CVE-2023-0361

A timing side-channel in the handling of RSA ClientKeyExchange messages was
discovered in GnuTLS. This side-channel can be sufficient to recover the
key encrypted in the RSA ciphertext across a network in a Bleichenbacher
style attack. To achieve a successful decryption the attacker would need to
send a large amount of specially crafted messages to the vulnerable server.
By recovering the secret from the ClientKeyExchange message, the attacker
would be able to decrypt the application data exchanged over that
connection.

Bugs

• <https://gitlab.com/gnutls/gnutls/-/issues/1050&gt;

Notes