CVE-2022-38023

A flaw was found in samba. The Netlogon RPC implementations may use the rc4-hmac encryption algorithm, which is considered weak and should be avoided even if the client supports more modern encryption types. This issue could allow an attacker who knows the plain text content communicated between the samba client and server to craft data with the same MD5 calculation and replace it without being detected.

Mitigation

Users can disable MD5-based NetLogon by adding the following snippet to their smb.conf

reject md5 clients = yes   

in case there's still need to allow SMB to authenticate to MD5-based NetLogon servers, it's possible to explicitly
enable it per-server based:

 server reject md5 schannel:<SERVERNAME>$ = no