Microsoft .NET Framework Information Disclosure (CVE-2010-3332):
The Microsoft .NET Framework discloses enough information in error responses that an attacker is able to decrypt and modify encrypted data. The attacker is also able to forge cookies and obtain application files via an Oracle padding attack.

Get some: http://www.snort.org/vrt/advisories/2010/09/23/vrt-rules-2010-09-23.html