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Vulnerability Alert

Microsoft .NET Framework Web Proxy Auto-Discovery Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:27358
Version:1
First Published:2012 November 13 13:27 GMT
Last Published:2012 November 13 18:27 GMT
Port: Not available
CVE:CVE-2012-4776
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 SignatureView related Applied Mitigation BulletinView related Event Response
 
 
Version Summary:Microsoft .NET Framework contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. Updates are available.
 
 
Description
Microsoft .NET Framework contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to improper handling of user-supplied data processed by the .NET Framework. An unauthenticated, remote attacker could exploit the vulnerability by persuading a user to use a crafted proxy autoconfiguration file. If successful, the attacker could inject arbitrary code into the application currently running on the system with the privileges of the user. If the user holds elevated privileges, the attacker could gain complete control of the system.

Microsoft confirmed the vulnerability in a security bulletin and released software updates.
 
Warning Indicators
Microsoft .NET Framework versions 2.0 SP2 and 4 when installed on the following:
  • Windows XP SP3, Professional x64 Edition SP2
  • Windows Server 2003 SP2, x64 Edition SP2 and for Itanium-based Systems SP2
  • Windows Vista SP2 and x64 Edition SP2
  • Windows Server 2008 (32-bit, x64 and Itanium) SP2
  • Windows 7 for (32-bit and x64) SP1 and prior (Microsoft .NET Framework 4 only)
  • Windows Server 2008 R2 (x64 and Itanium) SP1 and prior (Microsoft .NET Framework 4 only)
Microsoft .NET Framework 3.5 when installed on the following:
  • Windows 8 (32-bit and x64)
  • Windows Server 2012
  • Windows RT
Microsoft .NET Framework 3.5.1 when installed on the following:
  • Windows 7 for (32-bit and x64) SP1 and prior
  • Windows Server 2008 R2 (x64 and Itanium) SP1 and prior
Microsoft .NET Framework 4.5 when installed on the following:
  • Windows Vista SP2 and x64 Edition SP2
  • Windows Server 2008 for x64-based Systems SP2
  • Windows 7 for (32-bit and x64) SP1
  • Windows Server 2008 R2 for x64-based Systems SP1
  • Windows 8 (32-bit and x64)
  • Windows Server 2012
  • Windows RT
  • Windows Server 2012
 
IntelliShield Analysis
To exploit the vulnerability, the attacker may provide a link that directs a user to a file and use misleading language or instructions to persuade the user to follow the provided link.

Microsoft has corrected this vulnerability by modifying the way the Microsoft .NET Framework processes default web proxy settings.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the November 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 November 2012
 
Vendor Announcements
Microsoft has released a security bulletin at the following link: MS12-074
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on a targeted system with the privileges of the targeted user. If the user holds elevated privileges, the attacker could gain complete control of the system.
 
Technical Information
The vulnerability is due to insufficient validation of default web proxy settings processed by the .NET Framework.

An unauthenticated, remote attacker could exploit the vulnerability by persuading a user to use a crafted proxy autoconfiguration file. When the malicious file is processed by the .Net Framework, the lack of input validation could allow the attacker to inject arbitrary code into the application currently running on the system with the privileges of the user. If the user holds elevated privileges, the attacker could gain complete control of the system.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to review mitigation steps in the Microsoft advisory.

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.

Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.

Administrators are advised to monitor affected systems
.
 
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 Microsoft Update service. 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..NET Framework 2.0 SP2 | 3.5 Base | 3.5.1 Base | 4.0 Base | 4.5 Base

Associated Products:
Microsoft, Inc.Windows 7 for 32-bit systems Base, SP1 | for x64-based systems Base, SP1
Microsoft, Inc.Windows RT Original Release Base
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 Server 2008 Datacenter Edition SP2 | Datacenter Edition, 64-bit SP2 | Itanium-Based Systems Edition SP2 | Enterprise Edition SP2 | Enterprise Edition, 64-bit SP2 | Essential Business Server Standard SP2 | Essential Business Server Premium SP2 | Essential Business Server Premium, 64-bit SP2 | Standard Edition SP2 | Standard Edition, 64-bit SP2 | Web Server SP2 | Web Server, 64-bit SP2
Microsoft, Inc.Windows Server 2008 R2 x64-Based Systems Edition Base, SP1 | Itanium-Based Systems Edition Base, SP1
Microsoft, Inc.Windows Server 2012 Original Release Base
Microsoft, Inc.Windows Vista Home Basic SP2 | Home Premium SP2 | Business SP2 | Enterprise SP2 | Ultimate SP2 | Home Basic x64 Edition SP2 | Home Premium x64 Edition SP2 | Business x64 Edition SP2 | Enterprise x64 Edition SP2 | Ultimate x64 Edition SP2
Microsoft, Inc.Windows XP Home Edition SP3 | Professional Edition SP3 | Professional x64 (AMD/EM64T) SP2 | Tablet PC Edition SP3 | Media Center Edition SP3
Microsoft, Inc.Windows 8 for 32-bit systems Base | for x64-based systems Base




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