The audit system must be configured to audit account modification.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22377	GEN002751	SV-26520r1_rule	ECAT-1	Low

Description
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.

STIG	Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide	2013-07-03

Details

Check Text ( C-27573r1_chk )
Determine if execution of the usermod and groupmod executable are audited. # auditctl -l \| egrep '(usermod\|groupmod)' If either useradd or groupadd are not listed with a permissions filter of at least 'w', this is a finding. Determine if /etc/passwd, /etc/shadow, /etc/group, and /etc/gshadow are audited for writing. # 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 'w', this is a finding.

Check Text ( C-27573r1_chk )

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

Fix Text (F-23762r1_fix)
Configure execute auditing of the usermod and groupmod executables. Add the following to the audit.rules file: -w /usr/sbin/usermod -p x -k usermod -w /usr/sbin/groupmod -p x -k groupmod Configure append auditing of the passwd, shadow, group, and gshadow files. Add the following to the audit.rules file: -w /etc/passwd -p w -k passwd -w /etc/shadow -p w -k shadow -w /etc/group -p w -k group -w /etc/gshadow -p w -k gshadow Restart the auditd service.

Fix Text (F-23762r1_fix)

Configure execute auditing of the usermod and groupmod executables. Add the following to the audit.rules file:
-w /usr/sbin/usermod -p x -k usermod
-w /usr/sbin/groupmod -p x -k groupmod
Configure append auditing of the passwd, shadow, group, and gshadow files. Add the following to the audit.rules file:
-w /etc/passwd -p w -k passwd
-w /etc/shadow -p w -k shadow
-w /etc/group -p w -k group
-w /etc/gshadow -p w -k gshadow
Restart the auditd service.