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Vulnerability Alert

Microsoft Windows Embedded OpenType Font Heap Overflow Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:18614
Version:2
First Published:2009 July 14 18:10 GMT
Last Published:2009 July 16 14:32 GMT
Port: Not available
CVE:CVE-2009-0231
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 regarding the Microsoft Windows Embedded OpenType font heap overflow vulnerability.

 
 
Description

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

This vulnerability exists due to insufficient boundary restrictions by the Embedded OpenType Font Engine.? 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 updated software.

 
Warning Indicators

The following Microsoft products are affected:

  • 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 SP2 and prior
  • Windows Vista SP2 and prior
  • Windows Vista x64 Edition SP2 and prior
  • Windows Server 2008 for 32-bit Systems SP2 and prior
  • Windows Server 2008 for x64-based Systems SP2 and prior
  • Windows Server 2008 for Itanium-based Systems SP2 and prior
 
IntelliShield Analysis

Attackers cannot directly exploit this vulnerability and instead rely upon user participation.  Attackers may embed malicious content within public websites or attempt to convince users to visit malicious sites by sending links in e-mail messages.  An attacker may rely upon social engineering techniques to convince users to participate in an exploit.

Systems most at risk are end-user systems on which users run applications with elevated privileges.  If the user holds elevated privileges, an exploit could result in a complete system compromise.  Systems that restrict user privileges or those with built-in privilege separation could be impacted less as the result of an exploit because any executed code would run with limited privileges.

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

The update available from Microsoft corrects this vulnerability by improving font parsing.

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-029

 
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 completely compromise the vulnerable system.

 
Technical Information

This vulnerability exists due to insufficient boundary restrictions by the Embedded OpenType Font Engine.  Specifically, the vulnerability exists in the t2embed.dll library due to an integer truncation error.  The affected component fails to properly limit the size of input within name tables when processing malformed embedded fonts.  The processing of an overly large parameter could trigger a heap-based buffer overflow, possibly corrupting memory.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a website that contains a malicious embedded font.  The processing of the website could trigger memory corruption that 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 may consider disabling embedded fonts in Internet Explorer.

Administrators may consider unregistering or preventing access to the t2embed.dll component.

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.

 
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
19381/0Embedded OpenType Font Heap Overflow VulnerabilityS4142009 Jul 14 
19381/1Embedded OpenType Font Heap Overflow VulnerabilityS5002010 Jul 13 
 
Alert History
 

Version 1, July 14, 2009 2:10 PM:  Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.  Updates are available.



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 | Datacenter 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 Server 2008 Datacenter Edition Base | Datacenter Edition, 64-bit Base | Itanium-Based Systems Edition Base | Enterprise Edition Base | Enterprise Edition, 64-bit Base | Essential Business Server Standard Base | Essential Business Server Premium Base | Essential Business Server Premium, 64-bit Base | Standard Edition Base | Standard Edition, 64-bit Base | Web Server Base | Web Server, 64-bit Base
Microsoft, Inc.Windows Vista Home Basic Base, SP1 | Home Premium Base, SP1 | Business Base, SP1 | Enterprise Base, SP1 | Ultimate Base, SP1 | Home Basic x64 Edition Base, SP1 | Home Premium x64 Edition Base, SP1 | Business x64 Edition Base, SP1 | Enterprise x64 Edition Base, SP1 | Ultimate x64 Edition Base, SP1
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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