Check Point Advisories

Microsoft WINS Buffer Length Heap Overflow (MS09-039; CVE-2009-1923)

Check Point Reference: CPAI-2009-145
Date Published: 11 Aug 2009
Severity: Critical
Last Updated: Tuesday 11 August, 2009
Source:
Industry Reference:CVE-2009-1923
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description Windows Internet Naming Service (WINS) was designed specifically to support NetBIOS over TCP/IP (NetBT), and is required for any environment in which users access resources that have NetBIOS names. A remote code execution vulnerability has been discovered in Microsoft WINS. The vulnerability is due to the manner in which WINS calculates a buffer length when processing specially crafted WINS network packets. An attacker can trigger this issue by sending a specially crafted network packet to an affected WINS server. Successful exploitation of the vulnerability may allow the attacker to execute arbitrary code on the vulnerable system.

Protection Overview

This protection will detect and block malformed WINS network packets.

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 WINS Buffer Length Heap Overflow (MS09-039) 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:  Windows SMB Protection Violation.
Attack Information:  Microsoft WINS buffer length heap overflow (MS09-039)

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