VUPEN Vulnerability Research Team discovered a critical vulnerability in Mozilla Firefox. The vulnerability is caused by a use-after-free error in the JS engine when processing "BumpChunk" objects while the browser is under a memory pressure, which could be exploited to leak arbitrary memory and/or achieve code execution via a malicious web page. Affected include Mozilla Firefox versions prior to 28, Mozilla Firefox ESR versions prior to 24.4, Mozilla Thunderbird versions prior to 24.4, and Mozilla Seamonkey versions prior to 2.25.
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