Cloud Metadata Case Study: Request for Instance Credentials Blocked Before Any Connection Is Made

Tue, 29 Sep 2026 00:00:00 +0000

Every major cloud runs a metadata service at the same address, 169.254.169.254, reachable from inside each virtual machine. Among other things it hands out the machine’s own credentials: on AWS, for example, the temporary keys of the role the instance runs as. An agent on a cloud machine that gets talked into fetching that address can leak keys that carry every permission the machine’s role has in the cloud account.

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Cloud Metadata Case Study: Request for Instance Credentials Blocked Before Any Connection Is Made