- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202011-07 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: Mozilla Firefox: Remote code execution Date: November 11, 2020 Bugs: #753773 ID: 202011-07 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======= A use-after-free in Mozilla Firefox might allow remote attacker(s) to execute arbitrary code. Background ========= Mozilla Firefox is a popular open-source web browser from the Mozilla project. Affected packages ================ ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 www-client/firefox < 82.0.3 >= 78.4.1:0/esr78 >= 82.0.3 2 www-client/firefox-bin < 78.4.1 >= 78.4.1:0/esr78 >= 82.0.3 ------------------------------------------------------------------- 2 affected packages Description ========== Invalid assumptions when emitting the the MCallGetProperty opcode in the JavaScript JIT may result in a use-after-free condition. Impact ===== A remote attacker could possibly execute arbitrary code with the privileges of the process, or cause a Denial of Service condition. Workaround ========= There is no known workaround at this time. Resolution ========= All Mozilla Firefox users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=www-client/firefox-82.0.3" All Mozilla Firefox (bin) users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot -v ">=www-client/firefox-bin-78.4.1:0/esr78" All Mozilla Firefox (ESR) users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=www-client/firefox-82.0.3" All Mozilla Firefox (ESR) bin users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot -v ">=www-client/firefox-bin-78.4.1:0/esr78" References ========= [ 1 ] CVE-2020-26950 https://nvd.nist.gov/vuln/detail/CVE-2020-26950 [ 2 ] MFSA-2020-49 https://www.mozilla.org/en-US/security/advisories/mfsa2020-49/ Availability =========== This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202011-07 Concerns? ======== Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ====== Copyright 2020 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. https://creativecommons.org/licenses/by-sa/2.5