Arch Linux Security Advisory ASA-202011-1 ========================================= Severity: Critical Date : 2020-11-02 CVE-ID : CVE-2020-15254 CVE-2020-15680 CVE-2020-15681 CVE-2020-15682 CVE-2020-15683 CVE-2020-15684 CVE-2020-15969 Package : firefox Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-1256 Summary ======= The package firefox before version 82.0-1 is vulnerable to multiple issues including arbitrary code execution, information disclosure and content spoofing. Resolution ========== Upgrade to 82.0-1. # pacman -Syu "firefox>=82.0-1" The problems have been fixed upstream in version 82.0. Workaround ========== None. Description =========== - CVE-2020-15254 (arbitrary code execution) An undefined behaviour leading to memory corruption issues has been found in the crossbeam rust crate <= 0.4.3. The "bounded" channel incorrectly assumes that "Vec::from_iter" has allocated enough capacity for the number of iterator elements. "Vec::from_iter" does not actually guarantee that and may allocate extra memory. The destructor of the "bounded" channel reconstructs "Vec" from the raw pointer based on the incorrect assumptions described above. This is unsound and causing deallocation with the incorrect capacity when the size allocated by "Vec::from_iter" differs from the number of iterator elements. - CVE-2020-15680 (information disclosure) An information disclosure issue has been found in Firefox before 82.0 where 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. - CVE-2020-15681 (arbitrary code execution) A memory corruption issue has been found in Firefox before 82.0 where, when multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten the entry of another thread in a shared stub table, resulting in a potentially exploitable crash. - CVE-2020-15682 (content spoofing) A spoofing issue has been found in Firefox before 82.0 where, when a link to an external protocol was clicked, a prompt was presented that allowed the user to choose what application to open it in. An attacker could induce that prompt to be associated with an origin they didn't control, resulting in a spoofing attack. This was fixed by changing external protocol prompts to be tab-modal while also ensuring they could not be incorrectly associated with a different origin. - CVE-2020-15683 (arbitrary code execution) Several memory safety bugs have been found in Firefox before 82.0 and Firefox ESR before 78.4. Some of these bugs showed evidence of memory corruption and Mozilla presumes that with enough effort some of these could have been exploited to run arbitrary code. - CVE-2020-15684 (arbitrary code execution) Several memory safety bugs have been found in Firefox before 82.0. Some of these bugs showed evidence of memory corruption and Mozilla presumes that with enough effort some of these could have been exploited to run arbitrary code. - CVE-2020-15969 (arbitrary code execution) A use after free security issue has been found in the WebRTC component of the chromium browser before 86.0.4240.75 and of Firefox before 82.0. Impact ====== A remote attacker might be able to access sensitive information or execute arbitrary code. References ========== https://www.mozilla.org/en-US/security/advisories/mfsa2020-45/ https://www.mozilla.org/en-US/security/advisories/mfsa2020-45/#CVE-2020-1525... https://bugzilla.mozilla.org/show_bug.cgi?id=1668514 https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-v5m7-53cv... https://www.mozilla.org/en-US/security/advisories/mfsa2020-45/#CVE-2020-1568... https://bugzilla.mozilla.org/show_bug.cgi?id=1658881 https://www.mozilla.org/en-US/security/advisories/mfsa2020-45/#CVE-2020-1568... https://bugzilla.mozilla.org/show_bug.cgi?id=1666568 https://www.mozilla.org/en-US/security/advisories/mfsa2020-45/#CVE-2020-1568... https://bugzilla.mozilla.org/show_bug.cgi?id=1636654 https://www.mozilla.org/en-US/security/advisories/mfsa2020-45/#CVE-2020-1568... https://bugzilla.mozilla.org/buglist.cgi?bug_id=1576843%2C1656987%2C1660954%... https://www.mozilla.org/en-US/security/advisories/mfsa2020-45/#CVE-2020-1568... https://bugzilla.mozilla.org/buglist.cgi?bug_id=1653764%2C1661402%2C1662259%... https://chromereleases.googleblog.com/2020/10/stable-channel-update-for-desk... https://crbug.com/1124659 https://security.archlinux.org/CVE-2020-15254 https://security.archlinux.org/CVE-2020-15680 https://security.archlinux.org/CVE-2020-15681 https://security.archlinux.org/CVE-2020-15682 https://security.archlinux.org/CVE-2020-15683 https://security.archlinux.org/CVE-2020-15684 https://security.archlinux.org/CVE-2020-15969