By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Firefox | Mozilla | * | 63.0 (excluding) |
| Firefox_esr | Mozilla | * | 60.3 (excluding) |
| Red Hat Enterprise Linux 6 | RedHat | firefox-0:60.3.0-1.el6 | * |
| Red Hat Enterprise Linux 7 | RedHat | firefox-0:60.3.0-1.el7_5 | * |
| Firefox | Ubuntu | bionic | * |
| Firefox | Ubuntu | cosmic | * |
| Firefox | Ubuntu | devel | * |
| Firefox | Ubuntu | disco | * |
| Firefox | Ubuntu | eoan | * |
| Firefox | Ubuntu | focal | * |
| Firefox | Ubuntu | groovy | * |
| Firefox | Ubuntu | hirsute | * |
| Firefox | Ubuntu | impish | * |
| Firefox | Ubuntu | jammy | * |
| Firefox | Ubuntu | kinetic | * |
| Firefox | Ubuntu | lunar | * |
| Firefox | Ubuntu | mantic | * |
| Firefox | Ubuntu | noble | * |
| Firefox | Ubuntu | trusty | * |
| Firefox | Ubuntu | upstream | * |
| Firefox | Ubuntu | xenial | * |
| Mozjs38 | Ubuntu | bionic | * |
| Mozjs38 | Ubuntu | esm-apps/bionic | * |
| Mozjs38 | Ubuntu | upstream | * |
| Mozjs52 | Ubuntu | bionic | * |
| Mozjs52 | Ubuntu | cosmic | * |
| Mozjs52 | Ubuntu | disco | * |
| Mozjs52 | Ubuntu | eoan | * |
| Mozjs52 | Ubuntu | esm-apps/focal | * |
| Mozjs52 | Ubuntu | esm-infra/bionic | * |
| Mozjs52 | Ubuntu | focal | * |
| Mozjs52 | Ubuntu | groovy | * |
| Mozjs52 | Ubuntu | upstream | * |
| Mozjs60 | Ubuntu | cosmic | * |
| Mozjs60 | Ubuntu | disco | * |
| Mozjs60 | Ubuntu | eoan | * |
| Mozjs60 | Ubuntu | upstream | * |