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Vulnerability Alert

Microsoft Office Rich Text Format Content Processing Buffer Overflow Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:21716
Version:4
First Published:2010 November 09 18:27 GMT
Last Published:2011 April 21 17:43 GMT
Port: Not available
CVE:CVE-2010-3333
BugTraq ID:44652
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:8.1
Related Resources:
View related IPS Signature
 
 
Version Summary:

The CVSS score for this alert has been modified to reflect a higher potential for exploitation.  Additional information about the malware that exploits the 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 improper boundary restrictions when processing 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 the user.

A functional exploit that is a part of the Metasploit framework is publicly available.

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

Reports suggest that this vulnerability is being exploited in the wild using the TROJ_ARTIEF.AZ class of trojans.  This malware is circulated through spam e-mail messages that contain a .doc file as an attachment.  Further information about the malware that exploits the vulnerability is available in IntelliShield Alert 22988.

To exploit the vulnerability, the attacker must convince a user to open a malicious document within the vulnerable application.  The attacker may provide documents directly to the user as an attachment to an e-mail message or by convincing a user to follow a link that directs the user to a file 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 user.

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 a targeted system with the privileges of the user.? If that user holds elevated privileges, the attacker could completely compromise the targeted system.

 
Technical Information

The vulnerability is due to improper boundary restrictions while processing specific control word embedded in Rich Text Format (RTF) documents by the affected software.? The affected software copies property string values associated with the control word to an insufficiently-large buffer without proper validation, which could trigger a buffer overflow.

An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to view a malicious document that is crafted with overly large control word property string values.? When processed, the values could trigger a stack-based buffer overflow condition that corrupts memory.? An attacker could use the?memory corruption to execute arbitrary code with the privileges of the user.

 
Safeguards

Administrators are advised to apply the appropriate software updates.

Users are advised to read e-mail in plain text.

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.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
31239/0Windows RTF Stack Buffer OverflowS6572012 Jul 11 
31239/1Windows RTF Stack Buffer OverflowS6572012 Jul 11 
 
Alert History
 

Version 3, January 3, 2011, 8:37 AM: Proof-of-concept code that exploits the Microsoft Office Rich Text Format content processing buffer overflow vulnerability is publicly available.

Version 2, November 18, 2010, 10:20 AM: Additional technical information that describes the Microsoft Office Rich Text Format content processing buffer overflow vulnerability is publicly available.

Version 1, November 9, 2010, 1:27 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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