Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables. This could have been used to probe the browser history. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.
{ "binaries": [ { "binary_name": "firefox", "binary_version": "100.0+build2-0ubuntu0.18.04.1" }, { "binary_name": "firefox-dev", "binary_version": "100.0+build2-0ubuntu0.18.04.1" }, { "binary_name": "firefox-geckodriver", "binary_version": "100.0+build2-0ubuntu0.18.04.1" }, { "binary_name": "firefox-mozsymbols", "binary_version": "100.0+build2-0ubuntu0.18.04.1" } ], "availability": "No subscription required" }
{ "binaries": [ { "binary_name": "thunderbird", "binary_version": "1:91.9.1+build1-0ubuntu0.18.04.1" }, { "binary_name": "thunderbird-dev", "binary_version": "1:91.9.1+build1-0ubuntu0.18.04.1" }, { "binary_name": "thunderbird-gnome-support", "binary_version": "1:91.9.1+build1-0ubuntu0.18.04.1" }, { "binary_name": "thunderbird-mozsymbols", "binary_version": "1:91.9.1+build1-0ubuntu0.18.04.1" }, { "binary_name": "xul-ext-calendar-timezones", "binary_version": "1:91.9.1+build1-0ubuntu0.18.04.1" }, { "binary_name": "xul-ext-gdata-provider", "binary_version": "1:91.9.1+build1-0ubuntu0.18.04.1" }, { "binary_name": "xul-ext-lightning", "binary_version": "1:91.9.1+build1-0ubuntu0.18.04.1" } ], "availability": "No subscription required" }
{ "binaries": [ { "binary_name": "firefox", "binary_version": "100.0+build2-0ubuntu0.20.04.1" }, { "binary_name": "firefox-dev", "binary_version": "100.0+build2-0ubuntu0.20.04.1" }, { "binary_name": "firefox-geckodriver", "binary_version": "100.0+build2-0ubuntu0.20.04.1" }, { "binary_name": "firefox-mozsymbols", "binary_version": "100.0+build2-0ubuntu0.20.04.1" } ], "availability": "No subscription required" }
{ "binaries": [ { "binary_name": "thunderbird", "binary_version": "1:91.9.1+build1-0ubuntu0.20.04.1" }, { "binary_name": "thunderbird-dev", "binary_version": "1:91.9.1+build1-0ubuntu0.20.04.1" }, { "binary_name": "thunderbird-gnome-support", "binary_version": "1:91.9.1+build1-0ubuntu0.20.04.1" }, { "binary_name": "thunderbird-mozsymbols", "binary_version": "1:91.9.1+build1-0ubuntu0.20.04.1" }, { "binary_name": "xul-ext-calendar-timezones", "binary_version": "1:91.9.1+build1-0ubuntu0.20.04.1" }, { "binary_name": "xul-ext-gdata-provider", "binary_version": "1:91.9.1+build1-0ubuntu0.20.04.1" }, { "binary_name": "xul-ext-lightning", "binary_version": "1:91.9.1+build1-0ubuntu0.20.04.1" } ], "availability": "No subscription required" }
{ "binaries": [ { "binary_name": "thunderbird", "binary_version": "1:91.9.1+build1-0ubuntu0.22.04.1" }, { "binary_name": "thunderbird-dev", "binary_version": "1:91.9.1+build1-0ubuntu0.22.04.1" }, { "binary_name": "thunderbird-gnome-support", "binary_version": "1:91.9.1+build1-0ubuntu0.22.04.1" }, { "binary_name": "thunderbird-mozsymbols", "binary_version": "1:91.9.1+build1-0ubuntu0.22.04.1" }, { "binary_name": "xul-ext-calendar-timezones", "binary_version": "1:91.9.1+build1-0ubuntu0.22.04.1" }, { "binary_name": "xul-ext-gdata-provider", "binary_version": "1:91.9.1+build1-0ubuntu0.22.04.1" }, { "binary_name": "xul-ext-lightning", "binary_version": "1:91.9.1+build1-0ubuntu0.22.04.1" } ], "availability": "No subscription required" }