Check Point Advisories

Microsoft Windows SMB Server SMBv1 Out of Bounds Read (CVE-2017-11781)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0867
Date Published:	23 Oct 2017
Severity:	High
Last Updated:	Thursday 26 October, 2017
Source:	Microsoft
Industry Reference:	CVE-2017-11781
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Windows 7 Microsoft Windows 8.1 Microsoft Windows RT 8.1 Microsoft Windows 10 Microsoft Windows Server 2008 Microsoft Windows Server 2012 Microsoft Windows Server 2016
Vulnerability Description	An out of bounds read vulnerability exists in the SMB Server component of Microsoft Windows. The vulnerability is due to improper handling of SMBv1 requests. A remote, authenticated attacker could exploit the vulnerability by sending a crafted SMBv1 request to a target SMB server.

Protection Overview

This protection detects attempts 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

In the IPS tab, click Protections and find the Microsoft Windows SMB Server SMBv1 Out of Bounds Read (CVE-2017-11781) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Windows SMB Protection Violation.
Attack Information: Microsoft Windows SMB Server SMBv1 Out of Bounds Read (CVE-2017-11781)