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Vulnerability Alert

Microsoft Windows DirectWrite Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:25328
Version:1
First Published:2012 March 13 17:17 GMT
Last Published:2012 March 13 17:17 GMT
Port: Not available
CVE:CVE-2012-0156
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:4.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.2
 
 
Version Summary:

Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted system.? Updates are available.

 
 
Description

Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.

The vulnerability is due to improper handling of Unicode character sequences.? An unauthenticated, remote attacker could exploit this vulnerability by sending malicious requests to a vulnerable service or by convincing a targeted user to view a malicious document.? If successful, the attacker could cause the targeted application to fail, resulting in a DoS condition.

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

 
Warning Indicators

The following Microsoft systems are affected:

  • 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
  • Windows 7 for 32-bit Systems SP1 and prior
  • Windows 7 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for Itanium-based Systems SP1 and prior
 
IntelliShield Analysis

Only network-aware applications that accept and process Unicode, such as instant messaging clients, are vulnerable to remote exploitation.? Systems without exposed applications may have no vector for remote exploitation and instead require user interaction to accomplish an exploit.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the March 2012 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 March 2012.

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS12-019?

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted network service on the targeted system to fail, resulting in a DoS condition.

 
Technical Information

The vulnerability is due to improper handling of Unicode character sequences by the Microsoft DirectWrite API.

An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to view a malicious document that contains Unicode characters or by sending requests to network services that accept Unicode.? The processing of the Unicode character sequences could cause an error condition that could cause the application or service to terminate, resulting in a DoS condition.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators may consider periodically clearing the DNS Server cache.

Administrators are advised to monitor affected 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.

 
Alert History
 

Initial Release



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

Primary Products:
Microsoft, Inc.Windows 7 for 32-bit systems Base, SP1 | for x64-based systems Base, SP1
Microsoft, Inc.Windows Server 2008 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit Base, SP1, SP2 | Itanium-Based Systems Edition Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit Base, SP1, SP2 | Essential Business Server Standard Base, SP1, SP2 | Essential Business Server Premium Base, SP1, SP2 | Essential Business Server Premium, 64-bit Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit Base, SP1, SP2 | Web Server Base, SP1, SP2 | Web Server, 64-bit Base, SP1, SP2
Microsoft, Inc.Windows Server 2008 R2 x64-Based Systems Edition Base, SP1 | Itanium-Based Systems Edition Base, SP1
Microsoft, Inc.Windows Vista Home Basic Base, SP1, SP2 | Home Premium Base, SP1, SP2 | Business Base, SP1, SP2 | Enterprise Base, SP1, SP2 | Ultimate Base, SP1, SP2 | Home Basic x64 Edition Base, SP1, SP2 | Home Premium x64 Edition Base, SP1, SP2 | Business x64 Edition Base, SP1, SP2 | Enterprise x64 Edition Base, SP1, SP2 | Ultimate x64 Edition Base, SP1, SP2

Associated Products:
N/A




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