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Vulnerability Details : CVE-2011-1271

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."
Publish Date : 2011-05-10 Last Update Date : 2011-08-12
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- CVSS Scores & Vulnerability Types

CVSS Score
5.1
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity High (Specialized access conditions exist. It is hard to exploit and several special conditions must be satisfied to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Execute CodeBypass a restriction or similar
CWE ID 264

- Related OVAL Definitions

Title Definition Id Class Family
.NET Framework JIT Optimization Vulnerability oval:org.mitre.oval:def:12686 windows
MS11-044: Vulnerability in .NET Framework Could Allow Remote Code Execution (2538814) oval:gov.nist.fdcc.patch:def:11761 windows
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2011-1271

# Product Type Vendor Product Version Update Edition Language
1 Application Microsoft .net Framework 2.0 SP2 Version Details Vulnerabilities
2 Application Microsoft .net Framework 2.0 SP1 Version Details Vulnerabilities
3 Application Microsoft .net Framework 3.5 Version Details Vulnerabilities
4 Application Microsoft .net Framework 3.5 SP1 Version Details Vulnerabilities
5 Application Microsoft .net Framework 3.5.1 Version Details Vulnerabilities
6 Application Microsoft .net Framework 4.0 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Microsoft .net Framework 6

- References For CVE-2011-1271

http://technet.microsoft.com/en-us/security/bulletin/ms11-044
Microsoft Security Bulletin MS11-044 MS11-044 - Critical : Vulnerability in .NET Framework Could Allow Remote Code Execution (2538814) - Version: 1.3 Severity Rating: Critical Revision Note: V1.3 (July 10, 2012): Microsoft revised this bulletin to communicate a minor detection change for KB2518864 for Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5 Service Pack 1 to correct an offering issue. There were no changes to the security update files. Customers who have already successfully updated their systems do not need to take any action. Summary: This security update resolves a publicly disclosed vulnerability in Microsoft .NET Framework. The vulnerability could allow remote code execution on a client system if a user views a specially crafted Web page using a Web browser that can run XAML Browser Applications (XBAPs). Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. The vulnerability could also allow remote code execution on a server system running IIS, if that sRelease Date:2012-07-10
http://stackoverflow.com/questions/2135509/bug-only-occurring-when-compile-optimization-enabled/

- Vulnerability Conditions

Vulnerability is valid if product versions listed below are used TOGETHER WITH(AND)
Vulnerability is valid if product versions listed below are used TOGETHER WITH(AND)
Vulnerability is valid if product versions listed below are used TOGETHER WITH(AND)
Vulnerability is valid if product versions listed below are used TOGETHER WITH(AND)
Vulnerability is valid if product versions listed below are used TOGETHER WITH(AND)
Vulnerability is valid if product versions listed below are used TOGETHER WITH(AND)

- Metasploit Modules Related To CVE-2011-1271

There are not any metasploit modules related to this vulnerability (Please visit www.metasploit.com for more information)


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