Fix SQL Injection Vulnerabilities (#134)

* avoid sql injections

* linter

* fix test using random sid

* add some test cases

* remove tests that don't use the new validation

* add test

* linter

* fix tests

* add test

---------

Co-authored-by: Guilherme Rauen <g.rauen@cognigy.com>

lib/models/model.js

@@ -107,7 +107,7 @@ class Model extends Emitter {
       if (pk.name in obj) throw new DbErrorBadRequest(`primary key ${pk.name} is immutable`);
       getMysqlConnection((err, conn) => {
         if (err) return reject(err);
-        conn.query(`UPDATE ${this.table} SET ? WHERE ${pk.name} = '${sid}'`, obj, (err, results, fields) => {
+        conn.query(`UPDATE ${this.table} SET ? WHERE ${pk.name} = ?`, [obj, sid], (err, results, fields) => {
           conn.release();
           if (err) return reject(err);
           resolve(results.affectedRows);