Date Discovered December 8, 2009
Description The implementation of the Protected Extensible Authentication Protocol (PEAP) used by Microsoft's Internet Authentication System is prone to an authentication-bypass vulnerability.
Successful exploits would allow an attacker to gain unauthorized access to network resources.
Block external access at the network boundary, unless external parties require service. If global access isn't needed, block access at the network perimeter to computers hosting the vulnerable operating system.
Run all software as a nonprivileged user with minimal access rights. To limit the consequences of a successful exploit, run the vulnerable application with the least amount of privileges required.
Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity such as unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.
An advisory and updates are available. Please see the references for details.
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