Microsoft Windows is susceptible to a vulnerability in the RPC component, specifically when using the mutual authentication mechanism with the SSL (Secure Socket Layer) protocol. This issue is due to a flaw in the mutual authentication mechanism that can occur when it attempts to validate the identity of an RPC service. This can allow the attacker to spoof a valid RPC service that victims of the attack may inadvertently access. Exploitation of this issue could potentially expose the victim to other attacks.
Block external access at the network boundary, unless external parties require service.
Use network access controls to restrict unauthorized incoming and outgoing network connections. This may prevent clients from connecting to malicious services or limit attacks from hostile services.
Implement multiple authentication mechanisms.
Implement additional mechanisms such as IPSec to secure network traffic.
The vendor has released a security bulletin and fixes to address this issue.