Gentoo Linux Security Advisory 201504-1 - Multiple vulnerabilities have been found in Mozilla Firefox, Thunderbird, and SeaMonkey, the worst of which may allow user-assisted execution of arbitrary code. Versions less than 31.5.3 are affected.
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Ubuntu Security Notice 2052-1 - Ben Turner, Bobby Holley, Jesse Ruderman, Christian Holler and Christoph Diehl discovered multiple memory safety issues in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service via application crash, or execute arbitrary code with the privileges of the user invoking Firefox. Myk Melez discovered that the doorhanger notification for web app installation could persist between page navigations. An attacker could potentially exploit this to conduct clickjacking attacks. Various other issues were also addressed.
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