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Some (bad) examples(3)
From that URL a script is invoked:
$url = $ENV{HTTP_REFERER}; # temp. url
($url, $dummy) = split(/\?/, $url);
$url =~ s@http://site/@@;
$url =~ s/%20/ /g;
unlink "$htdocs/$url";
Try:
HTTP_REFERER eq "../../../somefile"