Permissions, Privileges, and Access Controls in Mozilla Firefox - CVE-2019-11765
Published: October 23, 2019
Vulnerability identifier: #VU22169
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-11765
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass certain security restrictions.
The vulnerability exists due to the way Firefox handles messages to the parent process that trigger the 'Click to Play' permission prompt to be shown. A remote attacker can create a specially crafted web page and assign arbitrary permissions instead of 'Click to Play' permission, if the user accepted the permission request.
Affected software
Mozilla Firefox
Arch Linux
firefox (Ubuntu package)
firefox (Alpine package)
Arch Linux
firefox (Ubuntu package)
firefox (Alpine package)
How to mitigate CVE-2019-11765
Install updates from vendor's website.
Mozilla Firefox - update to 70.0
firefox (Ubuntu package) - addressed in versions 70.0+build2-0ubuntu0.16.04.1, 70.0+build2-0ubuntu0.18.04.1, 70.0+build2-0ubuntu0.19.04.1, 70.0+build2-0ubuntu0.19.10.1
firefox (Ubuntu package) - addressed in versions 70.0+build2-0ubuntu0.16.04.1, 70.0+build2-0ubuntu0.18.04.1, 70.0+build2-0ubuntu0.19.04.1, 70.0+build2-0ubuntu0.19.10.1