Microsoft SharePoint contains a vulnerability that could allow an unauthenticated, remote attacker to conduct cross-site scripting vulnerabilities. Updates are available.
Description
Microsoft SharePoint contains a vulnerability that could allow an unauthenticated, remote attacker to conduct cross-site scripting vulnerabilities.
The vulnerability is due to improper validation of user-supplied input to the SharePoint Server. An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to visit a malicious site. If successful, the attacker could execute arbitrary script or HTML content in the user's browser.
Microsoft confirmed the vulnerability in a security bulletin and released software updates.
Warning Indicators
The following Microsoft products are affected:
Microsoft Office SharePoint Server 2010 SP1 and prior
Microsoft SharePoint Foundation 2010 SP1 and prior
IntelliShield Analysis
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.
The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the February 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 February 2012.
Vendor Announcements
Microsoft has released a security bulletin at the following link: MS12-011
Impact
An unauthenticated, remote attacker could exploit this vulnerability to access sensitive browser-based information, which could include user authentication credentials.
Technical Information
The vulnerability is due to improper validation of user-supplied input to the themeweb.aspx script of SharePoint before returning input to the user.
An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to follow a link that is designed to send malicious input to the vulnerable script. When processing the supplied data, the application may return unsanitized values to the user rendered in the security context of the affected site. The attacker could include malicious script or HTML code that, when executed, could allow the attacker to access sensitive browser-based information.
Safeguards
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.
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 Windows Update website. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.
Signatures
Cisco Systems Cisco Intrusion Prevention System (IPS) 6.0
The security vulnerability applies to the following combinations of products.
Primary Products:
Microsoft, Inc.
Office SharePoint Server
2010 Base, SP1
Microsoft, Inc.
SharePoint Foundation
2010 Base, SP1
Associated Products:
N/A
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