Authenticated privilege retention via unchecked seteuid failure

Improper privilege-drop handling in Netatalk 1.5.0 through 4.4.2 allows remote authenticated users to retain elevated process privileges. The authentication modules log a failed seteuid() call but continue processing instead of aborting, leaving the process at its prior effective user ID. Exploitation requires a low-privileged authenticated session and an unusual privilege-change failure that upstream says attackers generally cannot force in normal deployments; successful triggering permits limited access to protected operations and data.