CVE-2023-2283

A vulnerability was found in libssh, where the authentication check of the
connecting client can be bypassed in thepki_verify_data_signature
function in memory allocation problems. This issue may happen if there is
insufficient memory or the memory usage is limited. The problem is caused
by the return value rc, which is initialized to SSH_ERROR and later
rewritten to save the return value of the function call
pki_key_check_hash_compatible. The value of the variable is not changed
between this point and the cryptographic verification. Therefore any error
between them calls goto error returning SSH_OK.