http://www.microsoft.com/technet/security/bulletin/ms09-050.mspx
Again, i can only stress it has taken a full month before MS released the fix so make sure to read my post on how TMG protects you from 0-day vulnerabilities.
http://trycatch.be/blogs/decaluwet/archive/2009/09/29/how-tmg-protects-you-from-smbv2-0-day-vulnerability.aspx