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Vulnerability Alert

Microsoft Windows Kernel Font Processing Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:19358
Version:1
First Published:2009 November 10 19:07 GMT
Last Published:2009 November 10 19:07 GMT
Port: Not available
CVE:CVE-2009-2514
BugTraq ID:36029
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.  Updates are available.

 
 
Description

Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to errors when the vulnerable application processes Embedded OpenType (EOT) fonts by the Win32k.sys kernel driver.  An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website.  If the user visits the site, the attacker could execute arbitrary code with the privileges of the Windows kernel.

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

 
Warning Indicators

The following Microsoft systems are affected:

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

Attackers cannot directly exploit this vulnerability, and instead must rely on user participation.  The attacker must convince the user to view a malicious website, likely by providing links to users within e-mail messages or posted on public websites.  If an exploit is successful, the attacker could execute arbitrary code on the vulnerable system.  Even systems that restrict user privileges may be at risk of complete compromise, because any code execution would run in the privileged context of the Windows kernel.

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

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-065

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the Windows kernel, possibly resulting in a complete system compromise.

 
Technical Information

The vulnerability is due to errors when the vulnerable application processes EOT fonts by the Win32k.sys kernel driver.  EOT fonts may be used in web content.  An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a web page that contains a malicious embedded font.  When processed by the kernel driver, the font could trigger an error condition to enable the attacker to execute code in the privileged security context of the Windows kernel.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Users should verify that unsolicited links are safe to follow.

Administrators are advised to allow only privileged users to access administration or management systems.

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
22080/0Microsoft Windows Kernel-Mode Drivers Remote Code ExecutionS4472009 Nov 10 
 
Alert History
 

Initial Release



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

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

Associated Products:
N/A




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