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Vulnerability Alert

Microsoft Office Web Components ActiveX Control Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:18633
Version:6
First Published:2009 July 13 14:24 GMT
Last Published:2009 October 12 18:25 GMT
Port: Not available
CVE:CVE-2009-1136
BugTraq ID:18633
Urgency:Possible use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.7
 
Version Summary:

IntelliShield has re-released this alert to clarify the availability of software updates.

 
 
Description

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

This vulnerability is due to insufficient input sanitization 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.

Reports indicate that exploits that leverage this vulnerability are ongoing.

Microsoft has confirmed this vulnerability in a security advisory and released software updates.

 
Warning Indicators

The following Microsoft products 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 Standard Edition SP3
  • Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition SP3
  • Microsoft Internet Security and Acceleration Server 2006 SP1 and prior
  • Microsoft Office Small Business Accounting 2006
 
IntelliShield Analysis

Attackers cannot directly exploit this vulnerability and instead rely upon user participation in order to accomplish an exploit.? An attacker may embed malicious content on public sites or send links to users within targeted e-mail messages in order to convince a user to visit a malicious site.? If successful, the attacker could execute arbitrary code with the privileges of the user.

Microsoft has reported that exploits against this vulnerability are occurring.? However, no exploit code is known to be publicly available, likely limiting the origin of attacks to a single source.

Software updates are not yet available, but Microsoft has announced that patches are forthcoming.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities from Microsoft Security Bulletin 973472?that can be identified or mitigated using Cisco devices. ?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: Identifying and Mitigating the Microsoft Office Web Components ActiveX Control Arbitrary Code Execution Vulnerability

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

Microsoft has re-released a security advisory at the following link: 973472

US-CERT has released a vulnerability note at the following link: VU#545228

 
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 code resulting in complete system compromise.

 
Technical Information

This vulnerability is due to errors that may occur when the Office Web Components ActiveX control processes malformed data.? The control fails to check input that is submitted to the msDataSourceObject() function.? The processing of malicious 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 available software updates.

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

0002E541-0000-0000-C000-000000000046
0002E559-0000-0000-C000-000000000046

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 unregister the office web components library.

Administrators are advised to place only trusted websites in the the Trusted sites zone.

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
19520/0Microsoft Office Web Components ActiveX OverflowS6652012 Sep 06 
19520/1Microsoft Office Web Components ActiveX OverflowS6652012 Sep 06 
19520/2Microsoft Office Web Components ActiveX OverflowS4172009 Jul 21 
19520/3Microsoft Office Web Components ActiveX OverflowS4192009 Jul 27 
19520/4Microsoft Office Web Components ActiveX OverflowS4192009 Jul 27 
19520/5Microsoft Office Web Components ActiveX OverflowS4192009 Jul 27 
20143/0Microsoft Office Web Components ActiveX Buffer OverflowS4242009 Aug 11 
20143/1Microsoft Office Web Components ActiveX Buffer OverflowS5182010 Oct 05 
 
Alert History
 

Version 5, August 12, 2009, 3:12 PM: Additional technical information is available to detail the Microsoft Office Web Components ActiveX control arbitrary code execution vulnerability.

Version 4, August 11, 2009, 3:37 PM: Microsoft has released a security bulletin and software updates to address the Microsoft Office Web Components ActiveX control arbitrary code execution vulnerability.

Version 3, July 24, 2009, 9:57 AM: Microsoft has re-released an advisory with additional safeguard for the Microsoft Office Web Components ActiveX Control arbitrary code execution vulnerability.  US-CERT has released a VU note.

Version 2, July 13, 2009, 2:49 PM: Cisco has released an Applied Mitigation Bulletin to help users to mitigate attacks attempting to exploit the Microsoft Office Web Components ActiveX Control arbitrary code execution vulnerability.

Version 1, July 13, 2009, 10:24 AM: 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 not available.



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

Primary Products:
Microsoft, Inc.Office Web Components (OWC) 10 (Office XP) Base | 11 (Office 2003) Base

Associated 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




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