Callback-url-http-3a-2f-2f169.254.169.254-2flatest-2fmeta Data-2fiam-2fsecurity Credentials-2f [portable] -

AWS has introduced several mechanisms to protect against this type of credential exfiltration. 1. Enforce IMDSv2 (Instance Metadata Service Version 2)

A link-local address accessible only from within the virtual machine.

"Code" : "Success", "LastUpdated" : "2023-10-01T12:00:00Z", "Type" : "AWS-HMAC", "AccessKeyId" : "ASIAIOSFODNN7EXAMPLE", "SecretAccessKey" : "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY", "Token" : "IQoJb3JpZ2luX2VjELz...", "Expiration" : "2023-10-01T18:00:00Z"

Containers running on EC2 may have access to the host’s IMDS. Mitigations:

This specific path returns the name of the IAM role assigned to the instance. A follow-up request to .../security-credentials/[role-name] would return the AccessKeyId , SecretAccessKey , and Token .

: The URL-encoded schema identifier separating the protocol from the host.

This is not a theoretical risk. Several high-profile incidents and campaigns have exploited this exact chain.

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