Check Point Advisories

Develar SnakeYAML Entity Expansion (CVE-2017-18640)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-1224
Date Published:	17 May 2022
Severity:	High
Last Updated:	Tuesday 17 May, 2022
Source:
Industry Reference:	CVE-2017-18640
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	SnakeYAML 1.18
Vulnerability Description	An entity expansion vulnerability exists in Develar SnakeYAML. Successful exploitation of this vulnerability would allow remote attackers to cause the affected system to crash or become unresponsive.

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 R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Develar SnakeYAML Entity Expansion (CVE-2017-18640) 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: Web Server Enforcement Violation.
Attack Information: Develar SnakeYAML Entity Expansion (CVE-2017-18640)