جزئیات آسیب‌پذیری

CCC Attestation SIG attested-tls-poc through commit 731ca82 fails to bind early attestation Evidence to the TLS connection, allowing attackers to relay valid Evidence from a genuine attester. Attackers holding an extracted attested TLS private key can forward the relying party's nonce to a genuine attester and replay its Evidence to impersonate the attested workload and intercept data.

• https://github.com/CCC-Attestation/attested-tls-poc/pull/58 patchtechnical-descriptionissue-tracking
• https://github.com/CCC-Attestation/attested-tls-poc/tree/5b6c5374b3fe8b671906c8ab32f6134d9c3da26d/relay-attacks-formal technical-description
• https://github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl_tls13_generic.c#L430-L436 technical-description
• https://datatracker.ietf.org/doc/draft-intra-handshake-fail/ technical-description
• https://github.com/muhammad-usama-sardar/intra-handshake.fail technical-description
• https://github.com/CCC-Attestation/attested-tls-poc product
• https://www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca82-attestation-relay-attack third-party-advisory