The US-CERT Current Activity web page is a regularly updated summary of the most frequent, high-impact types of security incidents currently being reported to the US-CERT.
Microsoft Security Advisory 2488013 addresses a vulnerability in Internet Explorer. This advisory has been updated to include Microsoft Fix It 50591 that prevents the recursive loading of CSS style sheets in Internet Explorer as a mitigation for this vulnerability. Exploitation of this vulnerability may allow an attacker to execute arbitrary code.
US-CERT encourages users and administrators to review Microsoft Security Advisory 2488013 and implement the suggested workarounds to help mitigate the risks. Microsoft Fix IT 50591 is available from Microsoft Knowledgebase Article 2488013. Additional information regarding this vulnerability can be found in US-CERT Vulnerability Note VU#634956.
US-CERT will provide additional information as it becomes available.
RIM has released a security advisory to address a vulnerability in the PDF distiller of the BlackBerry attachment service for BlackBerry Enterprise Server. This vulnerability may allow an attacker to execute arbitrary code or cause a denial-of-service condition.
US-CERT encourages users and administrators to review BlackBerry security advisory KB25382 and apply any necessary updates to help mitigate the risks.
Microsoft has released updates to address vulnerabilities in Microsoft Windows as part of the Microsoft Security Bulletin Summary for January 2011. These vulnerabilities may allow an attacker to execute arbitrary code.
US-CERT encourages users and administrators to review the bulletin and follow best-practice security policies to determine which updates should be applied.