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Vulnerability Alert

Microsoft Windows DHTML Editing Component ActiveX Control Remote Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:18957
Version:1
First Published:2009 September 08 19:34 GMT
Last Published:2009 September 08 19:34 GMT
Port: Not available
CVE:CVE-2008-4846 , CVE-2009-2519
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:

Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user.  Updates are available.

 
 
Description

Microsoft Windows 2000 SP4 and prior, Windows XP SP3 and prior, and Windows Server 2003 SP2 and prior contain a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.

This vulnerability is due to errors that occur when the vulnerable application processes malformed data by the DHTML Editing Component ActiveX control.  An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website.  A successful exploit could allow the attacker to execute arbitrary code with the privileges of the user.

Microsoft has confirmed this vulnerability in a security bulletin and released updated software.

 
Warning Indicators

Systems running the following versions of Microsoft Windows are vulnerable:

  • Windows 2000 SP4 and prior
  • Windows XP SP3 and prior
  • Windows XP Professional x64 Edition SP2 and prior
  • Windows Server 2003 SP2 and prior
  • Windows Server 2003 x64 Edition SP2 and prior
  • Windows Server 2003 for Itanium-based Systems with SP2 and prior
 
IntelliShield Analysis

To exploit this vulnerability, an attacker must convince a user to visit a malicious website.  Attackers cannot directly exploit the vulnerability without user interaction and may use social engineering tactics to convince users to participate in an exploit.

If an exploit is successful, the attacker could execute arbitrary code with the privileges of the user.  Systems that grant users elevated privileges are at greatest risk.  If the user holds privileges equivalent to the Administrator account, the attacker could execute arbitrary code that results in a complete system compromise.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the Security Bulletin Summary for September 2009.  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 September 2009

The update available from Microsoft corrects this vulnerability by removing affected code segments from the ActiveX control.

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-046

 
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 code that results in a complete system compromise.

 
Technical Information

This vulnerability is due to errors that occur when the vulnerable application processes malformed data by the DHTML Editing Component ActiveX control.  An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website that is designed to pass malicious data to the vulnerable control.  When processed, the malicious input could cause the ActiveX control to corrupt system memory.  The attacker could leverage the memory corruption to execute arbitrary code with the privileges of the user.

 
Safeguards

Administrators are advised to apply the appropriate update.

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 are advised to run applications with the least privileges necessary.

Administrators may consider disabling the DHTML Editing Component ActiveX control by setting the killbit on the following CLSID: 

2D360201-FFFS-11D1-8D03-00A0C959BC0A

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
20800/0DHTML Editing Component ActiveX Code ExecutionS4312009 Sep 08 
 
Alert History
 

Initial Release



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

Primary Products:
Microsoft, Inc.Windows 2000 Advanced Server Base, SP1, SP2, SP3, SP4 | Professional Base, SP1, SP2, SP3, SP4 | Server Base, SP1, SP2, SP3, SP4
Microsoft, Inc.Windows Server 2003 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit (Itanium) Base, SP1, SP2 | Datacenter Edition x64 (AMD/EM64T) Base, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit (Itanium) Base, SP1, SP2 | Enterprise Edition x64 (AMD/EM64T) Base, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit (Itanium) Base, SP1, SP2 | Standard Edition x64 (AMD/EM64T) Base, SP2 | Web Edition Base, SP1, SP2
Microsoft, Inc.Windows XP Home Edition Base, SP1, SP2, SP3 | Professional Edition Base, SP1, SP2, SP3 | Professional x64 (AMD/EM64T) Base, SP2

Associated Products:
N/A




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