FreeBSD : gnutls -- certificate chain verification DoS (84ab58cf-e4ac-11d8-9b0a-000347a4fa7d)
High Nessus Plugin ID 37047
SynopsisThe remote FreeBSD host is missing one or more security-related updates.
DescriptionPatric Hornik reports on a problem in the certificate chain verification procedures of GnuTLS that may result in a denial-of-service vulnerability :
The certificate chain should be verified from last root certificate to the first certificate. Otherwise a lot of unauthorized CPU processing can be forced to check certificate signatures signed with arbitrary RSA/DSA keys chosen by attacker.
In GnuTLS the signatures are checked from first to last certificate, there is no limit on size of keys and no limit on length of certificate chain.
SolutionUpdate the affected packages.