Command Injection in Laravel with Cockroachdb

Command injection occurs when untrusted input is concatenated into a system command executed by the application. In Laravel applications that interact with CockroachDB, developers sometimes use operating system utilities to manage database tasks, such as backups, migrations, or cluster operations. If user-controlled data is passed into these commands without proper sanitization, the application can execute arbitrary shell commands.

For example, consider a Laravel controller that accepts a database name from an HTTP request and passes it to a CockroachDB command using exec or shell_exec. If the input is not validated or escaped, an attacker can inject additional shell commands using shell metacharacters such as ;, &&, or backticks. This can lead to unauthorized command execution, data exfiltration, or further compromise of the host environment.

Laravel's database layer does not directly expose CockroachDB to command injection; the risk arises when developers mix database interactions with shell execution. The use of raw queries or query builders protects against SQL injection, but does not protect against command injection. Security checks in the BFLA/Privilege Escalation and Unsafe Consumption categories are designed to detect such risky patterns during scanning.

During a scan, middleBrick tests for unauthenticated endpoints that accept input and inspects whether shell commands are constructed dynamically. If the scan detects command construction patterns involving CockroachDB CLI calls, it flags the issue under BFLA/Privilege Escalation and Unsafe Consumption checks, providing prioritized findings with severity levels and remediation guidance.

To prevent command injection when working with CockroachDB in Laravel, avoid passing user input directly to shell commands. Instead, use Laravel's built-in database query builder and Eloquent ORM, which safely parameterize queries and do not invoke the shell.

When administrative operations require executing CockroachDB commands, validate and strictly limit the input. Use an allowlist for database names or table names, and avoid using user input in command arguments. If shell execution is unavoidable, use escapeshellarg to safely escape arguments.

Safe Laravel Database Interaction with CockroachDB

Use Laravel's database configuration to connect to CockroachDB, and rely on query builders for all data operations. This approach eliminates the need for shell commands entirely.

// config/database.php
return [
    'connections' => [
        'cockroach' => [
            'driver' => 'pgsql',
            'host' => env('DB_HOST', 'localhost'),
            'port' => env('DB_PORT', 26257),
            'database' => env('DB_DATABASE', 'default_db'),
            'username' => env('DB_USERNAME', 'root'),
            'password' => env('DB_PASSWORD', ''),
            'charset' => 'utf8',
            'prefix' => '',
            'schema' => 'public',
        ],
    ],
];

// Use the connection in a model or query builder
use Illuminate\Support\Facades\DB;

$users = DB::connection('cockroach')->table('users')->where('id', 1)->get();

Safe Shell Execution When Necessary

If you must execute a CockroachDB CLI command, validate input strictly and use escapeshellarg to prevent injection.

$databaseName = request()->input('database');

// Validate against an allowlist
$allowedDatabases = ['app_db', 'analytics_db', 'audit_db'];
if (! in_array($databaseName, $allowedDatabases)) {
    return response()->json(['error' => 'Invalid database name'], 400);
}

// Escape the argument safely
$command = sprintf(
    'cockroach sql --database=%s --execute=%s',
    escapeshellarg($databaseName),
    escapeshellarg('SELECT 1')
);
shell_exec($command);

Avoid Unsafe Patterns

Never concatenate user input directly into shell commands, even when using helper functions.

$input = request()->input('table');
// Unsafe example — DO NOT use
// shell_exec("cockroach sql --execute=DROP TABLE $input");

// Safer alternative using query builder
DB::connection('cockroach')->statement("DROP TABLE IF EXISTS \"{$input}\"");