BUUCTF-Web-[极客大挑战 2019]EasySQL1

BUUCTF-Web-[极客大挑战 2019]EasySQL1

打开题目环境，界面如下：

是个登录界面，结合题目知道应该是sql注入方面的漏洞。

输入1和1，提示：

NO,Wrong username password！！！

输入1‘和1，提示：

You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '1'' at line 1

出此报错，试试万能密码，试了几个没试出来，只能借助Burp批量测试了。

抓包如下：

GET /check.php?username=admin&password=123456 HTTP/1.1
Host: fed3def8-2fc2-4b49-bc52-5a1efa2888bd.node3.buuoj.cn
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://fed3def8-2fc2-4b49-bc52-5a1efa2888bd.node3.buuoj.cn/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Connection: close

选择字典，设置payload

GET /check.php?username=§admin§&password=123456 HTTP/1.1
Host: fed3def8-2fc2-4b49-bc52-5a1efa2888bd.node3.buuoj.cn
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://fed3def8-2fc2-4b49-bc52-5a1efa2888bd.node3.buuoj.cn/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Connection: close

Attack开始跑，不一会结果就出来了。