Check Point Advisories

Mozilla Firefox URL Long user name Denial Of Service (CVE-2017-7783)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0887
Date Published:	26 Oct 2017
Severity:	Medium
Last Updated:	Thursday 23 November, 2017
Source:	Mozilla
Industry Reference:	CVE-2017-7783
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Mozilla Firefox prior to 55
Vulnerability Description	A denial-of-service vulnerability exists in Mozilla Firefox. Mozilla Firefox fails to properly process a combination of username and password inside the URL. A remote attacker could exploit this vulnerability by persuading a target user to open a specially crafted html site.

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 Mozilla Firefox URL Long user name 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: Web Client Enforcement Violation.
Attack Information: Mozilla Firefox URL Long user name Denial Of Service