пятница, 8 августа 2014 г.

SSRF vs AWS Security

Hello everyone...

Just want to mention one attack-vector that is useful against AWS EC2 instances in some configurations. It is not rocket-science, but pretty fun and tell us about AWS Cloud security things and maybe can help us to do hardening. Actually I am talking about boring-sold SSRF vector. So if an attacker can do SSRF in our EC2 with SSRF what he can do?

Sometimes developers like to assign IAM Roles to instances. For example if it is deploy/build server, that needs to create new apps in AWS account or something else, doesn't matter - this just happens 8) And assigning roles to EC2 instances  - easiest way you can do it, because you do not need to think about how to deliver  Access Keys to the instance, how to rotate them and etc. Now back to SSRF...

So we have classic vulnerable App with boring XXE:


And...