Firefox versions prior to 33 leak bits of uninitialized memory when rendering certain types of truncated images onto canvas tags. Secondly, MSRC case #19611cz is a seemingly similar issue with Internet Explorer apparently using bits of uninitialized stack data when handling JPEG files with an oddball DHT.
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Ubuntu Security Notice 2372-1 - Bobby Holley, Christian Holler, David Bolter, Byron Campen, Jon Coppeard, Carsten Book, Martijn Wargers, Shih-Chiang Chien, Terrence Cole and Jeff Walden 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. Atte Kettunen discovered a buffer overflow during CSS manipulation. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this 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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