Spoofing attack in Mozilla Firefox - CVE-2021-29975
Published: July 13, 2021
Vulnerability identifier: #VU54684
CSH Severity: Medium
CVSS v4 BT: 1.2 [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/E:U/U:Green]
CVE-ID: CVE-2021-29975
CWE-ID: CWE-451
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data. Through a series of DOM manipulations, a message, over which the attacker had control of the text but not HTML or formatting, could be overlaid on top of another domain (with the new domain correctly shown in the address bar) resulting in possible user confusion.
Affected software
Mozilla Firefox
Arch Linux
Gentoo Linux
Ubuntu
firefox (Ubuntu package)
Arch Linux
Gentoo Linux
Ubuntu
firefox (Ubuntu package)
How to mitigate CVE-2021-29975
Install updates from vendor's website.
Mozilla Firefox - update to 90.0
firefox (Ubuntu package) - addressed in versions 90.0+build1-0ubuntu0.18.04.1, 90.0+build1-0ubuntu0.20.04.1, 90.0+build1-0ubuntu0.20.10.1, 90.0+build1-0ubuntu0.21.04.1
firefox (Ubuntu package) - addressed in versions 90.0+build1-0ubuntu0.18.04.1, 90.0+build1-0ubuntu0.20.04.1, 90.0+build1-0ubuntu0.20.10.1, 90.0+build1-0ubuntu0.21.04.1