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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.

RIM Releases Security Advisory for BlackBerry Enterprise Server

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 Releases January Security Bulletin

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.

Microsoft Internet Explorer 8 use-after-free Vulnerability

US-CERT is aware of a vulnerability affecting Microsoft Internet Explorer 8. This vulnerability is due to improper handling of circular memory references. Exploitation of this vulnerability may allow an attacker to execute arbitrary code in the context of the user or cause a denial-of-service condition.

At this time, the vendor has not released a fix or a workaround to address this vulnerability. Users and administrators are encouraged to consider implementing the mitigations provided in Microsoft's Enhanced Mitigation Experience Toolkit (EMET). These mitigations will not rectify the vulnerability but will make exploitation of the vulnerability more difficult.

Additional information can be found in US-CERT Vulnerability Note VU#427980. US-CERT will provide updates as further details become available.

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