If bash is used, AIX must display logout messages.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
low	V-215309	SRG-OS-000281-GPOS-00111	AIX7-00-002128	SV-215309r958640_rule	2024-08-16	3

Description
If a user cannot explicitly end an operating system session, the session may remain open and be exploited by an attacker; this is referred to as a zombie session. Users need to be aware of whether or not the session has been terminated. Information resources to which users gain access via authentication include, for example, local workstations and remote services. Logoff messages can be displayed after authenticated sessions have been terminated. However, for some types of interactive sessions, including, for example, remote login, information systems typically send logoff messages as final messages prior to terminating sessions.

Description

If a user cannot explicitly end an operating system session, the session may remain open and be exploited by an attacker; this is referred to as a zombie session. Users need to be aware of whether or not the session has been terminated. Information resources to which users gain access via authentication include, for example, local workstations and remote services. Logoff messages can be displayed after authenticated sessions have been terminated. However, for some types of interactive sessions, including, for example, remote login, information systems typically send logoff messages as final messages prior to terminating sessions.

ℹ️ Check
Identify any users that are using the BASH shell: # cut -d: -f1,7 /etc/passwd \| grep -i bash doejohn:/bin/bash If no users are assigned the BASH shell, this is Not Applicable Verify that each BASH shell user has a ".bash_logout" file: # for home in `cut -d: -f6 /etc/passwd`; do ls -alL $home/.bash_logout; done -rwxr----- 1 doejohn staff 297 Jan 29 09:47 /home/doejohn/.bash_logout If a user does not have their ".bash_logout" file, this is a finding. Verify that each ".bash_logout" file identified above contains a logout message: # cat <user_home_directory>/.bash_logout echo "You are being disconnected." sleep 5 If the ".bash_logout" file is not configured to display a logout message, this is a finding.

ℹ️ Check

Identify any users that are using the BASH shell: # cut -d: -f1,7 /etc/passwd | grep -i bash doejohn:/bin/bash If no users are assigned the BASH shell, this is Not Applicable Verify that each BASH shell user has a ".bash_logout" file: # for home in `cut -d: -f6 /etc/passwd`; do ls -alL $home/.bash_logout; done -rwxr----- 1 doejohn staff 297 Jan 29 09:47 /home/doejohn/.bash_logout If a user does not have their ".bash_logout" file, this is a finding. Verify that each ".bash_logout" file identified above contains a logout message: # cat <user_home_directory>/.bash_logout echo "You are being disconnected." sleep 5 If the ".bash_logout" file is not configured to display a logout message, this is a finding.

✔️ Fix
Create the ".bash_logout" file if it does not exist. Add the following two lines to ".bash_logout" to display a logout message and sleep for "5" seconds: echo "You are being disconnected." sleep 5