MS13-106 - Vulnerability in a Microsoft Office Shared Component Could Allow Security Feature Bypass (2905238)

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Details
Vulnerability name/brief description MS13-106 - Vulnerability in a Microsoft Office Shared Component Could Allow Security Feature Bypass (2905238)
CVE/CAN name
Vendor threat level Important
SophosLabs threat level Medium
Solution MS13-106
Vendor description This security update resolves one publicly disclosed vulnerability in a Microsoft Office shared component that is currently being exploited. The vulnerability could allow security feature bypass if a user views a specially crafted webpage in a web browser capable of instantiating COM components, such as Internet Explorer. In a web-browsing attack scenario, an attacker who successfully exploited this vulnerability could bypass the ASLR security feature, which helps protect users from a broad class of vulnerabilities. The security feature bypass by itself does not allow arbitrary code execution. However, an attacker could use this ASLR bypass vulnerability in conjunction with another vulnerability, such as a remote code execution vulnerability that could take advantage of the ASLR bypass to run arbitrary code. The security update addresses the vulnerability by helping to ensure that the Microsoft Office shared component properly implements ASLR.
SophosLabs comments A specific Microsoft Office shared component is vulnerable to attack as it was not built to implement the ASLR security feature. As a result, an attacker can more reliably predict memory offsets of specific instructions in a given call stack. As Microsoft Office is a common software package, SophosLabs strongly urges users to apply the update as soon as it is available.
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 Dec 2013
Affected software
Microsoft Office 2007 Service Pack 3
Microsoft Office 2010 Service Pack 1 (32-bit editions)
Microsoft Office 2010 Service Pack 2 (32-bit editions)
Microsoft Office 2010 Service Pack 1 (64-bit editions)
Microsoft Office 2010 Service Pack 2 (64-bit editions)
References
Credits
  • MAPP
Revisions
  • December 10, 2013 - Initial Revision 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:

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Vendor Description:

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SophosLabs Comments:

SophosLabs' opinions and observations of the vulnerability in question.

SophosLabs Testing Result:

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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.