Topic: Microsoft Office GIF Filter Buffer Overflow Vulnerability

Release Date: 2006-07-12

CVE CAN ID : CVE-2006-0007

Affected system:
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-Microsoft Office 2000
-Microsoft Office XP
-Microsoft Office 2003

Unaffected system:
==============

Impact:
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NSFocus Security Team discovered a buffer overflow vulnerability in Microsoft Office GIF filter, which could allow attackers to run arbitrary code via a carefully crafted GIF image.

Description:
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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.

Vendor Status:
============
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.

For more details about the security bulletin, please refer to:
http://www.microsoft.com/technet/security/bulletin/MS06-039.mspx

Additional Information:
==================
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2006-0007 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. Candidates may change significantly before they become official CVE entries.

Credit:
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Yu Yang of NSFocus Security Team found the vulnerability.