Databases have been the heart of a commercial website. An attack on the database servers can cause a great monetary loss for the company. Database servers are usually hacked to get the credit card information. And just one hack on a commercial site will bring down its reputation and also the customers as they also want their credit card info secured. Most of the commercial websites use Microsoft sql (MSsql) and Oracle database servers. MS sql still owns the market because the price is very low. While Oracle servers come with high price. Well some time ago Oracle had claimed itself to be “unbreakable” But hackers took it as a challenge and showed lots of bugs in it also !! I was addicted to hacking of database servers from a few months. So I just decided to share the knowledge with others. Well the things discussed here are not discovered by me ok. Yeah I experimented with them a lot.

user will type his login name and password in login.htm page and click the submit button. The value of the text boxes will be passed to the logincheck.asp page where it will be checked using the query string. If it doesn't get an entry satisfying the query and will reach end of file a message of login failed will be displayed. Every thing seems to be OK. But wait a minute. Think again. Is every thing really OK ?!! What about the query ?!! Is it OK. Well if you have made a page like this then a hacker can easily login successfully without knowing the password. How ? Lets look at the querry again.

"Select * from table1 where login='"&log& "' and password='" &pwd& "' "

Now if a user types his login name as "Chintan" and password as "h4x3r" then these values will pass to the asp page with post method and then the above query will become

"Select * from table1 where login=' Chintan ' and password=' h4x3r ' "

Thats fine. There will be an entry Chintan and h4x3r in login and password fields in the database so we will receive a message as login successful. Now what if I type loginname as "Chintan" and password as
hi' or 'a'='a in the password text box ? The query will become as follows:

"Select * from table1 where login=' Chintan ' and password=' hi' or 'a'='a ' "

And submit and bingo!!!!! I will get the message as Login successful !! Did you see the smartness of hacker which was due to carelessness of web designer ? !!
The query gets satisfied as query changes and password needs to 'hi' or 'a' needs to be equal to 'a'. Clearly password is not 'hi' but at the same time 'a'='a' . So condition is satisfied. And a hacker is in with login "Chintan" !! You can try the following in the password text box if the above doesn't work for some websites:

hi" or "a"="a
hi" or 1=1 --
hi' or 1=1 --
hi' or 'a'='a
hi') or ('a'='a
hi") or ("a"="a

Here above -- will make the rest of the query string to be a comment other conditions will not be checked. Similary you can provide

Chintan ' --
Chintan " --

or such types of other possibilites in the login name textbox and password as anything which might let you in. Because in the query string only login name is checked as "Chintan" and rest is ignored due to --. Well if you are lucky enough you get such a website were the webdesigner has done the above mistake and then you will be able to login as any user !!!

IMP NOTE: Hey guys I have put up a page where you can experiment for yourself about the sql injection vulnerablity. Just go to www33.brinkster.com/chintantrivedi/login.htm
More advance hacking of Databases using ODBC error messages!!!

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