. These credentials were like a skeleton key to the rest of the AWS kingdom. The Birth of the Token My Hands-On with AWS EC2 Instance Metadata Service
This forces the PUT token method — but as shown, your keyword is exactly that method, so it doesn’t prevent the attack; it only prevents IMDSv1 fallback.
This is a request to the AWS EC2 instance metadata service (IMDSv2), which uses the IP address 169.254.169.254 — a link-local address reserved for instance metadata.
When decoded, this string translates to:
This command is essential for securely interacting with the on Amazon Elastic Compute Cloud (EC2) instances. In this article, we will explore everything you need to know about this command – what it does, why it matters, how to use it correctly, and the security best practices that surround it.
The AWS metadata service is a RESTful API that provides information about an instance. The service is accessible only from within the instance and is used to retrieve metadata about the instance, such as its ID, type, and IP address. The service is typically used by applications running on the instance to access other AWS resources.
The keyword refers to the curl command used to retrieve a session token from the Amazon Web Services (AWS) Instance Metadata Service Version 2 (IMDSv2) .
The command curl -H "X-aws-ec2-metadata-token-ttl-seconds: 21600" -X PUT "http://169.254.169"
The use of curl with URLs like http://169.254.169.254/latest/api/token represents a powerful capability in cloud computing, especially for automation, configuration management, and dynamic credential management. Understanding how to leverage these tools effectively can significantly enhance your ability to manage and interact with cloud resources securely. Whether you're a seasoned professional or just getting started, the combination of curl and metadata services offers a versatile toolkit for a wide range of applications.
Set the metadata HTTP token hop limit to 1 for containerized environments. This prevents containers running inside a pod or docker environment from reaching the host instance's metadata service.