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Vulnerability: MS10-060 - Vulnerabilities in the Microsoft .NET Common Language Runtime and in Microsoft Silverlight Could Allow Remote Code Execution (2265906)

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Details
Vulnerability name/brief description MS10-060 - Vulnerabilities in the Microsoft .NET Common Language Runtime and in Microsoft Silverlight Could Allow Remote Code Execution (2265906)
CVE/CAN name CVE-2010-0019
CVE-2010-1898
Vendor threat level Critical
SophosLabs threat level Medium
Solution

MS10-060

Vendor description This security update resolves one publicly disclosed vulnerability and one privately reported vulnerability 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 convincing a user to run a specially crafted Microsoft .NET application. 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 the page, as could be the case in a Web hosting scenario.
SophosLabs comments The patch encompasses how .NET runtime handles interfaces and how Silverlight handles pointers. At worst, attacker who successfully exploits these vulnerabilities would gain the rights and privileges of the current user. The fact that these vulnerabilities were privately disclosed and that we are yet to see any malware that exploit these issues have been considered when assigning the SophosLabs threat rating of Medium, although we do recommend that users apply this patch at their earliest convenience.
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 August 10, 2010
Affected software Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista Service Packs 1 and 2
Windows Vista x64 Edition Service Packs 1 and 2
Windows Server 2008 for 32-bit Systems No Service Pack and Serive Pack 2
Windows Server 2008 for x64-based Systems No Service Pack and Serive Pack 2
Windows Server 2008 for Itanium-based Systems No Service Pack and Serive Pack 2
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 for Itanium-based Systems
References http://www.microsoft.com/technet/security/bulletin/MS10-060.mspx
http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2010-0019
http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2010-1898
Credits Microsoft MAPP
Revisions August 10, 2010 - 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.

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