Resource management error in Mozilla Firefox - CVE-2019-11747
Published: September 3, 2019
Vulnerability identifier: #VU20833
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-11747
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability makes HSTS feature ineffective.
The vulnerability exists due to incorrect implementation of the "Forget about this site" feature in the History pane, intended to remove all saved user data that indicates a user has visited a site. This includes removing any HTTP Strict Transport Security (HSTS) settings received from sites that use it. Due to a bug, sites on the pre-load list also have their HSTS setting removed. On the next visit to that site if the user specifies an http: URL rather than secure https: they will not be protected by the pre-loaded HSTS setting. After that visit the site's HSTS setting will be restored.
Affected software
Mozilla Firefox
Firefox ESR
Arch Linux
Red Hat Enterprise Linux for x86_64
firefox (Ubuntu package)
Firefox ESR
Arch Linux
Red Hat Enterprise Linux for x86_64
firefox (Ubuntu package)
How to mitigate CVE-2019-11747
Install updates from vendor's website.
Mozilla Firefox - update to 69.0
firefox (Ubuntu package) - addressed in versions 69.0+build2-0ubuntu0.16.04.4, 69.0+build2-0ubuntu0.18.04.1, 69.0+build2-0ubuntu0.19.04.1, 69.0.2+build1-0ubuntu0.16.04.1, 69.0.2+build1-0ubuntu0.18.04.1, 69.0.2+build1-0ubuntu0.19.04.1
Firefox ESR - update to 68.1.0
firefox (Ubuntu package) - addressed in versions 69.0+build2-0ubuntu0.16.04.4, 69.0+build2-0ubuntu0.18.04.1, 69.0+build2-0ubuntu0.19.04.1, 69.0.2+build1-0ubuntu0.16.04.1, 69.0.2+build1-0ubuntu0.18.04.1, 69.0.2+build1-0ubuntu0.19.04.1
Firefox ESR - update to 68.1.0