suffix'>th</span>, <span class='date-year'>2014</span></span> <span class='time'>3:29 pm</span></time>
| <a href="/blog/2014/10/16/knock-knock-vm-walkthrough/#disqus_thread"
data-disqus-identifier="http://blog.knapsy.com/blog/2014/10/16/knock-knock-vm-walkthrough/">Comments</a>
</p>
</header>
<div class="entry-content"><p>Just after awesome weekend hacking away at <a href="http://ruxcon.org.au">Ruxcon</a>, <a href="http://vulnhub.com">VulnHub</a> delivered yet another boot2root VM - wow, that’s been busy (and fun) last couple of weeks! Good practice for another big CTF that is coming up for me very soon…</p>
<p>Anyway, without too much of an intro, let’s get to it!</p>
</div>
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<a rel="full-article" href="/blog/2014/10/16/knock-knock-vm-walkthrough/">Read on →</a>
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<section>
<h1>About Me</h1>
<p><img src="https://pbs.twimg.com/profile_images/1026331713549389824/sxjd08KY_bigger.jpg" align="right"/><strong>Knapsy</strong> (<u><a href="http://twitter.com/TheKnapsy">@TheKnapsy</a></u>)<br/>
IT security guy, pentester, coder, basketballer, coffee enthusiast. Creative, bit nuts, sleep deprived.</p>
</section>
<section>
<h1>Recent Posts</h1>
<ul id="recent_posts">
<li class="post">
<a href="/blog/2018/08/05/filevault-ctf-challenge-elf-x64-buffer-overflow/">FileVault CTF Challenge - ELF X64 Buffer Overflow</a>
</li>
<li class="post">
<a href="/blog/2017/05/01/quickzip-4-dot-60-win7-x64-seh-overflow-egghunter-with-custom-encoder/">QuickZip 4.60 - Win7 X64 SEH Overflow (Egghunter) With Custom Encoder</a>
</li>
<li class="post">
<a href="/blog/2016/02/24/escape-from-shellcatraz-breaking-out-of-restricted-unix-shells-sectalks-melbourne-0x01-2016/">Escape From SHELLcatraz - Breaking Out of Restricted Unix Shells (SecTalks Melbourne 0x01 2016)</a>
</li>
<li class="post">
<a href="/blog/2015/11/25/easy-file-sharing-web-server-v7-dot-2-remote-seh-buffer-overflow-dep-bypass-with-rop/">Easy File Sharing Web Server v7.2 - Remote SEH Buffer Overflow (DEP Bypass With ROP)</a>
</li>
<li class="post">
<a href="/blog/2015/03/29/oscp-thoughts-and-tips/">OSCP - Thoughts and Tips</a>
</li>
</ul>
</section>
<section>
<h1>Latest Tweets</h1>
<p><a class="twitter-timeline" href="https://twitter.com/TheKnapsy" data-widget-id="517677537711767552">Tweets by @TheKnapsy</a></p>
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