Security Audit

[sayamkanwar]

Hi,
I have done several tests on Fabrik and I have compiled the results.
The tests are located in 'security_audit/TESTS.md', please have a look at it I have found several vulnerabilities in Fabrik.
Thanks

@Ram81 @PalashTanejaPro @utsavgarg

[palash-taneja]

Impressive work on the report, it's quite extensive and makes it possible for developers to fix the highlighted problems.

Just a few things

1. Does the long string in buffer overflow cause the server to crash and provide an empty response? If so then this might need immediate fixing as fabrik.cloudcv.org will be vulnerable to server crashes.

2. I don't understand what the CSRF vulnerability is doing? Are you able to guess the tokens without using inspect element? If so then that might also be a high priority fix.

I'll give you a 1-day extension to clarify this but otherwise, this looks good to me :)

@Ram81 @utsavgarg Should the student create this .md file with the vulns or should we take the creation of issues related to them as the submission? I think issues would be more suitable for this purpose.

[sayamkanwar]

Thanks @PalashTanejaPro,

1. Yes, I tried to play around with the API with different inputs and in other cases it was giving a valid JSON response whereas when I passed an arbitrarily large string, it resulted in buffer overflow. I also tried this in the browser. It returned the error 'The page isn't working' whereas it was working fine for smaller length inputs.

2. i) So basically I inspected the source code of 0.0.0.0:8000/accounts/login/. I found a hidden input value with the name 'csrfmiddlewaretoken' which is being generated by the server and is dynamic and it's obvious that it's there to prevent login requests from other origins but I believe the fault here is that it's being rendered in the HTML which makes it easy for hackers to exploit the login. In my opinion, values like these should be maintained at the backend only and should be passed to the server from backend itself instead of rendering into the web allowing login request from other origins.
   ii) Another fault: this login page contains a cookie named 'csrftoken', so I opened the console and typed console.log(document.cookie) and it returned _ga=GA1.1.860592203.1541516212; _gid=GA1.1.1409113918.1542232998; csrftoken=u9BRRc8f2Uyg9EfLpO0nLaSgR113w7Pbg63GZ9RKy0wxgRZ4TXfvfdmyaF1ZdqSC. So the problem here is the csrftoken cookie is not set to HTTPOnly which is why it is accessible through Javascript and hence it can be easily fetched with one line of code. If it is set to HTTPOnly like the session cookie then this problem will be resolved.

[Ram81]

@PalashTanejaPro I agree with you, we have to create issues and get the fixes done asap.

[Ram81]

@sayamkanwar nice work pointing this out, we are still working on login feature and it's not complete yet though. We have to get the fixes for these issues done as fast as possible.

[sayamkanwar]

Thank you @Ram81! :)
Let me know how do I have to submit this task then. If I have to create the issues, I'll do it.

[palash-taneja]

@sayamkanwar great! You can mention this stuff in the issues you create then. Just create the issues and we'll approve the task for you :)

[sayamkanwar]

So I have to create the issues for each vulnerability or just 1 issue for all?

[Ram81]

@sayamkanwar You can mention all of them in a single issue.

[Ram81]

Nice work

[sayamkanwar]

Okay thank you, I'll create one!

[sayamkanwar]

Created the issue: #459