Vulnerability: (981374) Vulnerability in Internet Explorer Could Allow Remote Code Execution

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	Details
Vulnerability name/brief description	(981374) Vulnerability in Internet Explorer Could Allow Remote Code Execution
CVE/CAN name	CVE-2010-0806
Vendor threat level	Critical
SophosLabs threat level	Critical
Solution	MS10-018
Vendor description	Microsoft is investigating new, public reports of a vulnerability in Internet Explorer 6 and Internet Explorer 7. Our investigation has shown that the latest version of the browser, Internet Explorer 8, is not affected. The main impact of the vulnerability is remote code execution.
SophosLabs comments	A malicious or compromised website could be used as an attack vector for this vulnerability so it is very important for users to be cautious during web browsing. Particular caution should be taken when considering following web-links received via email, instant messaging or in documents from unknown individuals or that look in any way suspicious. Given the unpatched nature of this vulnerability and the popular use of the affected versions of Internet Explorer SophosLabs have assigned this issue a threat level of high. Update: This vulnerability has now been patched.
SophosLabs testing result	Tested on Internet Explorer 6 running on Windows XP service pack 3. Exploitation was successful.
Currently known exploits	Troj/ExpJS-R - CVE-2010-0806
First sample seen	10th March 2010
Discovery date	9th March 2010
Affected software	Microsoft Windows 2000 Service Pack 4 Windows XP Service Pack 2 and Windows XP Service Pack 3 Windows XP Professional x64 Edition Service Pack 2 Windows Server 2003 Service Pack 2 Windows Server 2003 x64 Edition Service Pack 2 Windows Server 2003 with SP2 for Itanium-based Systems Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2 Windows Vista x64 Edition , Windows Vista x64 Edition Service Pack 1, and Windows Vista x64 Edition and Service Pack 2 Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2 Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2 Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2 Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service Pack 4 Internet Explorer 6 for Windows XP Service Pack 2, Windows XP Service Pack 3, and Windows XP Professional x64 Edition Service Pack 2 Internet Explorer 6 for Windows Server 2003 Service Pack 2, Windows Server 2003 with SP2 for Itanium-based Systems, and Windows Server 2003 x64 Edition Service Pack 2 Internet Explorer 7 for Windows XP Service Pack 2, Windows XP Service Pack 3, and Windows XP Professional x64 Edition Service Pack 2 Internet Explorer 7 for Windows Server 2003 Service Pack 2, Windows Server 2003 with SP2 for Itanium-based Systems, and Windows Server 2003 x64 Edition Service Pack 2 Internet Explorer 7 in Windows Vista, Windows Vista Service Pack 1, Windows Vista Service Pack 2, Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and Windows Vista x64 Edition Service Pack 2 Internet Explorer 7 in Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2 Internet Explorer 7 in Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2 Internet Explorer 7 in Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2
References	http://www.microsoft.com/technet/security/Bulletin/MS10-018.mspx http://www.microsoft.com/technet/security/advisory/981374.mspx http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0806
Credits	MAPP
Revisions	9th March 2010 - Initial analysis written 10th March 2010 - Upgraded threat level to Critical in light of Troj/ExpJS-R detection 31st March 2010 - Updated with new patch identifier

Explanation of terms

Vulnerability Name/Brief Description:
Vendor identifier plus a brief description of the type of attack.

CVE/CAN Name:
Currently assigned CVE name. If a CVE name doesn't exist the CAN name will be used until a CVE has been assigned.

Vendor Threat Level:
Threat level assigned by the vendor

SophosLabs Threat Level:
Threat level assigned by SophosLabs

• LOW RISK - There is little chance of this vulnerability being actively exploited by malware.
• MEDIUM RISK - There is a possibility of this vulnerability being actively exploited by malware.
• HIGH RISK - There is a strong possibility of this vulnerability being actively exploited by malware.
• CRITICAL RISK - This vulnerability will almost certainly be actively exploited by malware.

Solution:
Vendor-supplied Patch identifier and recommended solution, or workaround if applicable.

Vendor Description:
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SophosLabs Comments:
SophosLabs' opinions and observations of the vulnerability in question.

SophosLabs Testing Result:
Details of completed lab testing, if applicable. Please note that the lab test environment may differ significantly from user environments.

Currently Known Exploits:
List of identities for known exploits, if applicable.

First Sample Seen:
Date of the first sample seen by SophosLabs.

Discovery Date:
Date of the earliest known publically disclosed advisory.

Affected Software:
Vulnerable platforms and software versions.