Check Point Advisories

OpenSSH sftp-server.c Denial of Service (CVE-2017-15906)

Vulnerability
Protection

Check Point Reference:	CPAI-2019-0210
Date Published:	18 Feb 2019
Severity:	Medium
Last Updated:	Wednesday 27 February, 2019
Source:	OpenSSH
Industry Reference:	CVE-2017-15906
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	OpenSSH OpenSSH prior to 7.6
Vulnerability Description	A denial of service vulnerability has been reported in OpenSSH. The vulnerability is due to improper restriction of write access when in read-only mode within sftp-server.c. A remote attacker could exploit this vulnerability by sending crafted requests to a vulnerable 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 OpenSSH sftp-server.c Denial of Service 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: SSH Protection Violation.
Attack Information: OpenSSH sftp-server.c Denial of Service