Fix SQL Injection (Legacy & Modern) in Tide

SQL Injection remains the most critical vulnerability in the Tide ecosystem, allowing attackers to bypass authentication and dump entire databases. Whether you are maintaining legacy Tide modules or building modern microservices, the root cause is the same: the dangerous conflation of data and code. To secure Tide, you must eliminate string concatenation in your data layer.

The Vulnerable Pattern

// Legacy Tide Pattern: Direct String Concatenation
$userId = $_GET['id'];
// DANGER: Attacker can input '1 OR 1=1' to bypass logic
$query = "SELECT * FROM tide_users WHERE id = " . $userId;
$results = $database->rawQuery($query);

The Secure Implementation

The vulnerability exists because the database engine cannot distinguish between the developer's SQL commands and the user-provided data when they are concatenated into a single string. In the 'Modern' fix, we use Parameterized Queries. This sends the SQL template to the database first, then sends the data separately. The database engine treats the input strictly as a literal value, never as executable code. For legacy systems where a full refactor isn't immediate, strict type-casting (e.g., forcing input to an integer) provides a secondary layer of defense, but parameterized statements remain the industry standard for preventing injection.

// Modern Tide Pattern: Prepared Statements (PDO/DB Wrapper)
$userId = $_GET['id'];
// Use placeholders (?) or named parameters (:id)
$stmt = $database->prepare(“SELECT * FROM tide_users WHERE id = ?”);
$stmt->execute([$userId]);
$user = $stmt->fetch();
// Alternative: Strict Type Casting for Legacy Fixes
$userId = (int)$_GET[‘id’];
$query = “SELECT * FROM tide_users WHERE id = $userId”;
$results = $database->rawQuery($query);