Arch Linux Security Advisory ASA-201508-12 ========================================== Severity: Critical Date : 2015-08-28 CVE-ID : CVE-2015-4497 CVE-2015-4498 Package : firefox Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package firefox before version 40.0.3-1 is vulnerable to arbitrary code execution and add-on dialog bypass/spoof. Resolution ========== Upgrade to 40.0.3-1. # pacman -Syu "firefox>=40.0.3-1" The problem has been fixed upstream in version 40.0.3. Workaround ========== None. Description =========== - CVE-2015-4497 (use-after-free when resizing canvas element during restyling): Mozilla community member Jean-Max Reymond discovered a use-after-free vulnerability with a <canvas> element on a page. This occurs when a resize event is triggered in concert with style changes but the canvas references have been recreated in the meantime, destroying the originally referenced context. This results in an exploitable crash. Ucha Gobejishvili, working with HP's Zero Day Initiative, subsequently reported this same issue. - CVE-2015-4498 (add-on bypass dialog and spoof): Security researcher Bas Venis reported a mechanism where add-ons could be installed from a different source than user expectations. Normally, when a user enters the URL to an add-on directly in the addressbar, warning prompts are bypassed because it is the result of direct user action. He discovered that a data: URL could be manipulated on a loaded page to simulate this direct user input of the add-on's URL, which would result in a bypassing of the install permission prompt. He also reported that in the absence of the permission prompt, it is possible to cause the actual installation prompt to appear above another site's location by causing a page navigation immediately after triggering add-on installation. This could manipulate a user into falsely believing a trusted site (such as addons.mozilla.org) has initiated the installation. This could lead to users installing an add-on from a malicious source. Impact ====== A remote attacker can execute arbitrary code on the affected host if the user can be led to visit a crafted website. A remote attacker can also trick a user into installing an add-on from a malicious source. References ========== https://www.mozilla.org/en-US/security/advisories/mfsa2015-94/ https://www.mozilla.org/en-US/security/advisories/mfsa2015-95/ https://access.redhat.com/security/cve/CVE-2015-4497 https://access.redhat.com/security/cve/CVE-2015-4498