Microsoft has released an out-of-band bulletin MS11-100 addressing four vulnerabilities on Dec 29th, 2011. The bulletin is rated by Microsoft as critical, and the vulnerabilities are listed as below:

• Collisions in HashTable May Cause DoS Vulnerability – CVE-2011-3414
• Insecure Redirect in .NET Form Authentication Vulnerability – CVE-2011-3415
• ASP.Net Forms Authentication Bypass Vulnerability – CVE-2011-3416
• ASP.NET Forms Authentication Ticket Caching Vulnerability – CVE-2011-3417

SonicWALL UTM team has researched these vulnerabilities at the same day and created a couple of IPS signatures to capture the attack traffic. Due to the nature of the vulnerabilities, it is hard to distinguish the legitimate traffic from the attack traffic for some of them. The following are the list of covered vulnerabilities and the IPS signatures.

• Collisions in HashTable May Cause DoS Vulnerability – CVE-2011-3414
• 7260 Microsoft .NET Framework Denial of Service
• 7261 Microsoft .NET Framework Denial of Service 2
• Insecure Redirect in .NET Form Authentication Vulnerability – CVE-2011-3415
• 7262 ASP.NET Forms Authentication Redirect Vulnerability
• ASP.Net Forms Authentication Bypass Vulnerability – CVE-2011-3416
• 7263 ASP.NET Forms Authentication Bypass 1
• 7264 ASP.NET Forms Authentication Bypass 2

For the Microsoft vulnerabilities covered by SonicWALL, please refer to SonicWALL MAPP for details.