Check Point Advisories

Microsoft SMB Infinite Loop Denial of Service (MS09-050; CVE-2009-2526)

Check Point Reference: CPAI-2009-212
Date Published: 13 Oct 2009
Severity: High
Last Updated: Tuesday 18 February, 2014
Source:
Industry Reference:CVE-2009-2526
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description The SMB Protocol is a network file sharing protocol that is implemented in Microsoft Windows. A denial of service vulnerability has been reported in the way that Microsoft Server Message Block (SMB) Protocol software handles specially crafted SMB version 2 (SMBv2) packets. The vulnerability is due to an error in the Microsoft Server Message Block (SMB) implementation that fails to sufficiently validate all fields when parsing specially crafted SMBv2 packets. A remote attacker could exploit this flaw via a specially crafted network message. Successful exploitation could cause a denial of service condition on the target system.

Protection Overview

This protection will detect and block malformed SMBv2 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 SMB Infinite Loop Denial of Service (MS09-050) 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 SMB infinite loop denial of service (MS09-050)

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