Potentially catastrophic bug bites all versions of Windows. Patch now
Microsoft has disclosed a potentially catastrophic vulnerability in virtually all versions of Windows. People operating Windows systems, particularly those who run websites, should immediately install a patch Microsoft released Tuesday morning.
The vulnerability resides in the Microsoft secure channel (schannel) security component that implements the secure sockets layer and transport layer security (TLS) protocols, according to a Microsoft advisory. A failure to properly filter specially formed packets makes it possible for attackers to execute attack code of their choosing by sending malicious traffic to a Windows-based server.