They got that information from a Connectiva security advisory. That advisory actually says "trigger the execution of arbitrary commands" but if you read the context you'll find that in fact what it means is that a cunning attacker could use a minor flaw in Apache that allows it to log escape characters in order to exploit possible flaws in terminal emulators to execure arbitrary commands if you view the log file. [source].
So we've magically turned an issue which is of quite minor risk and minor severity into one classed as "Moderately Critical". Using the same logic you could then use publicised (but fixed) flaws in the Linux kernel to gain root privileges and we've got a remote root exploit in Apache folks! It's Chinese Whisper Security Advisories at their best.
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