Title

The audit system must be configured to audit account creation. (Cat III impact)

Discussion

If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises, and damages incurred during a system compromise.

Check Content

Determine if execution of the useradd and groupadd executable are audited. # auditctl -l | egrep '(useradd|groupadd)' If either useradd or groupadd are not listed with a permissions filter of at least 'x', this is a finding. Determine if /etc/passwd, /etc/shadow, /etc/group, and /etc/gshadow are audited for appending. # auditctl -l | egrep '(/etc/passwd|/etc/shadow|/etc/group|/etc/gshadow)' If any of these are not listed with a permissions filter of at least 'a', this is a finding.

Fix Text

Configure execute auditing of the useradd and groupadd executables. Add the following to audit.rules: -w /usr/sbin/useradd -p x -k useradd -w /usr/sbin/groupadd -p x -k groupadd Configure append auditing of the passwd, shadow, group, and gshadow files. Add the following to audit.rules: -w /etc/passwd -p a -k passwd -w /etc/shadow -p a -k shadow -w /etc/group -p a -k group -w /etc/gshadow -p a -k gshadow Restart the auditd service. # rcauditd restart OR # service auditd restart

Additional Identifiers

Rule ID: SV-45305r1_rule

Vulnerability ID: V-22376

Group Title: GEN002750

Expert Comments

CCIs tied to check.

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