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README.md
HackerChat
HackerChat is the hottest new chat app for hackers. Can you recover the secret message sent to the HackerChat admin?
About the Challenge
We are given a website that has multiple functionality such as send msg to another user, login, register, etc.
How to Solve?
Register first and then login to the website and you will see this page
You will notice there are 2 API endpoints when accessing dashboard page
- /api/chat
- /api/search
There is a SQL injection vulnerability on /api/search endpoint on search_term parameter. Input ' or true-- in that parameter to print all the user information
As we can see, we found admin username and there is an interesting notes there
secret reminder: 8vqB5xhrTdPzPDXpSpOTY3oTB3ExpZJdrsFGm/hq/yE=
The secret reminder refers to the JWT secret, which is required in order to modify the value of the Authorization token from your username (For example testiiii) to admin
Now, go to /api/chat history and don't forget to change the Authorization token and voilà you will obtain the flag
flag{Unbr34k4bl3_Ch@t_S3curity_uWu_2lgla}