While this URL is a legitimate tool for AWS Instance Profiles, it is also a primary target for Server-Side Request Forgery (SSRF) attacks. Here is a deep dive into what this URL does, why it’s a risk, and how to protect your infrastructure. What is 169.254.169.254?

The purpose of this URL is to allow AWS EC2 instances to fetch temporary security credentials that are associated with an IAM role. When an EC2 instance is launched, it can be assigned an IAM role. This IAM role defines what AWS resources the instance can access. Instead of having to manage and embed long-term credentials on the instance, AWS provides temporary security credentials through this metadata service.

On Linux, you can use iptables to restrict access to the metadata IP address to only specific system users or processes. Conclusion

The URL http://169.254.169.254/latest/meta-data/iam/security-credentials/ is used by AWS EC2 instances to fetch temporary security credentials from the AWS Instance Metadata Service.