Microsoft .NET Framework contains a vulnerability that could allow an unauthenticated, remote attacker to access sensitive information on a targeted system. Updates are available.
Microsoft .NET Framework contains a vulnerability that could allow an unauthenticated, remote attacker to access sensitive information.
The vulnerability is due to improper handling of output data processed by the .NET Framework. An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to visit a malicious website. If successful, the attacker could access sensitive information on the targeted system or bypass Code Access Security (CAS) restrictions.
Microsoft confirmed the vulnerability in a security bulletin and released software updates.
The following Microsoft products are affected:
Microsoft .NET Framework 2.0 SP2 when installed on the following:
Windows XP SP3 and 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
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
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site 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 handles the sanitation of function output based on the calling codes level of trust.
Microsoft has released a security bulletin at the following link: MS12-074
An unauthenticated, remote attacker could exploit this vulnerability to access sensitive information on a targeted system. The attacker could use the information to launch additional attacks.
The vulnerability is due to insufficient sanitation of a certain function output when the function is called from partially trusted code.
An unauthenticated, remote attacker could exploit the vulnerability by hosting an Extensible Application Markup Language (XAML) browser application (XBAP) and persuading a user to visit the malicious website. When the malicious XBAP is processed, an error condition may occur that the attacker could use to access sensitive information on the targeted system or bypass CAS restrictions. The attacker could use the information to launch additional attacks.
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 disabling XAML browser applications in Internet Explorer.
Administrators may consider adding trusted sites to the Internet Explorer Trusted sites zone.
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 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
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
Home Edition SP3 | Professional Edition SP3 | Professional x64 (AMD/EM64T) SP2 | Tablet PC Edition SP3 | Media Center Edition SP3
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