Windows CSRSS Write Up: Inter-process Communication (part 2/3)
A quick beginning note: My friend d0c_s4vage has created a technical blog and posted his first text just a few days ago. The post entry covers a recent, critical libpng vulnerability discovered by this guy; the interesting thing is that, among others, the latest Firefox and Chrome versions were vulnerable. Feel free to take a minute and read the article here.
Additionally, the video and mp3 recordings from the presentation performed by me and Gynvael on the CONFidence 2010 conference, are now publicly available on the official website: link (Case study of recent Windows vulnerabilities).
Windows CSRSS Write Up: Inter-process Communication (part 1/3)
In the second post of the Windows CSRSS Write Up series, I would like to explain how the practical communication between the Windows Subsystem and user's process takes place under the hood. Due to the fact that some major improvements have been introduced in Windows Vista and later, the entire article is split into two parts - the first one giving an insight at what the communication channel really is, as well as how is it taken advantage of by both CSRSS and a user processes. The second one, on the other hand, is going to talk through the modifications and new features shipped with the Windows systems starting from Vista, as most of the basic ideas remain the same for decades. As you already know what to expect, proceed to the next section 
Windows CSRSS Write Up: the basics (part 1/1)
NOTE: The following post entry opens a series of CSRSS-oriented articles, aiming at describing the uncovered CSRSS mechanism internals, present in the Windows OS for more than fifteen years now. Although some great research has already been carried out by a few curious guys (check out the references), no thorough case study is available until now. In this series, I am going to cover both the very basic ideas and their implementations, as well as the recent CSRSS changes applied in modern operating systems (i.e. Windows 7). And so, just have a good read! 
CONFidence 2010 is over
One of the biggest (best ) IT security-oriented conferences in Poland finished three days ago, in the wednesday evening. In the very first place, I would like to congratulate all the organisers, for their decision on where the event should be held, as well as how it should look like - during these two days, I had plenty of real fun!
Windows CSRSS cross-version API Table
Hello!
It seems like half a year has passed since I published the Win32k.SYS system call table list on the net. During this time (well, it didn't take so long ) I managed to gather enough information to release yet another API list - this time, concerning an user-mode application - CSRSS (Client/Server Runtime SubSystem). As a relatively common research subject, I think a table of this kind can make things easier for lots of people.
Windows Kernel Vulnerabilities continued – details
And so it happened ;> As I've written in this post, Gynvael Coldwind has just finished speaking about recent Windows Kernel Vulnerabilities on the Hack In The Box Dubai conference, taking place today. Unfortunately, because of the European air communication being disabled these days, the presentation was held remotely - one way or another, it can be considered very successful, imho.
Thanks to the organisers, who publish the materials right after the speeches are over, all of the slides are now available at http://conference.hitb.org/hitbsecconf2010dxb/materials/.
Our presentation, containing the details of how the aforementioned kernel / CSRSS vulns work and can be exploited, can be found here (1.27MB).
I am not going to spoil anything more here - if you were not lucky to attend the Dubai conference, I strongly recommend the polish CONFidence 2010 held in May (which I also mentioned already).
Have fun!
Controlling Windows process list, part 1
First of all, I would like to point out that my old bootkit presentation related stuff is available since a few weeks now. As the whole event was held in polish language, so are the slides / materials. One way or another, if some of you were interested, just take a look at the Slow kilka o SecDay 2k9 post entry.
In one of my previous posts (check Suspending processes in Windows, part 1), I was trying to discuss the well-known and less popular techniques making it possible to suspend threads or entire processes working under Microsoft Windows OS control. I also announced that a specific way of TaskMgr.exe modification - extending it with the interesting functionality - would be described in the next post. Although, before getting straight to the point (this is - changing the executable binary code), we have to consider some other important matters. Namely, we intend to have the modification applied to every single Task Manager instance running on the system. Right here, we have a few possible paths to go:
Process termination issues
1. Introduction
The first technical post here is about the process of terminating applications on Windows system. I have been researching this subject for the last few days, during which a number of interesting (yet unknown) facts has appeared. Some of the solution ideas regarding particular problems are presented here, though I am sure there are many nice ways of dealing with those - feel free to post your ideas below ;>
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- Windows CSRSS Write Up: Inter-process Communication (part 2/3)
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- Windows CSRSS Write Up: Inter-process Communication (part 1/3)
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Recent Comments
- j00ru: @NCR: Mmm… you should know it, already?;D
- NCR: @j00ru: what could it be?
- j00ru: @frank boldewin: thanks mate @NCR: Ahaha, yeah ;D I’ve got something for ya btw.
- NCR: Hey!, you did it!, you wrote it! thanks!
- frank boldewin: excellent writeup dude!