Vulnerability: MS10-031 - Vulnerability in Microsoft Visual Basic for Applications Could Allow Remote Code Execution (978213)

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	Details
Vulnerability name/brief description	MS10-031 - Vulnerability in Microsoft Visual Basic for Applications Could Allow Remote Code Execution (978213)
CVE/CAN name	CVE-2010-0815
Vendor threat level	Critical
SophosLabs threat level	Medium
Solution	MS10-031
Vendor description	This security update resolves a privately reported vulnerability in Microsoft Visual Basic for Applications. The vulnerability could allow remote code execution if a host application opens and passes a specially crafted file to the Visual Basic for Applications runtime. 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	A flaw in the way the "Microsoft Visual Basic Runtime" searches for ActiveX controls could allow remote code execution when a host application loads a specially crafted file to the Visual Basic runtime. Although Office and the Visual Basic runtime are common, considering that this vulnerability was not publicaly disclosed, the nature of the vulnerability, lack of observed samples and the availability of a patch, Sophos has classified this risk as medium.
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	11 May 2010
Affected software	Microsoft Office XP Service Pack 3 Microsoft Office 2003 Service Pack 3 2007 Microsoft Office System Service Pack 1 and 2007 Microsoft Office System Service Pack 2
References	http://www.microsoft.com/technet/security/bulletin/MS10-031.mspx http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2010-0815
Credits	Microsoft MAPP
Revisions	11 May 2010 - Initial analysis written

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:
Summary of the cause and potential effect of the vulnerability provided by the vendor.

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.