## Summary The `Mysqls.add` API command (`lib/Froxlor/Api/Commands/Mysqls.php`) accepts a customer-controlled `mysql_server` parameter and only validates that the value is numeric and that the server index exists in `userdata.inc.php`. It never checks the value against the calling customer's `allowed_mysqlserver` allowlist. A customer can therefore create a database, plus a MySQL user with a password they choose, on any MySQL server the operator has configured — including servers that were explicitly excluded from that customer (e.g. a separate cluster, premium-tier host, or another tenant pool). The same `allowed_mysqlserver` check is correctly enforced in `MysqlServer::get()` / `MysqlServer::listing()` and in the customer-facing UI (`customer_mysql.php`), confirming the omission is a bug, not by-design. ## Details **Vulnerable code path** — `lib/Froxlor/Api/Commands/Mysqls.php:69-99` (`add()`): ```php public function add() { if (($this->getUserDetail('mysqls_used') < $this->getUserDetail('mysqls') || ...) { ... $customer = $this->getCustomerData('mysqls'); // line 80 $dbserver = $this->getParam('mysql_server', true, // line 81 — user-controlled $this->getDefaultMySqlServer($customer)); ... $dbserver = Validate::validate($dbserver, ..., '/^[0-9]+$/', ...); // line 92 — numeric only Database::needRoot(true, $dbserver, false); // line 93 — root ctx for ANY index Database::needSqlData(); $sql_root = Database::getSqlData(); Database::needRoot(false); if (!is_array($sql_root)) { // line 97 — only existence check throw new Exception("Database server with index #" . $dbserver . " is unknown", 404); } ... $username = $dbm->createDatabase($newdb_params['loginname'], $password, $dbserver, ...); // line 116/118 — DB+user created ... Database::pexecute($stmt, ["customerid"=>$customer['customerid'], ..., "dbserver"=>$dbserver], ...); } } ``` The `$customer['allowed_mysqlserver']` field IS read on line 80 but is only consumed by `getDefaultMySqlServer()` (lines 566-573) to compute a default when the request omits `mysql_server`. As soon as the client supplies the parameter, the default path is skipped and no further authorization gate runs. **Cross-file evidence the check is intended elsewhere:** - `lib/Froxlor/Api/Commands/MysqlServer.php:319-323` — `get()` rejects with HTTP 405 when `$dbserver` is not in `allowed_mysqlserver`: ```php if ($this->isAdmin() == false) { $allowed_mysqls = json_decode($this->getUserDetail('allowed_mysqlserver'), true); if ($allowed_mysqls === false || empty($allowed_mysqls) || !in_array($dbserver, $allowed_mysqls)) { throw new Exception("You cannot access this resource", 405); } ... } ``` - `lib/Froxlor/Api/Commands/MysqlServer.php:252-257` — same allowlist filter on `listing()`. - `customer_mysql.php:222` — UI rejects with `Response::dynamicError('No permission')` when `empty($allowed_mysqlservers)`. **Chain of execution (attacker → impact):** 1. Customer authenticates to `api.php` with apikey/secret. The only API gate is `cust_api_allowed`; `allowed_mysqlserver` is not consulted at auth time. 2. Customer sends JSON `{"command":"Mysqls.add","params":{"mysql_password":"<valid>","mysql_server":<disallowed_idx>}}`. 3. `Mysqls.php:71` quota check passes (`mysqls_used < mysqls`). 4. `Mysqls.php:80` `getCustomerData('mysqls')` returns the caller's own row. 5. `Mysqls.php:81` `$dbserver` is set from the request (default-fallback path skipped). 6. `Mysqls.php:92` numeric regex passes. 7. `Mysqls.php:93-99` `Database::needRoot(true, $dbserver, false)` switches to the root context of the attacker-chosen server; existence check passes. 8. `Mysqls.php:116/118` `DbManager::createDatabase(...)` runs against the disallowed server using stored root credentials, creating the DB and granting the supplied password to `<loginname>_<sqlN>` (DbManager.php:177-218). 9. `Mysqls.php:127-141` inserts a row into `TABLE_PANEL_DATABASES` with the attacker's `customerid` and the disallowed `dbserver`, allowing later management via `Mysqls.get/update/delete` (which only filter by `customerid` for non-admins, e.g. `Mysqls.php:282`). ## PoC Preconditions on the target instance: - ≥2 MySQL servers configured in `lib/userdata.inc.php` (e.g. index 0 default, index 1 internal/premium). - Customer X with `allowed_mysqlserver=[0]`, `cust_api_allowed=1`, `mysqls > 0`, and an issued API key (`apikey:secret`). Request — customer creates a database on server `1`, which is *not* in their allowlist: ```bash curl -k -u 'CUST_APIKEY:CUST_SECRET' \ -H 'Content-Type: application/json' \ -X POST \ -d '{"command":"Mysqls.add","params":{"mysql_password":"ValidP@ssw0

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