Vulnerability in CCC-Attestation attested-tls-poc

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• datatracker.ietf.org/doc/draft-intra-handshake-fail
• github.com/CCC-Attestation/attested-tls-poc
• github.com/CCC-Attestation/attested-tls-poc/pull/58
• github.com/CCC-Attestation/attested-tls-poc/tree/5b6c5374b3fe8b671906c8ab32f6134d9c3da2…
• github.com/ionut-arm/mbedtls/blob/f4ac7593826a506fc509c83cad73786acab1d442/library/ssl_…
• github.com/muhammad-usama-sardar/intra-handshake.fail
• www.vulncheck.com/advisories/ccc-attestation-sig-attested-tls-poc-through-commit-731ca8…