Vulnerability Description
The JIT compiler in Microsoft .NET Framework 3.5 Gold and SP1, 3.5.1, and 4.0, when IsJITOptimizerDisabled is false, does not properly handle expressions related to null strings, which allows context-dependent attackers to bypass intended access restrictions, and consequently execute arbitrary code, in opportunistic circumstances by leveraging a crafted application, as demonstrated by (1) a crafted XAML browser application (aka XBAP), (2) a crafted ASP.NET application, or (3) a crafted .NET Framework application, aka ".NET Framework JIT Optimization Vulnerability."
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | .Net Framework | 4.0 |
| Microsoft | Windows 2003 Server | All versions |
| Microsoft | Windows 7 | - |
| Microsoft | Windows Server 2003 | All versions |
| Microsoft | Windows Server 2008 | All versions |
| Microsoft | Windows Vista | All versions |
| Microsoft | Windows Xp | All versions |
Related Weaknesses (CWE)
References
- http://stackoverflow.com/questions/2135509/bug-only-occurring-when-compile-optimExploit
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-04
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3
- http://stackoverflow.com/questions/2135509/bug-only-occurring-when-compile-optimExploit
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-04
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3
FAQ
What is CVE-2011-1271?
CVE-2011-1271 is a vulnerability with a CVSS score of 7.7 (HIGH). The JIT compiler in Microsoft .NET Framework 3.5 Gold and SP1, 3.5.1, and 4.0, when IsJITOptimizerDisabled is false, does not properly handle expressions related to null strings, which allows context-...
How severe is CVE-2011-1271?
CVE-2011-1271 has been rated HIGH with a CVSS base score of 7.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2011-1271?
Check the references section above for vendor advisories and patch information. Affected products include: Microsoft .Net Framework, Microsoft Windows 2003 Server, Microsoft Windows 7, Microsoft Windows Server 2003, Microsoft Windows Server 2008.