Demystifying AWS’ AssumeRole and sts:ExternalId

Amazon Web Services' AssumeRole operation accepts an optional parameter called "sts:ExternalId" which is intended to mitigate certain types of attacks. However, both the attacks that sts:ExternalId mitigates and how to properly use it are widely misunderstood, resulting in large numbers of vulnerable AWS-based applications. This post aims to describe what std:ExternalId does, when to use … Continue reading Demystifying AWS’ AssumeRole and sts:ExternalId