While the vulnerability was already being actively exploited, the publication of the complete source code now puts it in the hands of a much wider base of people. The exploit makes direct calls to kernel32.dll, a core part of the Windows operating system.Ī representative of Mozilla said officials are aware of the vulnerability and are working on a fix. The adjustments are an indication that the people who developed the attack tested it extensively to ensure it worked on multiple releases of Firefox. The versions span from 41 to 50, with version 45 ESR being the version used by the latest version of the Tor browser. Yabut went on to say the code is "100% effective for remote code execution on Windows systems." The exploit code, the researcher added, adjusts the memory location of the payload based on the version of Firefox being exploited.
Joshua Yabut, another researcher who also analyzed the code, told Ars it exploits a so-called use-after-free bug that requires JavaScript to be enabled on the vulnerable computer. It wasn't responding to queries at the time this post was being prepared. The latter IP address is assigned to French Web host OVH. Where that attack sent a unique identifier to a server located at the IP address of 65.222.202.54, the new one sends data to a server at 5.39.27.226.
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