Firefox ESR and 1 other: When trying to load a non-video in an audio/video context the exact status code (200, 302, 404, 500,…
CVE-2020-15666 is fixed in 4 products on 2 platforms, first by firefox 80.0+build2-0ubuntu0.18.04.1, released August 25, 2020. It is not reported as exploited. Patch Radar priority: Routine.
When trying to load a non-video in an audio/video context the exact status code (200, 302, 404, 500, 412, 403, etc.) was disclosed via the MediaError Message. This level of information leakage is inconsistent with the standardized onerror/onsuccess disclosure and can lead to inferring login status to services or device discovery on a local network among other attacks. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
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) | 80.0+build2-0ubuntu0.18.04.1 | firefox 80.0+build2-0ubuntu0.18.04.1 | Aug 25, 2020 |
| firefox · Ubuntu 20.04 LTS (focal) | 80.0+build2-0ubuntu0.20.04.1 | firefox 80.0+build2-0ubuntu0.20.04.1 | Aug 25, 2020 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 80.0+build2-0ubuntu0.18.04.1 | firefox-geckodriver 80.0+build2-0ubuntu0.18.04.1 | Aug 25, 2020 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 80.0+build2-0ubuntu0.20.04.1 | firefox-geckodriver 80.0+build2-0ubuntu0.20.04.1 | Aug 25, 2020 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 80.0+build2-0ubuntu0.18.04.1 | firefox-mozsymbols 80.0+build2-0ubuntu0.18.04.1 | Aug 25, 2020 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 80.0+build2-0ubuntu0.20.04.1 | firefox-mozsymbols 80.0+build2-0ubuntu0.20.04.1 | Aug 25, 2020 |
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