Ubuntu Security Notice 2458-3 - USN-2458-1 fixed vulnerabilities in Firefox. This update introduced a regression which could make websites that use CSP fail to load under some circumstances. This update fixes the problem. Christian Holler, Patrick McManus, Christoph Diehl, Gary Kwong, Jesse Ruderman, Byron Campen, Terrence Cole, and Nils Ohlmeier 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. Bobby Holley discovered that some DOM objects with certain properties can bypass XrayWrappers in some circumstances. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to bypass security restrictions. Michal Zalewski discovered a use of uninitialized memory when rendering malformed bitmap images on a canvas element. Various other issues were also addressed.
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