A vulnerability has been reported in Microsoft Windows, which can be exploited by malicious people to cause a DoS (Denial of Service) or compromise a vulnerable system.

The vulnerability is caused due to an error within the Secure Channel (Schannel) security package when parsing digital signatures received from a server during the SSL handshake. This can be exploited to execute arbitrary code (Windows XP), cause the system to stop accepting SSL or TLS connections (Windows 2000), or cause the system to restart (Windows 2003) when a user e.g. visits a malicious website.

NOTE: Windows 2000 and 2003 are not exploitable for arbitrary code execution.

Solution
Apply patches.
Further details available to Secunia VIM customers

Provided and/or discovered by
The vendor credits Thomas Lim, COSEINC.

Changelog
Further details available to Secunia VIM customers

Original Advisory
MS07-031 (KB935840):
http://www.microsoft.com/technet/security/Bulletin/MS07-031.mspx

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers