Fetch-url-http-3a-2f-2f169.254.169.254-2flatest-2fmeta Data-2fiam-2fsecurity Credentials-2f 【UHD】

Apply the . Do not attach overly permissive roles (e.g., AdministratorAccess ) to an instance. Use AWS managed policies or custom policies that grant only the required actions on specific resources.

You can restrict your EC2 instances to only use IMDSv2 by setting the to Required in the AWS Console or via the AWS CLI. 5. Summary Table: Metadata Endpoints Endpoint / Action Meta-data Root

And receive a JSON response like:

The URL string is the internal API endpoint for the AWS Instance Metadata Service (IMDSv1), which allows applications on an EC2 instance to dynamically retrieve temporary IAM security credentials. While essential for seamless cloud authentication, this specific endpoint represents one of the most critical attack vectors in cloud security. If an application suffers from a Server-Side Request Forgery (SSRF) vulnerability, an external attacker can manipulate the server to fetch this URL, steal the temporary AWS keys, and potentially compromise the entire cloud infrastructure. What is the 169.254.169.254 Endpoint?

curl -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/iam/security-credentials/$ROLE_NAME Apply the

The use cases for this URL are numerous:

curl http://169.254.169.254/latest/meta-data/iam/security-credentials/my-app-role You can restrict your EC2 instances to only

Beyond cloud metadata, the same SSRF technique can target internal Redis, Memcached, or Docker daemons (e.g., http://127.0.0.1:2375/containers/json ). So defending against this specific URL also improves your overall network security posture.

This allows developers to avoid "hard-coding" long-term AWS keys into their code. Instead, the instance "fetches" fresh, temporary keys automatically. When everything is configured correctly, this is a highly secure, best-practice method for identity management. The Threat: SSRF and Metadata Theft including fetching security credentials.

169.254.169.254 is a special IP address used for the AWS instance metadata service. This service provides information about the instance and is used for various purposes, including fetching security credentials.