The klogin daemon must be disabled on AIX.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-91397	AIX7-00-003078	SV-101495r1_rule		Medium

Description
The klogin service offers a higher degree of security than traditional rlogin or telnet by eliminating most clear-text password exchanges on the network. However, it is still not as secure as SSH, which encrypts all traffic. If using klogin to log in to a system, the password is not sent in clear text; however, if using "su" to another user, that password exchange is open to detection from network-sniffing programs. The recommendation is to use SSH wherever possible instead of klogin. If the klogin service is used, use the latest Kerberos version available and make sure that all the latest patches are installed.

Description

The klogin service offers a higher degree of security than traditional rlogin or telnet by eliminating most clear-text password exchanges on the network. However, it is still not as secure as SSH, which encrypts all traffic. If using klogin to log in to a system, the password is not sent in clear text; however, if using "su" to another user, that password exchange is open to detection from network-sniffing programs. The recommendation is to use SSH wherever possible instead of klogin. If the klogin service is used, use the latest Kerberos version available and make sure that all the latest patches are installed.

STIG	Date
IBM AIX 7.x Security Technical Implementation Guide	2020-02-24

Details

Check Text ( C-90551r1_chk )
From the command prompt, execute the following command: # grep "^klogin[[:blank:]]" /etc/inetd.conf If there is any output from the command, this is a finding.

Fix Text (F-97595r1_fix)
In "/etc/inetd.conf", comment out the "klogin" entry by running command: # chsubserver -r inetd -C /etc/inetd.conf -d -v 'klogin' -p 'tcp' Restart inetd: # refresh -s inetd