MS12-046 - Vulnerability in Visual Basic for Applications Could Allow Remote Code Execution (2707960)

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Details
Vulnerability name/brief description MS12-046 - Vulnerability in Visual Basic for Applications Could Allow Remote Code Execution (2707960)
CVE/CAN name
Vendor threat level Important
SophosLabs threat level Medium
Solution MS12-046
Vendor description This security update resolves one publicly disclosed vulnerability in Microsoft Visual Basic for Applications. The vulnerability could allow remote code execution if a user opens a legitimate Microsoft Office file (such as a .docx file) that is located in the same directory as a specially crafted dynamic link library (DLL) file. An attacker could then install programs; view, change, or delete data; or create new accounts that have full user rights. If a user is logged on with administrative user rights, an attacker could take complete control of the affected system. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
SophosLabs comments This vulnerability can be exploited remotely if a user opens a document on a network share or through WebDAV. Remote exploitation can be mitigated by disabling loading of libraries from WebDav and blocking TCP ports 139 and 145 on the perimeter firewall.
SophosLabs testing result No SophosLabs testing result found
Currently known exploits No currently known exploits found
First sample seen No samples found
Discovery date 10 Jul 2012
Affected software Microsoft Office 2003 Service Pack 3
Microsoft Office 2007 Service Packs 2 and 3
Microsoft Office 2010 (32-bit editions) No Service Pack and Service Pack 1
Microsoft Office 2010 (64-bit editions) No Service Pack and Service Pack 1
Microsoft Visual Basic for Applications
Microsoft Visual Basic for Applications SDK
References
Credits
  • MAPP
Revisions
  • July 10, 2012 - 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:

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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.