Title

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

Discussion

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.

Check Content

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

Remove the "/etc/security/mkuser.sys.custom" file using the following command: # rm /etc/security/mkuser.sys.custom

Additional Identifiers

Rule ID: SV-215169r508663_rule

Vulnerability ID: V-215169

Group Title: SRG-OS-000001-GPOS-00001

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.