What’s Vulnerable › Vulnerabilities

CVE-2006-6696

• Severity: medium (CVSS 6.9 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2006-12-22 · updated 2026-06-16
• Weakness: CWE-119

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.

Affected products

• Microsoft Windows 2000: all versions
• Microsoft Windows 2003 Server: datacenter_edition, datacenter_edition-sp1, datacenter_edition-sp1_beta_1, enterprise_edition-sp1, enterprise_edition-sp1_beta_1, sp1 (+6)
• Microsoft Windows Vista: all versions
• Microsoft Windows XP Service Pack 3: all versions

References

• http://blogs.technet.com/msrc/archive/2006/12/22/new-report-of-a-windows-vulnerability.aspx
• http://groups.google.ca/group/microsoft.public.win32.programmer.kernel/browse_thread/thread/c5946bf40f227058/7bd7b5d66a4e5aff
• http://isc.sans.org/diary.php?n&storyid=1965
• http://lists.grok.org.uk/pipermail/full-disclosure/2006-December/051394.html
• http://research.eeye.com/html/alerts/zeroday/20061215.html
• http://secunia.com/advisories/23448
• http://securitytracker.com/id?1017433
• http://www.determina.com/security.research/vulnerabilities/csrss-harderror.html
• http://www.kuban.ru/forum_new/forum2/files/19124.html
• http://www.security.nnov.ru/Gnews944.html
• http://www.security.nnov.ru/files/messagebox.c
• http://www.securityfocus.com/archive/1/455061/100/0/threaded

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