Title

SLEM 5 must not have unnecessary account capabilities. (Cat II impact)

Discussion

Accounts providing no operational purpose provide additional opportunities for system compromise. Therefore all necessary noninteractive accounts should not have an interactive shell assigned to them.

Check Content

Verify all noninteractive SLEM 5 accounts do not have an interactive shell assigned to them with the following command: Check the system accounts on the system. > awk -F: '($7 !~ "/sbin/nologin" && $7 !~ "/bin/false"){print $1 ":" $3 ":" $7}' /etc/passwd root:0:/bin/bash nobody:65534:/bin/bash Obtain the list of authorized system accounts from the information system security officer (ISSO). If noninteractive accounts such as "games" or "nobody" are listed with an interactive shell, this is a finding.

Fix Text

Configure SLEM 5 so that all noninteractive accounts on the system have no interactive shell assigned to them. Run the following command to disable the interactive shell for a specific noninteractive user account: > sudo usermod --shell /sbin/nologin nobody

Additional Identifiers

Rule ID: SV-261358r996829_rule

Vulnerability ID: V-261358

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

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