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 external dynamic-link library (DLL) files by the .NET Framework. An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to open a malicious .NET application. If successful, the attacker could execute arbitrary code on the system with the privileges of the user.
Microsoft confirmed the vulnerability in a security bulletin and released software updates.
Indicators of Compromise
The following Microsoft products are affected:
Microsoft .NET Framework 1.0 SP3 when installed on the following:
Windows XP Tablet PC Edition 2005 SP3
Windows XP Media Center Edition 2005 SP3
Microsoft .NET Framework versions 1.1 SP1, 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 (.NET Framework versions 3.5.1 and 4 only)
Windows Server 2008 R2 (x64 and Itanium) SP1 and prior (.NET Framework versions 3.5.1 and 4 only)
Microsoft .NET Framework 3.5 when installed on the following:
Windows 8 (32-bit and x64)
Windows Server 2012
The vulnerability exists because the Entity Framework, which is a component of the affected software and is built with ADO.NET, enforces incorrect path restrictions when loading external libraries.
An unauthenticated, remote attacker could exploit the vulnerability by hosting a crafted DLL in a network directory that also contains an application that is built with ADO.NET and convincing a user to open the .NET application. When the application is executed, it may attempt to load the malicious DLL and execute any code it contains. A successful exploit could allow the attacker to execute arbitrary code on the system with the privileges of the user. If the user holds elevated privileges, the attacker could gain complete control over the system.
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. The attacker may require access to a network directory to place the crafted DLL. This requirement may reduce the likelihood of a successful exploit.
Microsoft has corrected this vulnerability by modifying the way the Microsoft .NET Framework loads external DLLs.
Administrators are advised to apply the appropriate updates.
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
Microsoft has released a security bulletin at the following link: MS12-074
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.
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)
Windows Server 2008 R2
x64-Based Systems Edition (Base, SP1) | Itanium-Based Systems Edition (Base, SP1)
Windows Server 2012
Original Release (Base)
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)
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.