Arch Linux Security Advisory ASA-202004-6 ========================================= Severity: Critical Date : 2020-04-04 CVE-ID : CVE-2020-6819 CVE-2020-6820 Package : firefox Type : arbitrary code execution Remote : Yes Link : https://security.archlinux.org/AVG-1125 Summary ======= The package firefox before version 74.0.1-1 is vulnerable to arbitrary code execution. Resolution ========== Upgrade to 74.0.1-1. # pacman -Syu "firefox>=74.0.1-1" The problems have been fixed upstream in version 74.0.1. Workaround ========== None. Description =========== - CVE-2020-6819 (arbitrary code execution) A use-after-free vulnerability has been found in Firefox before 74.0.1 where under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. Mozilla is aware of targeted attacks in the wild abusing this flaw. - CVE-2020-6820 (arbitrary code execution) A use-after-free vulnerability has been found in Firefox before 74.0.1 where, under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. Mozilla is aware of targeted attacks in the wild abusing this flaw. Impact ====== A remote attacker can execute arbitrary code on the affected host. References ========== https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/ https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/#CVE-2020-6819 https://bugzilla.mozilla.org/show_bug.cgi?id=1620818 https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/#CVE-2020-6820 https://bugzilla.mozilla.org/show_bug.cgi?id=1626728 https://security.archlinux.org/CVE-2020-6819 https://security.archlinux.org/CVE-2020-6820