Continuing with sharing my further experience around Ethical Hacking learning journey.
Was occupied with quite a few things on personal front recently hence couldn’t go with the speed I wanted but could juice out some productivity in the form of some reading and some practical exercises.
On the practical side, tried RCE on few Bugcrowd program sites though couldn’t succeed yet 😐 Also, the learning and discussions journey continued with awesome Santhosh Tuppad. So recently he gave me around ten exercises to crack. Let’s see how I approached them one by one.
In the first exercise, I was supposed to crack username and password of a dummy login page. The hint was left in the source code that Base64 encoded value of username is password. I guess the agenda was to get the learner familiar with the encoding thing and to check whether he/she is checking the source code for hints. It took me a minute or so to use an online encoder to get the password expected value. However, due to some technical glitch in the dummy exercise application, it was not letting me get through(the error was genuine so it looked like expected working where access was denied).
Hence, even though my answer was right, I felt that it is not and kept on searching and trying new things. This technical glitch pushed me a for days where I kept on trying different things to crack through. Below are few things I tried, I know some of them are silly but I tried them anyway.
- Admin as username and password as many sites actually have such password for admin panels
- UserName as username and password, pwd as password (Hint from source code)
- admin / admin123 as username and password (again from past experience and usual username-password patterns)
- santhoshtuppad as username and password
- santhoshtuppad as username and c2FudGhvc2h0dXBwYWQ= as password (The Correct answer, which I got to know only after trying everything)
- comment as password (Hint from source code)
- value of comment encoded in Base 64 as password (Hint from source code)
- empty username, password
- single space as username and password
- Enabled token ID field on UI and tried SQL injection, 1=1′, 1=1–, 2=2–, and others (Tried SQL injection on CSRF token field by enabling it
- Tried SQL Injection on username and password
- Used tamper data plugin to play with parameters passed
- Tampered cookie values
- Added debug points using developer tool trying to understand the flow through script
- Tried changing the method TYPE to GET from POST with same parameters and request data and executed same
- Went through integrated scripts as well
- Tried for context variations, /one/admin
- Looked for XML-RPC
- Knowing MySQL, tried few queries on mysql / information_schema, users table, etc. (as part of SQL injection)
- Tried /exercise/one/admin as well with several credentials
- Tampering the POST request
The goal was to try dummy username and password in all the forms one by one and finding out the best error message and also explaining why other error messages are not recommended.
Here are my findings:
- The password you entered for admin is incorrect.
- Invalid username / password
- Wrong password.
- The username doesn’t exist
I put my money on would be on message#2.
While 3 and 4 clearly tell me if particular username I am using is registered with the system or not, which narrows down my target zone. OR
It might also violate privacy as it tells me if a particular user is present/registered on system or not.
Message#1 is basically an incorrect message as it always throws standard message even if a user is not registered. So this, in turn, might confuse the registered user.