Microsoft Windows Kerberos CVE-2012-2551 Denial of Service Vulnerability

Description

Microsoft Windows is prone to a remote denial-of-service vulnerability. Successful exploits will cause the system to crash, resulting in a denial-of-service condition.

Technologies Affected

• Microsoft Windows 7 for 32-bit Systems
• Microsoft Windows 7 for 32-bit Systems SP1
• Microsoft Windows 7 for x64-based Systems
• Microsoft Windows 7 for x64-based Systems SP1
• Microsoft Windows Server 2008 R2
• Microsoft Windows Server 2008 R2 Itanium
• Microsoft Windows Server 2008 R2 Itanium SP1
• Microsoft Windows Server 2008 R2 x64
• Microsoft Windows Server 2008 R2 x64 SP1

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

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. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from a successful exploit.

Do not accept or execute files from untrusted or unknown sources.
To reduce the likelihood of successful exploits, never handle files that originate from unfamiliar or untrusted sources.

Do not follow links provided by unknown or untrusted sources.
To reduce the likelihood of successful exploits, never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.

Vendor updates are available. Please see the references for more information.