CVE-2021-43540
Published: 8 December 2021
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
Notes
| Author | Note |
|---|---|
| tyhicks | mozjs contains a copy of the SpiderMonkey JavaScript engine |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
firefox Launchpad, Ubuntu, Debian |
bionic |
Released
(95.0+build1-0ubuntu0.18.04.1)
|
| focal |
Released
(95.0+build1-0ubuntu0.20.04.1)
|
|
| hirsute |
Released
(95.0+build1-0ubuntu0.21.04.1)
|
|
| impish |
Released
(95.0+build1-0ubuntu0.21.10.1)
|
|
| jammy |
Released
(95.0+build1-0ubuntu1)
|
|
| kinetic |
Released
(95.0+build1-0ubuntu1)
|
|
| lunar |
Released
(95.0+build1-0ubuntu1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(95)
|
|
| xenial |
Ignored
(end of standard support, was needed)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | High |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |