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Check Point Advisories

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

Check Point Reference: CPAI-2017-0887
Date Published: 26 Oct 2017
Severity: Medium
Last Updated: 23 Nov 2017
Source: Mozilla
Industry Reference:CVE-2017-7783
Protection Provided by:

Security Gateway
R80, R77, R76, 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 / R76 / R75

  1. 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.
  2. Install policy on all modules.

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