A remote buffer overflow vulnerability affects Microsoft Windows. This issue is due to a failure of the affected functionality to properly validate the length of user-supplied strings prior to copying them into static process buffers. This vulnerability may be exploited over RPC. An attacker may exploit this issue to execute arbitrary code with SYSTEM privileges, facilitating unauthorized access or privilege escalation. It should be noted that MSMQ is not installed by default on affected platforms and must be manually installed for a computer to be vulnerable. The vulnerability is reportedly not present on computers that only enable MSMQ HTTP Message Delivery.
Block external access at the network boundary, unless external parties require service.
Block access to RPC ports including UDP ports 135, 137, 138, and 445 and TCP ports 135, 139, 445, and 593. Any unsolicited traffic to ports greater than 1024 should also be blocked in addition to any other port that has been specifically configured for RPC.
Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Network intrusion detection systems should be deployed to monitor network traffic for signs of anomalous or suspicious activity. This includes, but is not limited to, requests that contain NOP sleds and unexplained ingoing and outgoing traffic. This may indicate exploitation attempts or activity that results from successful exploitation.
Disable any services that are not needed.
Disable the MSMQ component if it is present and not needed on the computer.
Microsoft has released updates to address this issue on supported platforms.