Check Point Advisories

Microsoft SMB Crafted Write Request Remote Code Execution (MS11-020; CVE-2011-0661)

Check Point Reference: CPAI-2011-225
Date Published: 6 Apr 2011
Severity: Critical
Last Updated: Tuesday 10 November, 2015
Source:
Industry Reference:CVE-2011-0661
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description SMB Protocol is the file sharing protocol used by default on Windows-based computers. A remote code execution vulnerability has been reported in the way that Microsoft Server Message Block (SMB) Protocol software handles specially crafted SMB packets. The vulnerability is due to a pool corruption when SMB2 fails to properly parse write requests. A remote attacker may exploit this issue by sending a specially crafted SMB packet to a computer running the Server service. Successful exploitation may allow execution of arbitrary code on a vulnerable system.

Protection Overview

This protection will detect and block malicious SMB2 write requests.

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 Crafted Write Request Remote Code Execution (MS11-020) 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 Crafted Write Request remote code execution (MS11-020)

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