Check Point Advisories

Microsoft Windows CSRSS LPC_PORT_CLOSED Information Disclosure (MS11-010; CVE-2011-0030)

Vulnerability
Protection

Check Point Reference:	CPAI-2011-080
Date Published:	10 Mar 2011
Severity:	High
Last Updated:	Thursday 10 March, 2011
Source:
Industry Reference:	CVE-2011-0030
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description	The Client/Server Run-time Subsystem (CSRSS) is the user-mode portion of the Win32 subsystem. CSRSS is an essential subsystem that must be running at all times. CSRSS is responsible for console windows, and creating and/or deleting threads. An elevation of privilege vulnerability has been reported in the way that the Windows Client/Server Run-time Subsystem (CSRSS) terminates a process when a user logs off. The vulnerability is due to the way that the Windows CSRSS processes LPC_PORT_CLOSED from user processes. This would allow malicious processes to stay running when the user has logged out of the system. A local attacker can exploit this issue to keep the process running while logged out, potentially allowing information disclosure.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75 / R71 / R70 / R65

In the IPS tab, click Protections and find the Microsoft Windows CSRSS LPC_PORT_CLOSED Information Disclosure (MS11-010) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Content Protection Violation.
Attack Information: Microsoft Windows CSRSS LPC_PORT_CLOSED information disclosure (MS11-010)