CVE-2006-6696 Use after free in n/a

What is CVE-2006-6696?

CVE-2006-6696 is a medium-severity use after free vulnerability in Microsoft Windows 2000, published on 22 Dec 2006. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Double free vulnerability in Microsoft Windows 2000, XP, 2003, and Vista allows local users to gain privileges by calling the MessageBox function with a MB_SERVICE_NOTIFICATION message with crafted data, which sends a HardError message to Client/Server Runtime Server Subsystem (CSRSS) process, which is not properly handled when invoking the UserHardError and GetHardErrorText functions in WINSRV.DLL.

Weakness: CWE-119

Which versions are affected by CVE-2006-6696?

It affects 4 products.

Products include Microsoft Windows 2000, Microsoft Windows 2003 Server, Microsoft Windows Vista, Microsoft Windows Xp.

How do I fix CVE-2006-6696?

No fix has been published for CVE-2006-6696 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2006-6696 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-6696 exists.

Public exploit code: 2 Exploit-DB entries.

Other vulnerabilities in Microsoft Windows 2000

• CVE-2008-4250 Microsoft Windows Buffer Overflow Exploited Critical 9.8
• CVE-2010-0232 Microsoft Windows Kernel Exception Handler Exploited High 7.8
• CVE-2009-1123 Microsoft Windows Improper Input Validation Exploited High 7.8
• CVE-2002-0367 Microsoft Windows Privilege Escalation Exploited High 7.8
• CVE-2010-0269 Memory corruption in n/a Critical 10.0

All Microsoft Windows 2000 vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-fmp2-4wcx-jwx4.