Race condition in Mozilla Firefox - CVE-2021-24000
Published: April 19, 2021
Vulnerability identifier: #VU52339
CSH Severity: Medium
CVSS v4: 5.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-24000
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform clickjacking attack.
The vulnerability exists due to a race condition within requestPointerLock() and setTimeout() methods in conjunctions with certain elements, such as <input type="file">. A remote attacker can create a specially crafted web page that will result in a situation where a user interacting with one tab when they believed they were on a separate tab and gain access to sensitive information.
Affected software
Mozilla Firefox
Arch Linux
Ubuntu
firefox (Ubuntu package)
Arch Linux
Ubuntu
firefox (Ubuntu package)
How to mitigate CVE-2021-24000
Install updates from vendor's website.
Mozilla Firefox - update to 88.0
firefox (Ubuntu package) - addressed in versions 88.0+build2-0ubuntu0.16.04.1, 88.0+build2-0ubuntu0.18.04.2, 88.0+build2-0ubuntu0.20.04.1, 88.0+build2-0ubuntu0.20.10.1, 88.0+build2-0ubuntu0.21.04.1
firefox (Ubuntu package) - addressed in versions 88.0+build2-0ubuntu0.16.04.1, 88.0+build2-0ubuntu0.18.04.2, 88.0+build2-0ubuntu0.20.04.1, 88.0+build2-0ubuntu0.20.10.1, 88.0+build2-0ubuntu0.21.04.1