: The attacker aims to steal the temporary credentials, which can then be used from outside the AWS environment to gain unauthorized access to your cloud resources, such as S3 buckets or other EC2 instances. IMDS Versioning :
Securing your cloud environment against metadata theft requires a multi-layered defense strategy. AWS and security professionals recommend the following best practices: 1. Enforce IMDSv2 (The Definitive Solution) : The attacker aims to steal the temporary
: IAM roles allow for fine-grained access control, ensuring that instances only have access to the resources they need to perform their tasks. Enforce IMDSv2 (The Definitive Solution) : IAM roles
If you append the specific IAM role name to the end of that URL (e.g., .../security-credentials/my-ec2-role ), the service will return a JSON object containing: SecretAccessKey Token (Session Token) Expiration Date AWS recommends this as a defense-in-depth measure
While the IMDS is designed to be non-routable, it can be reached from outside the instance in some scenarios, such as when a network appliance (e.g., a virtual router) forwards packets to the IMDS address or when the instance's source/destination check is disabled. To prevent external access, configure local firewall rules (e.g., iptables on Linux or Windows Firewall) to destined for 169.254.169.254 from any process except those that absolutely require it. AWS recommends this as a defense-in-depth measure.
Stealing IAM Credentials from the Instance Metadata Service * To determine if the EC2 instance has an IAM role associated with it, Hacking The Cloud
The string request-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fmeta data-2Fiam-2Fsecurity credentials-2F is a URL-encoded log entry or search query representing an attempt to access a highly sensitive endpoint in cloud computing: the AWS Instance Metadata Service (IMDS). Specifically, it targets the IAM security credentials of an ec2 instance.