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Vulnerability Alert

Microsoft Office Web Components Memory Allocation Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:18758
Version:2
First Published:2009 August 11 17:48 GMT
Last Published:2009 August 12 19:32 GMT
Port: Not available
CVE:CVE-2009-0562
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
Related Resources:
View related IPS Signature
 
 
Version Summary:

Additional technical information is available for the Microsoft Office Web Components memory allocation vulnerability.

 
 
Description

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

The vulnerability is due to a flaw with the loading and unloading of a control in Microsoft Office Web Components.  An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website.  If the user views the site, the attacker could execute arbitrary code with the privileges of the user.

Microsoft has confirmed this vulnerability in a security bulletin and released software updates that correct it.

 
Warning Indicators

The following applications are affected:

  • Microsoft Office XP SP3 and prior
  • Microsoft Office 2003 SP3 and prior
  • Microsoft Office XP Web Components SP3 and prior
  • Microsoft Office 2003 Web Components SP3 and prior
  • Microsoft Internet Security and Acceleration Server 2004 Enterprise and Standard Edition SP3 and prior
  • Microsoft Internet Security and Acceleration Server 2006 SP1
  • Microsoft Office Small Business Accounting 2006
 
IntelliShield Analysis

Attackers cannot directly exploit this vulnerability and instead must rely on user interaction to accomplish an exploit.  To convince users to visit malicious sites, attackers may send targeted e-mail messages with embedded links combined with text instructions.  An attacker may also inject malicious content into public websites or compromised websites in the hopes that users may visit those sites, triggering the embedded exploits.

If an exploit is successful, the attacker could execute arbitrary code with the privileges of the user.  If that user holds elevated privileges, the attacker could execute arbitrary code to install malicious software or create additional user accounts on the system, resulting in a complete compromise.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the August 2009 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 August 2009

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-043

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the user.  If that user holds elevated privileges, the attacker could execute arbitrary code that could cause a complete system compromise.

 
Technical Information

The vulnerability is due to a flaw in Microsoft Office Web Components during the process of loading and unloading a control, 0002E543-0000-0000-C000-000000000046, which causes the control to be transferred to unallocated memory.

As a result, an unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website that is designed to pass malicious input to the Office Web Components ActiveX control.  The processing of the website could trigger an error condition that could allow the attacker to execute arbitrary code with the privileges of the user.

 
Safeguards

Administrators are advised to apply the appropriate software updates.

Administrators may consider configuring Internet Explorer to prompt users before running Active Scripting or ActiveX controls by setting the Internet and Local Intranet security zone settings to High. Alternately, administrators could disable Active Scripting and ActiveX controls in these security zones.

Administrators are advised to prevent the Office Web Component ActiveX control from running in Internet Explorer by setting the kill bit on the following CLSIDs:

0002E543-0000-0000-C000-000000000046
0002E55B-0000-0000-C000-000000000046

Administrators are advised to unregister the Office Web Components owc10.dll and owc11.dll libraries.

Users are advised not to visit websites or follow links that have suspicious characteristics or cannot be verified as safe.

Users are advised to run applications with the least necessary privileges.

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.

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
20148/0Microsoft Office Web Components ActiveX Buffer OverflowS4242009 Aug 11 
20148/1Microsoft Office Web Components ActiveX Buffer OverflowS4242009 Aug 11 
 
Alert History
 

Version 1, August 11, 2009, 1:48 PM: Microsoft Office Web Components contain a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user.  Updates are available.



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

Primary Products:
Microsoft, Inc.ISA Server 2004 Base, SP1, SP2, SP3 | 2006 Base, SP1
Microsoft, Inc.Office XP (2002) Base, SP1, SP2, SP3 | 2003 Base, SP1, SP2, SP3, Multilingual User Interface Pack
Microsoft, Inc.Office Small Business Accounting 2006 Base
Microsoft, Inc.Office Web Components (OWC) 10 (Office XP) Base | 11 (Office 2003) Base

Associated Products:
N/A




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