Check Point Advisories

Microsoft SMB Crafted Write Request Denial of Service (MS11-048; CVE-2011-1267)

Check Point Reference: CPAI-2011-295
Date Published: 5 Jun 2011
Severity: High
Last Updated: Tuesday 15 August, 2023
Source:
Industry Reference:CVE-2011-1267
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 denial of service vulnerability exists in the way that Microsoft Server Message Block (SMB) Protocol software handles specially crafted SMB requests. The vulnerability is caused when the Microsoft Server Message Block (SMB) Protocol software improperly handles specially crafted SMB Write requests. A remote attacker could exploit this flaw by constructing a specially crafted SMB packet and sending it to a target server. Successful exploitation could cause a denial of service condition on the affected 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 R81 / R80 / R77 / R75 / R71 / R70 / R65

  1. In the IPS tab, click Protections and find the Microsoft SMB Crafted Write Request Denial of Service (MS11-048) 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 Denial of Service (MS11-048)

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