Check Point Advisories

Microsoft SMB NTLM Authentication Lack of Entropy (MS10-012; CVE-2010-0231)

Check Point Reference: CPAI-2010-029
Date Published: 9 Feb 2010
Severity: High
Last Updated: Tuesday 10 November, 2015
Source:
Industry Reference:CVE-2010-0231
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. An elevation of privilege vulnerability has been reported in the way that Microsoft Server Message Block (SMB) Protocol software handles authentication attempts. The vulnerability is due to a lack of cryptographic entropy when the SMB server generates challenges and presents them to a connecting client. An attacker could trigger this issue by continuously attempting to authenticate against the SMB server and subsequently causing that server to generate duplicate values. This attempt to exploit the vulnerability would not require authentication, allowing an attacker to exploit the vulnerability by sending large amounts of authentication requests to the SMB server. Successful exploitation of this issue may allow the attacker to upload and download files, and access SMB network resources available to the user whose account the attacker is able to access.

Protection Overview

This protection will detect and block malformed SMB requests attempting to exploit this vulnerability.

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 NTLM Authentication Lack of Entropy (MS10-012) 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 NTLM authentication lack of entropy (MS10-012)

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