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Vulnerability Alert

Microsoft Office Exception Handling Memory Corruption Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:21718
Version:2
First Published:2010 November 09 18:34 GMT
Last Published:2010 November 10 15:44 GMT
Port: Not available
CVE:CVE-2010-3335
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
 
Version Summary:

Additional technical information that describes the Microsoft Office exception handling memory corruption vulnerability is available.

 
 
Description

Microsoft Office contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to a parsing error that may occur when opening Microsoft Office documents.  An unauthenticated, remote attacker could exploit the vulnerability by convincing the user to view a malicious document.  If successful, the attacker could execute arbitrary code with the privileges of a targeted user.

Microsoft has confirmed the vulnerability in a security bulletin and released software updates.

 
Warning Indicators

The following Microsoft products are affected:

  • Office XP SP3 and prior
  • Office 2003 SP3 and prior
  • Office 2007 SP2 and prior
  • Office 2010 (32-bit editions)
  • Office 2010 (64-bit editions)
  • Office 2004 for Mac
  • Office 2008 for Mac
  • Office for Mac 2011
  • Open XML File Format Converter for Mac
 
IntelliShield Analysis

To exploit the vulnerability, the attacker must convince a targeted user to open a malicious document.? The attacker may provide a document to the targeted user as an attachment to an e-mail message or by convincing a user to follow a link to a document that is hosted on a remote file share or website.? When viewed, the document could trigger the vulnerability and execute arbitrary code on the system with the privileges of the targeted user.

Systems most at risk are those where users run applications with elevated privileges.? On such a system, the attacker could execute code resulting in a complete system compromise.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the November 2010 security bulletin release.? This Cisco bulletin, which assists administrators in identifying or mitigating these vulnerabilities using Cisco devices, is available at the following link: Cisco Applied Mitigation Bulletin: Microsoft Security Bulletin Release for November 2010?

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS10-087?

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on an affected system with the privileges of the targeted user.? If that user holds elevated privileges, the attacker could gain complete control over the system.

 
Technical Information

The vulnerability is due to improper parsing of Microsoft Office documents.  When a parsing error occurs, the application may free a memory pointer, then later access the freed memory, resulting in a memory error.

An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to open a malicious Microsoft Office document with a crafted Office Art record.  Processing the crafted document could cause memory corruption.  The attacker could take advantage of the memory corruption to execute arbitrary code with the privileges of the targeted user.

 
Safeguards

Administrators are advised to apply the appropriate software updates.

Users are advised not to open e-mail messages from suspicious or unrecognized sources.? If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.

Users may consider applying the Microsoft Office Isolated Conversion Environment (MOICE) to safely open Word, Excel, and PowerPoint files from suspicious or unrecognized sources on systems that are running Microsoft Office 2003 or Office 2007.

Administrators are advised to monitor critical systems.

Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.

 
Patches/Software

Microsoft customers can obtain updates directly by using the links in the security bulletin.? These updates are also distributed by Windows automatic update features and available on the Windows Update website.? Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.

 
Alert History
 

Version 1, November 9, 2010, 1:34 PM: Microsoft Office contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on the system with the privileges of a targeted user.? Updates are available.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Microsoft, Inc.Office XP (2002) Base, SP1, SP2, SP3 | 2003 Base, SP1, SP2, SP3 | 2007 Base, SP1, SP2 | 2010 Base
Microsoft, Inc.Office for Mac 2004 Base | 2008 Base | 2011 Base
Microsoft, Inc.Open XML File Format Converter for Mac 1.0 .0, .1, .2

Associated Products:
N/A




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