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CVE-2021-43531

Published: 8 December 2021

When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked. If the Web Extension lacked the WebRequest permission for the hosts involved in the redirect, this would be a same-origin-violation leaking data the Web Extension should have access to. This was fixed to provide the pre-redirect URL. This is related to CVE-2021-43532 but in the context of Web Extensions. This vulnerability affects Firefox < 94.

Notes

AuthorNote
tyhicks
mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Medium

Cvss 3 Severity Score

4.3

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(94.0+build3-0ubuntu0.18.04.1)
focal Not vulnerable
(94.0+build3-0ubuntu0.20.04.1)
hirsute Not vulnerable
(94.0+build3-0ubuntu0.21.04.1)
impish Not vulnerable
(94.0+build3-0ubuntu0.21.10.1)
jammy Not vulnerable
(94.0+build3-0ubuntu1)
kinetic Not vulnerable
(94.0+build3-0ubuntu1)
lunar Not vulnerable
(94.0+build3-0ubuntu1)
trusty Does not exist

upstream
Released (94)
xenial Ignored
(end of standard support, was needed)

Severity score breakdown

Parameter Value
Base score 4.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N