Products & Services
Support

Product Categories


Popular Downloads


Manage Software

How to Buy

For Home

Linksys Products Store
Linksys is now part of Belkin
Products for everyone

All Ordering Options

Training & Events Partners
Guest

Vulnerability Alert

Microsoft Office Web Components Buffer Overflow Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:18761
Version:3
First Published:2009 August 11 17:56 GMT
Last Published:2010 March 04 13:17 GMT
Port: Not available
CVE:CVE-2009-1534
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.3
Related Resources:
View related IPS Signature
 
 
Version Summary:

Proof-of-concept code that exploits the Microsoft Office web components buffer overflow vulnerability is publicly available.

 
 
Description

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

This vulnerability exists due to errors in processing malformed data by the Office Web Components ActiveX control.  An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website.  If successful, the attacker could execute arbitrary code with the privileges of the user.

Proof-of-concept code that exploits this vulnerability is publicly available.

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

 
Warning Indicators

The following applications are vulnerable:

  • Microsoft Office XP SP3 and prior
  • Microsoft Office 2000 Web Components SP3 and prior
  • Microsoft Office XP Web Components SP3 and prior
  • Microsoft BizTalk Server 2002 and prior
  • Microsoft Visual Studio .NET 2003 SP1 and prior
 
IntelliShield Analysis

In order to exploit this vulnerability, an attacker must convince a user to view a malicious website.  Attackers may attempt to embed malicious content within public websites and direct users to those sites via e-mailed links.  The attacker may also use social engineering techniques in an attempt to convince users that sites or e-mail messages originate from known, trusted sources.

If an exploit is successful, the attacker could execute arbitrary code with the privileges of the user.  End-host systems on which users hold Administrator privileges are most at risk, as an exploit where the users holds elevated privileges could allow the attacker to gain complete control over the system.

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 Administrator privileges, the attacker could execute arbitrary code to gain complete control over the system.

 
Technical Information

This vulnerability exists due to errors in processing malformed data by the Office Web Components ActiveX control.? The processing of overly large data could trigger a buffer overflow, corrupting system memory.? An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website designed to send malformed data to the vulnerable ActiveX control.? The processing of the data could cause memory corruption, which the attacker could leverage to execute arbitrary code with the privileges of the user.

 
Safeguards

Administrators are advised to apply the applicable 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
20145/0Microsoft Office Web Components ActiveX Buffer OverflowS4242009 Aug 11 
20145/1Microsoft Office Web Components ActiveX Buffer OverflowS4242009 Aug 11 
20145/2Microsoft Office Web Components ActiveX Buffer OverflowS4242009 Aug 11 
20145/3Microsoft Office Web Components ActiveX Buffer OverflowS5082010 Aug 16 
20145/4Microsoft Office Web Components ActiveX Buffer OverflowS5082010 Aug 16 
 
Alert History
 

Version 2, August 17, 2009, 1:47 PM: The Applied Mitigations Bulletin Link has been corrected for the Microsoft Office web components buffer overflow vulnerability

Version 1, August 11, 2009, 1:56 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.BizTalk Server 2002 Base
Microsoft, Inc.Office XP (2002) Base, SP1, SP2, SP3
Microsoft, Inc.Office Web Components (OWC) 9 (Office 2000) Base | 10 (Office XP) Base
Microsoft, Inc.Visual Studio .NET 2003 Base, SP1

Associated Products:
N/A




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
Powered by  IntelliShield