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Vulnerability Alert

Microsoft Windows WinVerifyTrust Signature Validation Remote Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:25556
Version:1
First Published:2012 April 10 17:26 GMT
Last Published:2012 April 10 17:26 GMT
Port: Not available
CVE:CVE-2012-0151
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 on a targeted system.? Updates are available.

 
 
Description

Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to execute code on the targeted system.

The vulnerability is due to the improper validation of files that are used by the Windows Authenticode Signature Verification function.  An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to run a crafted file or application that is designed to execute arbitrary code on the system.

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

 
Warning Indicators

The following Microsoft products are affected:

  • 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
  • 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

To exploit the vulnerability, the attacker may provide the user with the crafted PE file or convince the user to visit a malicious website that is hosting the crafted PE file. The attacker is likely to use misleading language or instructions to convince the user to open the crafted file or?visit the malicious website.?

The update Microsoft has provided addresses this vulnerably by performing strict Windows Authenticode signature verification when verifying portable executable files.

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

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS12-024

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on an affected system.? The code would execute in the context of the user or the specially-crafted application.? If the user or application has administrative privileges, a complete system compromise could occur.

 
Technical Information

The vulnerability is triggered when a user or application runs a specially crafted, signed portable executable (PE) file on an affected system that is not verified correctly by the WinVerifyTrust function.

An unauthenticated, remote attacker could exploit this vulnerability by modifying an existing signed executable file.? The attacker could modify an existing signed executable file by leveraging an unverified portion of the file in such a way as to add malicious code without invalidating the existing signature of the file.? The attacker would then need to have a user or application run the file on the affected system.? If successful, the attacker could execute arbitrary code in the context of the user or application.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Users are advised not to open unsolicited e-mail attachments. Users should verify that attachments are safe before opening them.

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.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
1130/0Microsoft Windows Malicous Signed Portable Executable FileS6402012 Apr 10 
 
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 2003 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit (Itanium) Base, SP1, SP2 | Datacenter Edition x64 (AMD/EM64T) Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit (Itanium) Base, SP1, SP2 | Enterprise Edition x64 (AMD/EM64T) Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit (Itanium) Base, SP1, SP2 | Standard Edition x64 (AMD/EM64T) Base, SP1, SP2 | Web Edition Base, SP1, SP2
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
Microsoft, Inc.Windows XP Home Edition Base, SP1, SP2, SP3 | Professional Edition Base, SP1, SP2, SP3 | Professional Edition, 64-bit (Itanium) Base, 2003 (itanium 2), SP1, SP2 | Professional x64 (AMD/EM64T) Base, SP1, SP2

Associated Products:
N/A




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