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 on a targeted system.
The vulnerability is due to the way the .NET Framework handles pointers to unmanaged memory locations. An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to visit a malicious website. If successful, the attacker could bypass Code Access Security (CAS) restrictions to obtain sensitive information stored in unmanaged memory locations.
Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
Microsoft .NET Framework 1.0 SP3, 1.1 SP1, 2.0 SP2, 3.0 SP2, and 4 are vulnerable when running on the following systems:
Windows XP SP3
Windows XP Professional x64 Edition SP2
Windows Server 2003 SP2
Windows Server 2003 x64 Edition SP2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista SP2
Windows Vista x64 Edition SP2
Windows Server 2008 for 32-bit Systems SP2
Windows Server 2008 for x64-based Systems SP2
Windows Server 2008 for Itanium-based Systems SP2
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
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 correcting how the .NET Framework initializes memory arrays.
Microsoft has released a security bulletin at the following link: MS13-004
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 the way the .NET Framework handles pointers to unmanaged memory locations. As a result, the affected software fails to initialize the contents of a memory array.
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 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 x64 (AMD/EM64T) SP2 | Tablet PC Edition 2005, SP3 | Media Center Edition 2005, SP3
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