Root Cause Analysis – Memory Corruption Vulnerabilities
Introduction For the past year or so I’ve spent a significant amount of time fuzzing various applications with the hopes of identifying exploitable crashes. Early on in my research I quickly realized that building fuzzers and generating large quantities of crashes, even for heavily targeted applications, was easy. However, determining the exploitability of these crashes, [...]
DEPS – Precise Heap Spray on Firefox and IE10
Introduction Last week, while doing my bi-weekly courseware review and update, I discovered that my heap spray script for Firefox 9 no longer works on recent versions. Looking back at the type of tricks I had to use to make a precise spray work under Firefox 9 and IE 9, and realizing that these changes [...]
Heap Layout Visualization with mona.py and WinDBG
Introduction Time flies. Almost 3 weeks have passed since we announced the ability to run mona.py under WinDBG. A lot of work has been done on mona.py in the meantime. We improved stability and performance, updated to pykd.pyd 0.2.0.14 and ported a few additional immlib methods to windbglib. I figured this would be a good [...]
Jingle BOFs, Jingle ROPs, Sploiting all the things… with Mona v2 !!
Ho Ho Ho friends, It has been a while since we posted something on the Corelan Team blog, I guess we all have been busy doing … stuff and things, here and there. Nevertheless, as the year is close to filling up 100%, it’s probably a good time to start thinking about finding some convincing [...]
Happy New Year – here’s my special gift to you, corelanc0d3r
I’m not going to spend a lot of words on this. Facts speak for themselves. A short while ago, I discovered this: http://www.hackforums.net/showthread.php?tid=3031925 (you need to register to get access to the thread). Screenshot : idle-hands profile : Reputation I registered a useraccount "corelanc0d3r" and used the "Report" button, but for some reason my user [...]
Debugging Fun – Putting a process to sleep()
Recently I played with an older CVE (CVE-2008-0532, http://www.securityfocus.com/archive/1/489463, by FX) and I was having trouble debugging the CGI executable where the vulnerable function was located.
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Exploit writing tutorial part 11 : Heap Spraying Demystified
A lot has been said and written already about heap spraying, but most of the existing documentation and whitepapers focus on IE7 or older versions.
Although there are a number of public exploits available that target IE8, the exact technique to do so has not been really documented in detail.
Of course, you can probably derive how it works by looking at those public exploits.
With this tutorial, I’m going to provide you with a full and detailed overview on what heap spraying is, and how to use it on old and newer platforms.
I’ll start with some “ancient” techniques (or classic techniques if you will) that can be used on IE6 and IE7.
We’ll also look at heap spraying for non-browser applications.
Next, we’ll talk about precision heap spraying, which is a requirement to make DEP bypass exploits work on IE8.
I’ll finish this tutorial with sharing some of my own research on getting reliable heap spraying to work on IE9.
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WoW64 Egghunter
Traditional Egghunter An Egghunter is nothing more than an assembly routine to find shellcode somewhere in memory. We typically deploy an Egghunter when there is no more room in our buffer that we can use to initially redirect EIP to. If we are able to load our shellcode elsewhere in process memory, the Egghunter will [...]
mona.py – the manual
This document describes the various commands, functionality and behaviour of mona.py.
Released on june 16, this pycommand for Immunity Debugger replaces pvefindaddr, solving performance issues and offering numerous new features. pvefindaddr will still be available for download until all of its functionality has been ported over to mona.
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Universal DEP/ASLR bypass with msvcr71.dll and mona.py
Over the last few weeks, there has been some commotion about a universal DEP/ASLR bypass routine using ROP gadgets from msvcr71.dll (written by Immunity Inc) and the fact that it might have been copied into an exploit submitted to Metasploit as part of the Metasploit bounty.
I’m not going to make any statements about this, but the ROP routine itself looks pretty slick.
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