1540 vulnerabilities classified as CWE-918 (服务端请求伪造(SSRF)). AI Chinese analysis included.
CWE-918, Server-Side Request Forgery, is a critical web security weakness where an application allows users to specify URLs that the server subsequently fetches without adequate validation. Attackers typically exploit this by manipulating input parameters to force the server to access internal resources, such as cloud metadata services or local network endpoints, which are otherwise inaccessible from the outside. This bypasses perimeter defenses, potentially leading to sensitive data exposure or internal network reconnaissance. To mitigate SSRF, developers must implement strict input validation, ensuring that only whitelisted domains and protocols are permitted. Additionally, employing network-level controls like firewalls to restrict outbound connections from the application server and isolating internal services from public-facing interfaces significantly reduces the attack surface, preventing unauthorized internal access.
$url = $_GET['url']; # User-controlled input # Fetch the content of the provided URL $response = file_get_contents($url); echo $response;# Define allowed URLs (or domains) $allowed_urls = [ 'https://example.com/data.json', 'https://api.example.com/info', ]; # Get the user-provided URL $url = $_GET['url'] ?? ''; # Validate against allowed URLs if (!in_array($url, $allowed_urls)) { http_response_code(400); echo "Invalid or unauthorized URL."; exit; } # Fetch content safely $response = @file_get_contents($url); if ($response === false) { http_response_code(500); echo "Failed to fetch content."; exit; } echo htmlspecialchars($response); # Escape output for safetyVulnerabilities classified as CWE-918 (服务端请求伪造(SSRF)) represent 1540 CVEs. The CWE taxonomy describes the weakness; review individual CVEs for product-specific impact.