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Vulnerability: MS09-061 - Critical Vulnerabilities in the Microsoft .NET Common Language Runtime Could Allow Remote Code Execution (974378)
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| Details | |
|---|---|
| Vulnerability name/brief description | MS09-061 - Critical Vulnerabilities in the Microsoft .NET Common Language Runtime Could Allow Remote Code Execution (974378) |
| CVE/CAN name | CVE-2009-0090, CVE-2009-0091, CVE-2009-2497 |
| Vendor threat level | Critical |
| SophosLabs threat level | Medium |
| Solution | Apply the patch/update related to MS09-061 or, to provide protection prior to applying the patch; disable partially trusted Microsoft .NET applications and disable XAML browser applications in Internet Explorer. |
| Vendor description | This security update resolves three privately reported vulnerabilities in Microsoft .NET Framework and Microsoft Silverlight. The vulnerabilities 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) or Silverlight applications, or if an attacker succeeds in persuading a user to run a specially crafted Microsoft .NET application. 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 vulnerabilities could also allow remote code execution on a server system running IIS, if that server allows processing ASP.NET pages and an attacker succeeds in uploading a specially crafted ASP.NET page to that server and executing it, as could be the case in a Web hosting scenario. Microsoft .NET applications, Silverlight applications, XBAPs and ASP.NET pages that are not malicious are not at risk of being compromised because of this vulnerability. |
| SophosLabs comments | This update addresses three Remote Code Execution vulnerabilities in the Microsoft .NET Runtime. These vulnerabilities could be exploited to run unmanaged code via the Microsoft .NET Framework, Microsoft Silverlight, XAML Browser Applications(XBAPs), or IIS servers that allow the processing of ASP .NET. Existing .NET, Silverlight, XBAPs and ASP .NET applications are not at risk of being compramised by these vulnerabilities, as the vulnerability lies in how the framework processes specially crafted malicious applications - the applications themselves are not vulnerable. |
| SophosLabs testing result | N/A |
| Currently known exploits | At the time of writing SophosLabs have not observed any malware attempting to exploit this vulnerability. Should this situation change samples will be analyzed and we will take action as necessary. |
| First sample seen | N/A |
| Discovery date | 08 January 2009 |
| Affected software | All supported releases of Microsoft Windows Microsoft .NET Framework 3.0 Microsoft .NET Framework 3.0 Service Pack 1 Microsoft .NET Framework 3.0 Service Pack 2 Microsoft .NET Framework 3.5.1 Windows Vista Service Pack 1 Microsoft .NET Framework 3.5 Windows Vista Service Pack 2 Microsoft .NET Framework 3.5 Microsoft .NET Framework 3.5 Service Pack 1 Windows Vista x64 Edition Service Pack 1 Microsoft .NET Framework 3.5 Windows Vista x64 Edition Service Pack 2 Microsoft .NET Framework 3.5 Microsoft .NET Framework 3.5 Service Pack 1 Windows Server 2008 for 32-bit Systems Windows Server 2008 for x64-based Systems Windows Server 2008 for Itanium-based Systems Microsoft .NET Framework 3.5 Windows Server 2008 for 32-bit Systems Service Pack 2 Windows Server 2008 for x64-based Systems Service Pack 2 Windows Server 2008 for Itanium-based Systems Service Pack 2 Microsoft .NET Framework 3.5 Microsoft .NET Framework 3.5 Service Pack 1 Microsoft Silverlight 3 |
| References | http://www.microsoft.com/technet/security/Bulletin/ms09-061.mspx http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0090 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0091 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2497 |
| Credits | Microsoft MAPP Pavel Minaey (CVE-2009-0090) Jeroen Frijters (CVE-2009-0091) |
| Revisions | October 14th 2009 - Initial analysis written. |
Explanation of terms
Vulnerability Name/Brief Description:
Vendor identifier plus a brief description of the type of attack.
CVE/CAN Name:
Currently assigned CVE name. If a CVE name doesn't exist the CAN name will be used until a CVE has been assigned.
Vendor Threat Level:
Threat level assigned by the vendor
SophosLabs Threat Level:
Threat level assigned by SophosLabs
- LOW RISK - There is little chance of this vulnerability being actively exploited by malware.
- MEDIUM RISK - There is a possibility of this vulnerability being actively exploited by malware.
- HIGH RISK - There is a strong possibility of this vulnerability being actively exploited by malware.
- CRITICAL RISK - This vulnerability will almost certainly be actively exploited by malware.
Solution:
Vendor-supplied Patch identifier and recommended solution, or workaround if applicable.
Vendor Description:
Summary of the cause and potential effect of the vulnerability provided by the vendor.
SophosLabs Comments:
SophosLabs' opinions and observations of the vulnerability in question.
SophosLabs Testing Result:
Details of completed lab testing, if applicable. Please note that the lab test environment may differ significantly from user environments.
Currently Known Exploits:
List of identities for known exploits, if applicable.
First Sample Seen:
Date of the first sample seen by SophosLabs.
Discovery Date:
Date of the earliest known publically disclosed advisory.
Affected Software:
Vulnerable platforms and software versions.
If you need more information or guidance, then please contact technical support.
- Article ID: 64688
- Created: 14 Oct 2009
- Last updated: 14 Oct 2009
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