Vulnerability: MS10-022 - Vulnerability in VBScript Scripting Engine Could Allow Remote Code Execution (981169)

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	Details
Vulnerability name/brief description	Vulnerability in VBScript Scripting Engine Could Allow Remote Code Execution (981169)
CVE/CAN name	CVE-2010-0483
Vendor threat level	Important
SophosLabs threat level	Medium
Solution	MS10-022
Vendor description	This security update resolves a publicly disclosed vulnerability in VBScript on Microsoft Windows that could allow remote code execution. This security update is rated Important for Microsoft Windows 2000, Windows XP, and Windows Server 2003. On Windows Server 2008, Windows Vista, Windows 7, and Windows Server 2008 R2, the vulnerable code is not exploitable, however, as the code is present, this update is provided as a defense-in-depth measure and has no severity rating. The vulnerability could allow remote code execution if a malicious Web site displayed a specially crafted dialog box on a Web page and a user pressed the F1 key, causing the Windows Help System to be started with a Windows Help File provided by the attacker. If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system.
SophosLabs comments	This remote code execution vulnerability specifically targets the way VBScript interacts with Windows Help files when using Internet Explorer. While Windows Help Files are inherently unsafe files, the implementation of VBScript on affected systems allows an attacker to specify a Help file location when displaying a dialog box on a Web page. If a visitor pressed the F1 key while such a dialog box is being displayed, this specially crafted Help file could be loaded by the Windows Help System, allowing execution of arbitrary code in the security context of the currently logged-on user. An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a user is logged on with administrative user rights, an attacker could take complete control of the affected system.
SophosLabs testing result	N/A
Currently known exploits	At the time of writing SophosLabs have not observed any malware attempting to exploit this vulnerability. Should this situation change samples will be analyzed and we will take action as necessary.
First sample seen	N/A
Discovery date	13th April 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 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 Windows 7 for 32-bit Systems Windows 7 for x64-based Systems Windows Server 2008 R2 for x64-based Systems Windows Server 2008 R2 for Itanium-based Systems
References	http://www.microsoft.com/technet/security/bulletin/MS10-022.mspx http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2010-0483
Credits	MAPP
Revisions	13th April 2010 - Initial analysis written

Explanation of terms

Vulnerability Name/Brief Description:
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CVE/CAN Name:
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Vendor Threat Level:
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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.

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First Sample Seen:
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Discovery Date:
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Affected Software:
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