IntelliShield has updated this alert to report a decrease in intrusion prevention system activity that is related to the Microsoft SharePoint Server inplview.aspx cross-site scripting vulnerability.
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. 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
Microsoft SharePoint Foundation 2010 SP1 and prior is vulnerable.
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.
Event data from Cisco Remote Management Services has detected intrusion prevention system signature activity related to this vulnerability. The data, which was captured on March 15, 2012, could indicate that exploits are no longer occurring in the wild.
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, possibly including user authentication credentials.
Technical Information
The vulnerability is due to improper validation of user-supplied input to the inplview.aspx script of Microsoft SharePoint.
An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to follow a malicious URL. When followed, the URL could send malicious input to the application. The application fails to check supplied parameters before returning the input to the user's browser session, where the parameters may execute in the security context of the affected site.
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
Version 4, March 6, 2012, 10:21 AM: IntelliShield has updated this alert to report an increase in intrusion prevention system activity that is related to the Microsoft SharePoint Server inplview.aspx cross-site scripting vulnerability.
Version 3, February 23, 2012, 1:39 PM: IntelliShield has updated this alert to report an increase in intrusion prevention system activity that is related to the Microsoft SharePoint Server inplview.aspx cross-site scripting vulnerability.
Version 2, February 21, 2012, 9:26 AM: IntelliShield has updated this alert to report an increase in intrusion prevention system activity that is related to the Microsoft SharePoint Server inplview.aspx cross-site scripting vulnerability.
Version 1, February 14, 2012, 1:23 PM: Microsoft SharePoint contains a vulnerability that could allow an unauthenticated, remote attacker to conduct cross-site scripting vulnerabilities. Updates are available.
The security vulnerability applies to the following combinations of products.
Primary Products:
Microsoft, Inc.
SharePoint Foundation
2010 Base, SP1
Associated Products:
N/A
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