If a malicious site repeatedly triggers a modal authentication prompt, eventually the browser UI will become non-responsive, requiring shutdown through the operating system. This is a denial of service (DOS) attack. This vulnerability affects Firefox < 52 and Thunderbird < 52.
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{ "availability": "No subscription required", "binaries": [ { "binary_name": "firefox", "binary_version": "52.0+build2-0ubuntu0.16.04.1" }, { "binary_name": "firefox-dev", "binary_version": "52.0+build2-0ubuntu0.16.04.1" }, { "binary_name": "firefox-globalmenu", "binary_version": "52.0+build2-0ubuntu0.16.04.1" }, { "binary_name": "firefox-mozsymbols", "binary_version": "52.0+build2-0ubuntu0.16.04.1" }, { "binary_name": "firefox-testsuite", "binary_version": "52.0+build2-0ubuntu0.16.04.1" } ] }