Check Point Advisories

Microsoft Workstation Service NetrGetJoinInformation Corruption (MS09-041; CVE-2009-1544)

Check Point Reference: CPAI-2009-155
Date Published: 11 Aug 2009
Severity: High
Last Updated: Wednesday 29 April, 2015
Source:
Industry Reference:CVE-2009-1544
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description Microsoft Windows Workstation Service routes local file system requests and remote file or print network requests via Remote Procedure Call (RPC). RPC is a protocol that a program can use to request a service from another program which is located on another computer in a network. An elevation of privilege vulnerability has been reported in the Microsoft Windows Workstation Service. The vulnerability is due to a possible "Double Free" condition occurring in the service. The "Double Free" condition occurs when an attacker could cause an affected system, while processing a specially crafted program, to try to release or "free" memory that may have been set aside for use multiple times. Releasing memory that has already been freed could lead to memory corruption. The Windows Workstation Service fails to properly allocate and free memory when receiving specially crafted RPC messages. A remote attacker can exploit this issue by specially crafting a malicious RPC request and sending it an affected system, causing the NetrGetJoinInformation routine to incorrectly free a heap pointer. Successful exploitation may allow the attacker to take complete control of a target system.

Protection Overview

This protection will detect and block malformed RPC requests sent to the vulnerable service.

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

  1. In the IPS tab, click Protections and find the Microsoft Workstation Service NetrGetJoinInformation Corruption (MS09-041) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  MS-RPC over CIFS Enforcement Violation.
Attack Information:  Microsoft Workstation Service NetrGetJoinInformation corruption (MS09-041)

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