Avoid shell execution when processing multi.pl rules - #47
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Rules-file fields were interpolated into a one-string system call, allowing shell metacharacters to run as the invoking user. Replace the shell pipeline with an explicit zcat child and list-form ngrep invocation. Validate rule names before using them in output paths.
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Rules-file fields flow from scripts/multi.pl:98-111 into the
one-string system call at lines 75-77, allowing shell metacharacters
to execute as the invoking user.
Replace the shell pipeline with an explicit zcat child and list-form
ngrep invocation. Rule names are restricted before they are used for
the output filename.