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.
{ "availability": "No subscription required", "binaries": [ { "binary_name": "firefox", "binary_version": "80.0+build2-0ubuntu0.16.04.1" }, { "binary_name": "firefox-dev", "binary_version": "80.0+build2-0ubuntu0.16.04.1" }, { "binary_name": "firefox-geckodriver", "binary_version": "80.0+build2-0ubuntu0.16.04.1" }, { "binary_name": "firefox-mozsymbols", "binary_version": "80.0+build2-0ubuntu0.16.04.1" } ] }
{ "availability": "No subscription required", "binaries": [ { "binary_name": "firefox", "binary_version": "80.0+build2-0ubuntu0.18.04.1" }, { "binary_name": "firefox-dev", "binary_version": "80.0+build2-0ubuntu0.18.04.1" }, { "binary_name": "firefox-geckodriver", "binary_version": "80.0+build2-0ubuntu0.18.04.1" }, { "binary_name": "firefox-mozsymbols", "binary_version": "80.0+build2-0ubuntu0.18.04.1" } ] }
{ "availability": "No subscription required", "binaries": [ { "binary_name": "firefox", "binary_version": "80.0+build2-0ubuntu0.20.04.1" }, { "binary_name": "firefox-dev", "binary_version": "80.0+build2-0ubuntu0.20.04.1" }, { "binary_name": "firefox-geckodriver", "binary_version": "80.0+build2-0ubuntu0.20.04.1" }, { "binary_name": "firefox-mozsymbols", "binary_version": "80.0+build2-0ubuntu0.20.04.1" } ] }