Debian Linux Security Advisory 4295-1 - safety errors and use-after-frees may lead to the execution of arbitrary code or denial of service.
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Ubuntu Security Notice 3705-1 - Multiple security issues were discovered 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, read uninitialized memory, bypass same-origin restrictions, bypass CORS restrictions, bypass CSRF protections, obtain sensitive information, or execute arbitrary code. Various other issues were also addressed.
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