UPDATE `b_user` SET password = MD5('passwd') where login = "admin";
<?php
require_once($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");
$USER->Authorize(1);
require_once($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/epilog_after.php");
?>
$salt = randString(8);
$arFields["PASSWORD"] = $salt.md5($salt.$arFields["PASSWORD"]);