Microsoft .NET Framework contains a vulnerability that could allow an unauthenticated, remote attacker to gain elevated privileges on a targeted system.
The vulnerability is due to improper validation of user supplied input processed by the affected software. An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to visit a malicious website. If successful, the attacker could gain elevated privileges on a targeted system.
Microsoft confirmed the vulnerability in a security bulletin and released software updates.
Indicators of Compromise
Microsoft .NET Framework 2.0 SP2, 3.0 SP2, 3.5, 3.5.1, 4, and 4.5 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 8 for 32-bit Systems
Windows 8 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems SP1 and prior
Windows Server 2008 R2 for Itanium-based Systems SP1 and prior
Windows Server 2012
The vulnerability is in the System.DirectoryServices.Protocols in the SortRequestControl.GetValue() method used by the affected software, which allocates an array based on the value of the parameter this.keys.Length and then uses a loop terminated by the same parameter to fill the array with data.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to view a web page that contains crafted Extensible Application Markup Language (XAML) browser application (XBAP). Processing the web page could change the value of this.keys.Length between the array creation and loop. This condition could lead to a heap-based buffer overflow, allowing the attacker to execute arbitrary code on the system under the context of the affected software.
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 validates the size of an array prior to copying objects in memory.
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: MS13-004
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.