Ubuntu Security Notice 6710-2 - USN-6710-1 fixed vulnerabilities in Firefox. The update introduced several minor regressions. This update fixes the problem. Manfred Paul discovered that Firefox did not properly perform bounds checking during range analysis, leading to an out-of-bounds write vulnerability. A attacker could use this to cause a denial of service, or execute arbitrary code. Manfred Paul discovered that Firefox incorrectly handled MessageManager listeners under certain circumstances. An attacker who was able to inject an event handler into a privileged object may have been able to execute arbitrary code.
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