Overview
CVE-2018-6330 identifies an error-based SQL injection vulnerability in Laravel 5.4.15, where unsafely constructed SQL in save.php could be triggered by dhx_user and dhx_version inputs. This kind of flaw allows an attacker to influence the structure of a query and provoke database errors or leak data, especially when error messages are exposed to the user. The impact in real deployments ranges from information disclosure to potential data tampering if the attacker can manipulate the affected query path. The CWE-89 classification (SQL Injection) applies here because unsanitized user inputs were embedded directly into SQL sent to the database, enabling injection by crafting the dhx_user and dhx_version parameters. Reference to CVE-2018-6330 anchors this discussion to the specific Laravel 5.4.15 scenario and its associated risk surface.
Affected Versions
Laravel 5.4.15
Code Fix Example
Laravel API Security Remediation
<?php
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
class SaveController extends Controller {
// Vulnerable pattern (for reference only in this guide)
public function saveVulnerable(Request $request) {
$dhx_user = $request->input('dhx_user');
$dhx_version = $request->input('dhx_version');
// Vulnerable: direct interpolation of user input into SQL
DB::statement("INSERT INTO saves (dhx_user, dhx_version, created_at) VALUES ('".$dhx_user."', '".$dhx_version."', NOW())");
}
// Fixed pattern (bind parameters to prevent injection)
public function saveFixed(Request $request) {
$dhx_user = $request->input('dhx_user');
$dhx_version = $request->input('dhx_version');
// Safe: parameter binding prevents SQL injection
DB::insert("INSERT INTO saves (dhx_user, dhx_version, created_at) VALUES (?, ?, NOW())", [$dhx_user, $dhx_version]);
// Alternative using the query builder
// DB::table('saves')->insert(['dhx_user' => $dhx_user, 'dhx_version' => $dhx_version, 'created_at' => now()]);
}
}
?>