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AIX /etc/security/mkuser.sys.custom file must not exist unless it is needed for customizing a new user account.


Overview

Finding ID Version Rule ID IA Controls Severity
V-215169 AIX7-00-001000 SV-215169r508663_rule Medium
Description
The "/etc/security/mkuser.sys.custom" is called by "/etc/security/mkuser.sys" to customize the new user account when a new user is created, or a user is logging into the system without a home directory. An improper "/etc/security/mkuser.sys.custom" script increases the risk that non-privileged users may obtain elevated privileges. It must not exist unless it is needed.
STIG Date
IBM AIX 7.x Security Technical Implementation Guide 2021-03-10

Details

Check Text ( C-16367r293958_chk )
Check if the "/etc/security/mkuser.sys.custom" file exists:
# ls /etc/security/mkuser.sys.custom

If the above command shows the file exists, this is a finding.
Fix Text (F-16365r293959_fix)
Remove the "/etc/security/mkuser.sys.custom" file using the following command:

# rm /etc/security/mkuser.sys.custom