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VulnerabilityTrail of Bits·2 weeks ago

A few notes on AWS Nitro Enclaves: KMS integration

AWS Nitro Enclaves' integration with Key Management Service (KMS) introduces significant security considerations beyond standard cryptographic implementation, including passive attacks via data swaps and CMK substitution, and active attacks exploiting unencrypted communication channels. The article provides comprehensive threat modeling guidance covering authentication mechanisms, encryption context usage, key policy configuration, and operational risks like key rotation and regional outages. Developers must implement enclave-initiated TLS, harden KMS policies with PCR attestations, and avoid the vulnerable aws-nitro-enclaves-sdk-c library in favor of alternatives like aws-nitro-enclaves-nsm-api combined with Boto3.

Read full article at Trail of Bits

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