While testing a company's cloud deployment, you obtain low-privilege shell access to a web application running on an Amazon EC2 instance that still permits requests to the default Instance Metadata Service v1 (IMDSv1) endpoint. To assess whether you can pivot and leverage the instance's permissions against other AWS resources, which immediate action should you take?
IMDSv1 allows any local process that can make HTTP requests to access the instance metadata endpoint at 169.254.169.254 without additional protections. By requesting the path /latest/meta-data/iam/security-credentials/ (and the subsequent role name), an attacker can harvest the temporary access key, secret key, and session token attached to the instance profile. These credentials can then be used with AWS CLI or SDKs to enumerate and interact with other AWS services under that role's privileges. DNS probing or internal network scanning will not reveal the needed AWS credentials, and ARP poisoning the VPC router is ineffective because intra-VPC traffic is virtualized and not exposed to layer-2 attacks.
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What is the Instance Metadata Service (IMDS)?
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What are temporary AWS credentials in the instance metadata?
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Why is IMDSv1 considered less secure than IMDSv2?
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What is the AWS Instance Metadata Service (IMDS)?
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What are temporary AWS keys and how are they used?
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What security risks are associated with IMDSv1?
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