Microsoft .NET Framework is prone to a remote buffer-overflow vulnerability because it fails to perform adequate boundary checks on user-supplied data. An attacker can exploit this issue to execute arbitrary code in the context of a user running the application. Successful exploits can result in the complete compromise of affected computers. Failed attacks will likely result in denial-of-service conditions.
To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.
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 successful exploits.
Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources.
Since this issue may be leveraged to execute code, we recommend memory-protection schemes, such as nonexecutable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploits of memory-corruption vulnerabilities.
Microsoft has released security bulletin MS07-040 as well as updates to address this issue. Please see the references for details. Microsoft security bulletin MS07-040 has been revised; please see the referenced bulletin for details.