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Prevent user from disabling the screen lock

An XCCDF Rule

Description

The tmux terminal multiplexer is used to implement automatic session locking. It should not be listed in /etc/shells.

Rationale

Not listing tmux among permitted shells prevents malicious program running as user from lowering security by disabling the screen lock.

ID
xccdf_org.ssgproject.content_rule_no_tmux_in_shells
Severity
Low
References
Updated

Remediation Templates

An Ansible Snippet

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - DISA-STIG-OL08-00-020042
  - NIST-800-53-CM-6

A Shell Script

# Remediation is applicable only in certain platforms
if rpm --quiet -q kernel; then
if grep -q 'tmux\s*$' /etc/shells ; then
	sed -i '/tmux\s*$/d' /etc/shells
fi