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
| Author | Note |
|---|---|
| tyhicks |
mozjs contains a copy of the SpiderMonkey JavaScript engine |
Priority
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 |