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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 7
https://datatracker.ietf.org/doc/draft-intra-handshake-fail/
disclosure@vulncheck.com
https://github.com/CCC-Attestation/attested-tls-poc
disclosure@vulncheck.com
https://github.com/CCC-Attestation/attested-tls-poc/pull/58
disclosure@vulncheck.com
https://github.com/CCC-Attestation/attested-tls-poc/tree/5b6c5374b3fe8b671906c8…
disclosure@vulncheck.com
https://github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d…
disclosure@vulncheck.com
https://github.com/muhammad-usama-sardar/intra-handshake.fail
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-throu…
disclosure@vulncheck.com