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MS09-061 - Critical: Vulnerabilities in the Microsoft .NET Common Language Runtime Could Allow Remote Code Execution (974378) - Version:1.3

Posted on 12 May 2010

There is an newer version: MS09-061 - Version: 1.4

Critical

Severity Rating: Critical - Revision Note: V1.3 (May 11, 2010): Revised this bulletin to announce a detection logic change to fix a reoffer issue with Windows XP and Windows Server 2003. This is a detection change only that does not affect the files contained in the initial update. Also, corrected installation switches for KB953300 and KB974417 on Windows 2000, Windows XP, and Windows Server 2003, and corrected verification registry keys for KB953300 on Windows XP. Customers who have successfully updated their systems do not need to reinstall this update.Summary: 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.

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