Gentoo Linux Security Advisory 201701-15 - Multiple vulnerabilities have been found in Mozilla Firefox, SeaMonkey, and Thunderbird the worst of which could lead to the execution of arbitrary code. Versions less than 45.6.0 are affected.
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Ubuntu Security Notice 2936-1 - Christian Holler, Tyson Smith, Phil Ringalda, Gary Kwong, Jesse Ruderman, Mats Palmgren, Carsten Book, Boris Zbarsky, David Bolter, Randell Jesup, Andrew McCreight, and Steve Fink 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. Various other issues were also addressed.
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