Will Bengtston walks us through techniques Netflix uses to protect credentials in AWS:
Scope
In this post, we’ll discuss how to prevent or mitigate compromise of credentials due to certain classes of vulnerabilities such as Server Side Request Forgery (SSRF) and XML External Entity (XXE) injection. If an attacker has remote code execution (RCE) or local presence on the AWS server, these methods discussed will not prevent compromise. For more information on how the AWS services mentioned work, see the Background section at the end of this post.
Protecting Your Credentials
There are many ways that you can protect your AWS temporary credentials. The two methods covered here are:
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Enforcing where API calls are allowed to originate from.
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Protecting the EC2 Metadata service so that credentials cannot be retrieved via a vulnerability in an application such as Server Side Request Forgery (SSRF).
Read the whole thing if you’re an AWS user.