SQL Injection in The HTTP Custom Header

It has been a long time since my last write-up. in this short write up I wanna share my last year's findings about SQL Injection that I found in the custom HTTP header request.


So, I was doing my API penetration testing for a target. let's say redacted.com and after successful login, the request has one more HTTP header in the request, User header, and the value is a username that login to the application.


POST /abcd/abcd

Authorization: token

Host: redacted.com

User: user.abc

Postman-Token: token

...


{body request}


Now, I try to change the username for IDOR possibility but the server validates it by giving a message with a 500 internal error code and an error message that cannot get this API access.




Because this parameter is validated it is potential also for SQL Injection, so I put basic SQL Injection to the request ‘ OR 1=1- - and send the request and with ease, the server accepts the request and gives valid information. No way :D




Okay, we got a valid SQL Injection and of course sqlmap will do the rest. But with this vulnerability, it turns out that we can also request to the server without an authorization token.



I hope you can take some points from my write-up, and I am sorry for being inactive for a couple of months. Have a nice day and keep learning!

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