FreeBSD : gnutls -- MD5 downgrade in TLS signatures (3de36a19-429d-11e5-9daa-14dae9d210b8)
High Nessus Plugin ID 85427
The remote FreeBSD host is missing a security-related update.
Karthikeyan Bhargavan reports : GnuTLS does not by default support MD5 signatures. Indeed the RSA-MD5 signature-hash algorithm needs to be explicitly enabled using the priority option VERIFY_ALLOW_SIGN_RSA_MD5. In the NORMAL and SECURE profiles, GnuTLS clients do not offer RSA-MD5 in the signature algorithms extension. However, we find that all GnuTLS clients still accept RSA-MD5 in the ServerKeyExchange and GnuTLS servers still accept RSA-MD5 in the ClientCertificateVerify.