Mozilla Firefox ESR and 1 other: WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party…
CVE-2021-43540 is fixed in 4 products on 2 platforms, first by firefox 95.0+build1-0ubuntu0.18.04.1, released December 7, 2021. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 102.0 | Mozilla Firefox ESR (en-US) 102.0 | Jun 23, 2022 |
| Linux | |||
| firefox · Ubuntu 18.04.6 LTS (bionic) | 95.0+build1-0ubuntu0.18.04.1 | firefox 95.0+build1-0ubuntu0.18.04.1 | Dec 7, 2021 |
| firefox · Ubuntu 20.04 LTS (focal) | 95.0+build1-0ubuntu0.20.04.1 | firefox 95.0+build1-0ubuntu0.20.04.1 | Dec 7, 2021 |
| firefox · Ubuntu 22.04.1 LTS (jammy) | 95.0+build1-0ubuntu1 | firefox 95.0+build1-0ubuntu1 | Dec 7, 2021 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 95.0+build1-0ubuntu0.18.04.1 | firefox-geckodriver 95.0+build1-0ubuntu0.18.04.1 | Dec 7, 2021 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 95.0+build1-0ubuntu0.20.04.1 | firefox-geckodriver 95.0+build1-0ubuntu0.20.04.1 | Dec 7, 2021 |
| firefox-geckodriver · Ubuntu 22.04.1 LTS (jammy) | 95.0+build1-0ubuntu1 | firefox-geckodriver 95.0+build1-0ubuntu1 | Dec 7, 2021 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 95.0+build1-0ubuntu0.18.04.1 | firefox-mozsymbols 95.0+build1-0ubuntu0.18.04.1 | Dec 7, 2021 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 95.0+build1-0ubuntu0.20.04.1 | firefox-mozsymbols 95.0+build1-0ubuntu0.20.04.1 | Dec 7, 2021 |
| firefox-mozsymbols · Ubuntu 22.04.1 LTS (jammy) | 95.0+build1-0ubuntu1 | firefox-mozsymbols 95.0+build1-0ubuntu1 | Dec 7, 2021 |
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