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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.

Google Releases Chrome 8.0.552.237

Google has released Chrome 8.0.552.237 for all platforms to address multiple vulnerabilities. These vulnerabilities may allow an attacker to execute arbitrary code or cause a denial-of-service condition.

US-CERT encourages users and administrators to review the Google Chrome Releases blog entry and apply any necessary updates to help mitigate the risks.

Microsoft Security Advisory 2488013

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 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.

Microsoft Releases Advance Notification for January Security Bulletin

Microsoft has issued a Security Bulletin Advance Notification indicating that its January release will contain two bulletins. These bulletins will have the severity ratings of critical and important and will be for Microsoft Windows. Release of these bulletins is scheduled for Tuesday, January 11, 2011.

US-CERT will provide additional information as it becomes available.

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