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system "echo $arg"; # Insecure system "/bin/echo", $arg; # Secure (doesn't use sh) ... $path = $ENV{'PATH'}; # $path now NOT tainted system "echo $data"; # Is secure now!
system "/usr/sbin/useradd $cli";
## taint environmentals $ENV{'PATH'} = "/bin:/usr/sbin"; ... print "CLI is $cli"; system("/usr/sbin/useradd $cli");
-s "/bin/false" -d "/home/clients/stage.domain.com/testcjm" -G "hostin +g,domain" testcjm
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