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Re: Unexpected "text/plain" output with cgi

by enoch (Chaplain)
on Nov 13, 2002 at 17:48 UTC ( #212645=note: print w/ replies, xml ) Need Help??


in reply to Unexpected "text/plain" output with cgi

Since no one has pointed it out, yet, you really really, really do not want to do:

if ($page) { &$page; }
What if someone (and, don't do this) passed in the URL http://www.robotskull.com/cgi-bin/index.cgi?page=kittens;`rm -rf /etc` (or worse). A better way would be to:
if($page) { SWITCH: { &kitten, last SWITCH if($page eq 'kitten'); &foo, last SWITCH if($page eq 'foo'); &bar, last SWITCH if($page eq 'bar'); . . . print STDERR "invalid CGI parameter", last SWITCH; } }

Enoch


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