[NT] Microsoft Office GIF Filter Buffer Overflow (MS06-039)

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Microsoft Office GIF Filter Buffer Overflow (MS06-039)
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SUMMARY

A buffer overflow vulnerability in Microsoft Office GIF filter allows
attackers to run arbitrary code via a carefully crafted GIF image.

DETAILS

Vulnerable Systems:
* Microsoft Office 2000
* Microsoft Office XP
* Microsoft Office 2003

GIFIMP32.FLT is a GIF image filter shipped with Microsoft Office, which is
installed by default in %CommonProgramFiles%\Microsoft
Shared\Grphflt\GIFIMP32.FLT.

GIFIMP32.FLT contains a buffer overflow vulnerability in the handling of
some malformed GIF images, which allows attackers to run arbitrary code.
Any application that calls GIFIMP32.FLT is affected by this vulnerability.
For example, mspaint.exe will call the filter automatically when opening
files in .gif format, if Microsoft Office is installed. Attackers could
gain control over a system by alluring users to open a malicious GIF
image.

Workaround:
1. Do not open any GIF image from untrusted sources.
2. Temporarily remove GIFIMP32.FLT.

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0007>
CVE-2006-0007

Disclosure Timeline:
2005.05.27 Informed the vendor
2005.06.02 Vendor confirmed the vulnerability
2006.07.11 Microsoft has released a security bulletin (MS06-039) and
related patches.


ADDITIONAL INFORMATION

The information has been provided by <mailto:security@xxxxxxxxxxx>
NSFOCUS Security Team.
The original article can be found at:
<http://www.nsfocus.com/english/homepage/research/0604.htm>
http://www.nsfocus.com/english/homepage/research/0604.htm



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