Check Point Advisories

Microsoft Active Directory Memory Leak Denial of Service (MS09-018; CVE-2009-1139)

Check Point Reference: CPAI-2009-156
Date Published: 28 Jun 2009
Severity: High
Last Updated: Sunday 07 February, 2016
Source:
Industry Reference:CVE-2009-1139
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description Active Directory provides central authentication and authorization services for Windows-based systems. Active Directory Application Mode (ADAM) is a Lightweight Directory Access Protocol (LDAP) directory service that runs as a user service. A denial of service vulnerability has been reported in Microsoft Active Directory. The vulnerability is due to improper memory management during execution of certain types of LDAP or LDAPS requests. The LDAP service improperly manages memory while executing LDAP or LDAPS requests which contain specific Object Identifier (OID) filters, which are used to name an LDAP object. A remote attacker may trigger this issue by sending a specially crafted LDAP or LDAPS packet to the ADAM or to an Active Directory server. Successful exploitation of this issue could create a denial of service condition, causing the system to become non-responsive.

Protection Overview

This protection will detect and block malformed LDAP requests sent to the vulnerable server.

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 Active Directory Memory Leak Denial of Service (MS09-018) 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:  LDAP Protection Violation.
Attack Information:  Microsoft Active Directory memory leak denial of service (MS09-018)

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