A vulnerability was found in Samba's SMB2 packet signing mechanism. The SMB2 packet signing is not enforced if an admin configured "server signing = required" or for SMB2 connections to Domain Controllers where SMB2 packet signing is mandatory. This flaw allows an attacker to perform attacks, such as a man-in-the-middle attack, by intercepting the network traffic and modifying the SMB2 messages between client and server, affecting the integrity of the data.
https://www.samba.org/samba/security/CVE-2023-3347.html
https://bugzilla.redhat.com/show_bug.cgi?id=2222792
https://access.redhat.com/security/cve/CVE-2023-3347