Check Point Advisories

Microsoft Windows SMB Server Information Disclosure (CVE-2020-17140)

Vulnerability
Protection

Check Point Reference:	CPAI-2020-1272
Date Published:	8 Dec 2020
Severity:	High
Last Updated:	Tuesday 08 December, 2020
Source:
Industry Reference:	CVE-2020-17140
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Windows 8.1 Microsoft Windows RT 8.1 Microsoft Windows 10 Microsoft Windows Server 2012 Microsoft Windows Server 2012 R2 Microsoft Windows Server 2016 Microsoft Windows Server 2019 Microsoft Windows Server version 1903 (Server Core installation) Microsoft Windows Server version 1909 (Server Core installation) Microsoft Windows Server version 2004 (Server Core installation) Microsoft Windows Server version 20H2 (Server Core installation)
Vulnerability Description	An information disclosure vulnerability has been reported in the SMBv2 component of Microsoft Windows SMB server. The vulnerability is due to improper handling of SMB2_SET_INFO messages. A remote, authenticated attacker can exploit this vulnerability by sending crafted SMBv2 messages to the target 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 Information Disclosure (CVE-2020-17140) 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 Information Disclosure (CVE-2020-17140)