Firefox ESR and 1 other: If a valid external protocol handler was referenced in an image tag, the resulting broken image size…
CVE-2020-15680 is fixed in 4 products on 2 platforms, first by firefox 82.0+build2-0ubuntu0.18.04.1, released October 21, 2020. It is not reported as exploited. Patch Radar priority: Routine.
If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. This vulnerability affects Firefox < 82.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 91.0 | Mozilla Firefox ESR (en-US) 91.0 | Aug 4, 2021 |
| Linux | |||
| firefox · Ubuntu 18.04.6 LTS (bionic) | 82.0+build2-0ubuntu0.18.04.1 | firefox 82.0+build2-0ubuntu0.18.04.1 | Oct 21, 2020 |
| firefox · Ubuntu 20.04 LTS (focal) | 82.0+build2-0ubuntu0.20.04.1 | firefox 82.0+build2-0ubuntu0.20.04.1 | Oct 21, 2020 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 82.0+build2-0ubuntu0.18.04.1 | firefox-geckodriver 82.0+build2-0ubuntu0.18.04.1 | Oct 21, 2020 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 82.0+build2-0ubuntu0.20.04.1 | firefox-geckodriver 82.0+build2-0ubuntu0.20.04.1 | Oct 21, 2020 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 82.0+build2-0ubuntu0.18.04.1 | firefox-mozsymbols 82.0+build2-0ubuntu0.18.04.1 | Oct 21, 2020 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 82.0+build2-0ubuntu0.20.04.1 | firefox-mozsymbols 82.0+build2-0ubuntu0.20.04.1 | Oct 21, 2020 |
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