fixes #419, an admin can't change webmaster password

include/ws_functions/pwg.users.php

@@ -426,6 +426,27 @@ function ws_users_setInfo($params, &$service)
 
     if (!empty($params['password']))
     {
+      if (!is_webmaster())
+      {
+        $password_protected_users = array($conf['guest_id']);
+
+        $query = '
+SELECT
+    user_id
+  FROM '.USER_INFOS_TABLE.'
+  WHERE status IN (\'webmaster\', \'admin\')
+;';
+        $admin_ids = query2array($query, null, 'user_id');
+
+        // we add all admin+webmaster users BUT the user herself
+        $password_protected_users = array_merge($password_protected_users, array_diff($admin_ids, array($user['id'])));
+
+        if (in_array($params['user_id'][0], $password_protected_users))
+        {
+          return new PwgError(403, 'Only webmasters can change password of other "webmaster/admin" users');
+        }
+      }
+
       $updates[ $conf['user_fields']['password'] ] = $conf['password_hash']($params['password']);
     }
   }