Sun Java Runtime Environment is prone to multiple remote buffer-overflow vulnerabilities because the application fails to perform adequate boundary checks on user-supplied data. Successfully exploiting these issues allows remote attackers to execute arbitrary code in the context of the application using the ActiveX control (typically Internet Explorer). Failed exploit attempts will likely result in denial-of-service conditions. Java Runtime Environment 6 Update 13 is vulnerable; other versions may also be affected. NOTE: These issues may be related to the vulnerabilities described in BID 35945 (Sun JRE/JDK Java Web Start ActiveX Control ATL Remote Code Execution Vulnerability).
Block external access at the network boundary, unless external parties require service.
Filter access to the affected computer at the network boundary if global access isn't needed. 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 successful exploits.
Run all software as a nonprivileged user with minimal access rights.
To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.
Set web browser security to disable the execution of script code or active content.
Since a successful exploit of these issues allows malicious code to execute in web clients, consider disabling support for script code and active content within the client browser. Note that this mitigation tactic might adversely affect legitimate websites that rely on the execution of browser-based script code.
Reports indicate that these issues have been fixed. Please see the references for more information.