I mentioned the Shellshock vulnerability earlier this week, and since more and more users/organizations are proclaiming attacks on their systems. Shellshock is without a doubt one of the worst vulnerabilities in recent years, and it seems it’s gotten worse already. Apparently, a Botnet code named “Mayhem” is already causing havoc. Mayhem is delivered via a PHP script, and is contained within a malicious ELF (Executable and Linkable Format) binary file, like a common .EXE file. It should be noted that there are separate malicious┬ábinaries for both the 32-bit and 64-bit architectures. The best way to avoid the Shellshock vulnerability and “Mayhem” is to keep systems up to date, and avoid malicious web sites at all costs.

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