Recognize-Security

Posted by Trancer on Jul 06 2009

The CSIS Security Group found (credit correction – see the update below) a 0day exploit in-the-wild that exploit a vulnerability within Microsoft DirectShow (msvidctl.dll) in the way it handles MPEG-2 files.
The exploit found is used to preform drive-by attacks via compromised Chinese web sites.
Original exploit (as it is in-the-wild) can be found here (shellcode changed to execute calc.exe) – aa.rar.
You can read the translated post here or read this post from ISC diary.

Here’s a Metasploit exploit module I wrote that exploit this vulnerability.
Tested successfully on the following platforms (fully patched 06/07/09):
– Internet Explorer 6, Windows XP SP2
– Internet Explorer 7, Windows XP SP3

Download msvidctl_mpeg2.rb.
Also on Metasploit.

Also, if you want to test this vulnerability manually, here’s a little Ruby script I wrote that build GIF files to trigger the vulnerability:
Download msvidctl_gif.rb.

This is the second exploit found in-the-wild in the past month that exploit a vulnerability in Microsoft DirectShow. In June, an exploit was found in-the-wild that exploit a vulnerability in DirectShow QuickTime Movie Parser Filter (quartz.dll). Liam O Murchu of Symantec wrote an analysis for this exploit here:
DirectShow Exploit In the Wild
DirectShow Exploit In the Wild, Part II

This post will update with additional updates about this vulnerability.

Updates:

>> It seems that CSIS Security Group wasn’t the first to discover this exploit in-the-wild, KingSoft from China was the first to spot this exploit – KingSoft blog (translated).
Thank to Carsten Eiram for pointing it out.

>> References:
CVE-2008-0015
OSVDB 55651
BID 35558
Microsoft Security Advisory (972890)
SA35683

>> Blog posts and news:
Microsoft Security Research & Defense blog
ZDNet Zero Day blog
Symantec Connect blog

>> SANS ISC Handler’s Diary have posted a blog post that will update frequently with list of domains that is actively exploiting this vulnerability. Note that the vast majority of the domains is up for only a short period of time – IE 0day exploit domains (updating).

>> As the CVE number implies (early 2008), it turns out that Microsoft was aware of this vulnerability for a long time. In the security advisory, Microsoft thanks Ryan Smith and Alex Wheeler of Hustle Labs of ISS X-Force for initially reporting this vulnerability. Well, I guess that’s what happens when you wait too long to patch a vulnerability, eventually someone else will discover it and wont chose the path of responsible disclosure.

>> Guido Landi details the vulnerability in his blog – PornoSecurity.

>> In their security advisory, Microsoft recommends setting the kill bit for 44 classid’s. With some of them it is possible to reproduce the bug. Check out I)ruid’s update for the Metasploit exploit.

>> Microsoft Video ActiveX control 0day technical details blog post by TippingPoint DVLabs.

>> Interesting post regarding this vulnerability by Halvar Flake – Poking around MSVIDCTL.DLL.

>> Microsoft fix the msvidctl.dll memory corruption vulnerability in MS09-032. The “patch” does NOT fix the vulnerability, only setting a kill bit to all the vulnerable Video ActiveX controls.

>> Microsoft fix the source of the msvidctl.dll memory corruption vulnerability in MS09-037.

Categories: Exploits • Metasploit

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