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Home arrow SecurityAlert Database

Arrow  Topic :

Windows Metafile Multiple Heap Overflows


Arrow  SecurityAlert : 161
Arrow  CVE : CVE-2005-2124
Arrow  SecurityRisk : High  Security Risk High  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : Yes
Arrow  Exploit Available : No
Arrow  Credit : Fang Xing
Arrow  Published : 09.11.2005

Arrow  Affected Software :
Windows NT Workstation
Windows NT Server
Windows NT Terminal Server
Windows 2000
Windows Server 2003



Arrow  Advisory Content :  

Overview:
eEye Digital Security has discovered a heap overflow vulnerability in the
way the Windows Graphical Device Interface (GDI) processes Windows enhanced
metafile images (file extensions EMF and WMF). An attacker could send a
malicious metafile to a victim of his choice over any of a variety of media
-- such as HTML e-mail, a link to a web page, a metafile-bearing Microsoft
Office document, or a chat message -- in order to execute code on that
user's system at the user's privilege level.

Technical Details:
The Windows metafile rendering code in GDI32.DLL contains a number of
integer overflow flaws in its processing of EMF/WMF file data that lead to
exploitable heap overflows through any number of specially crafted metafile
structures. For example, the following disassembly from
MRBP16::bCheckRecord demonstrates a size calculation that is susceptible to
integer overflow and as a result may pass validation with a dangerous
value:

77F6C759 mov edx, [ecx+18h] ; malicious count (e.g., 8000000Dh)
77F6C75C mov eax, [ecx+4] ; heap allocation size
...
77F6C764 lea edx, [edx*4+1Ch] ; EDX >= 3FFFFFF9h: integer overflow
77F6C76B cmp edx, eax ; validation check
77F6C76D jnz 77F6C77F

Protection:
Retina Network Security Scanner has been updated to identify this
vulnerability.
Blink - Endpoint Vulnerability Prevention - preemptively protects from this
vulnerability.

Vendor Status:
Microsoft has released a patch for this vulnerability. The patch is
available at:
http://www.microsoft.com/technet/security/bulletin/MS05-053.mspx

Credit:
Discovery: Fang Xing

Related Links:
Retina Network Security Scanner - Free Trial
Blink Endpoint Vulnerability Prevention - Free Trial
Retina Network Security Scanner - Japanese Edition-
http://www.sse.co.jp/eeye/index.html

Greetings:
Thanks Derek and and eEye guys helped me write this advisory. Greeting
xfocus guys and venustech lab guys.




Arrow  Feedback :

If you have additional information or notice any errors regarding this security advisory, please use contact form or email us at info()securityreason()com.
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