no pass needed

Filtered SQL injection

Description

It's all about who you know and I know 'admin'.

http://web.chal.csaw.io:5001

Solution

• The username is reflected back into the username field (its value attribute) after failed authentication

• By fuzzing username inputs, we can find that anything after a whitespace is removed.

• Furthermore, 'admin' is replaced non-recursively.

We can exploit an SQL injection in the username parameter. The payload is:

username=adadminmin';#&password=

This will translate to the query:

SELECT * FROM users WHERE username='admin';#

The flag is flag{wh0_n3ed5_a_p4ssw0rd_anyw4y}.