Microsoft Issues Patch for .NET Vulnerability
A new Microsoft security bulletin addresses flaws in Microsoft .NET Framework which can lead to an elevation-of-privilege attack.
The "critical" out-of-band bulletin, released on December 29, includes one publicly disclosed issue and three privately disclosed problems in Microsoft's framework for ASP.NET.
According to Microsoft's security bulletin summary, the patch eliminates the ability of an attacker to gain access to a user's account on an ASP.NET-based Web site if a specially crafted Web link were clicked. To successfully exploit this vulnerability, the hacker would also need to know the specific user name being targeted.
The update is designed for Microsoft .NET Framework 1.1 Service Pack 1, Microsoft .NET Framework 2.0 Service Pack 2, Microsoft .NET Framework 3.5 Service Pack 1, Microsoft .NET Framework 3.5.1, and Microsoft .NET Framework 4 running on any supported version of Windows.
The bulletin fixes these flaws "by correcting how the .NET Framework handles specially crafted requests, and how the ASP.NET Framework authenticates users and handles cached content," wrote Microsoft.
Microsoft's Pete Voss, Sr., response communications manager with the Trustworthy Computing Group, discussed how the flaws in .NET Framework could potentially be found in other software. "This is an industry-wide issue that could affect a broad spectrum of technologies," said Voss in a December 30 Webinar. "Since ASP.NET was at the greatest risk because of the public disclosure, we have focused our efforts so far on making sure we secure ASP.NET. We are actively investigating other technologies where this could be vulnerable and so far we do not think that classic ASP is vulnerable. Information on other affected technologies will be revealed as the issue develops."
Voss also clarified that shops "that are internet-facing and accept input from unauthenticated or untrusted user provided content" are at risk more than internal servers. He suggests these shops should deploy as soon as proper testing is complete.