Check Point Advisories

Ruby on Rails Active Storage Insecure Deserialization (CVE-2019-5420)

Vulnerability
Protection

Check Point Reference:	CPAI-2019-0784
Date Published:	26 Jun 2019
Severity:	Critical
Last Updated:	Wednesday 26 June, 2019
Source:
Industry Reference:	CVE-2019-5420
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Development mode Rails <5.2.2.1, <6.0.0.beta3
Vulnerability Description	An insecure deserialization vulnerability exists in Ruby on Rails' ActiveStorage component. Successful exploitation of this vulnerability could allow a remote authenticated attacker with at least author-level privileges to execute arbitrary code on the affected system.

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 Ruby on Rails Active Storage Insecure Deserialization (CVE-2019-5420) 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: Ruby on Rails Active Storage Insecure Deserialization (CVE-2019-5420)