Microsoft Windows Media Player is prone to a remote code-execution vulnerability when handling specially crafted compressed skin files. Attackers exploit this issue by coercing unsuspecting users to download and open Windows Media Player skin files (WMZ or WMD files). Successful exploits allow attackers to execute arbitrary code in the context of the vulnerable application. This facilitates the remote compromise of affected computers.
Run all software as a nonprivileged user with minimal access rights.
To lessen the potential damage that successful exploits may achieve, run all software as a nonadministrative user with the least amount of privileges required to successfully operate.
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.
Implement multiple redundant layers of security.
Various memory-protection schemes (such as nonexecutable and randomly mapped memory segments) may hinder an attacker's ability to exploit this vulnerability to execute arbitrary code.
Microsoft has released an advisory along with fixes to address this issue. Please see the references for more information.