The SLES for vRealize must notify System Administrators and Information System Security Officers when accounts are created, or enabled when previously disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-89777	VRAU-SL-001000	SV-100427r1_rule		Medium

Description
Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply enable a new or disabled account. Notification of account enabling is one method for mitigating this risk. A comprehensive account management process will ensure an audit trail, which documents the creation of operating system user accounts and notifies System Administrators and Information System Security Officers (ISSO) that it exists. Such a process greatly reduces the risk that accounts will be surreptitiously enabled and provides logging that can be used for forensic purposes. In order to detect and respond to events that affect user accessibility and application processing, operating systems must audit account enabling actions and, as required, notify the appropriate individuals so they can investigate the event. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Description

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to simply enable a new or disabled account. Notification of account enabling is one method for mitigating this risk. A comprehensive account management process will ensure an audit trail, which documents the creation of operating system user accounts and notifies System Administrators and Information System Security Officers (ISSO) that it exists. Such a process greatly reduces the risk that accounts will be surreptitiously enabled and provides logging that can be used for forensic purposes. In order to detect and respond to events that affect user accessibility and application processing, operating systems must audit account enabling actions and, as required, notify the appropriate individuals so they can investigate the event. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

STIG	Date
VMware vRealize Automation 7.x SLES Security Technical Implementation Guide	2018-10-12

Details

Check Text ( C-89469r1_chk )
Determine if execution of the "usermod" and "groupmod" executable are audited: # auditctl -l \| egrep '(usermod\|groupmod)' If either "usermod" or "groupmod" are not listed with a permissions filter of at least "x", this is a finding. Determine if execution of the "userdel" and "groupdel" executable are audited: # auditctl -l \| egrep '(userdel\|groupdel)' If either "userdel" or "groupdel" are not listed with a permissions filter of at least "x", this is a finding. Determine if execution of "useradd" and "groupadd" 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 execution of the "passwd" executable is audited: # auditctl -l \| grep “/usr/bin/passwd” If "/usr/bin/passwd" is not listed with a permissions filter of at least "x", this is a finding. Determine if /etc/passwd, /etc/shadow, /etc/group, and /etc/security/opasswd are audited for writing: # auditctl -l \| egrep '(/etc/passwd\|/etc/shadow\|/etc/group\|/etc/security/opasswd)' If any of these are not listed with a permissions filter of at least "w", this is a finding.

Check Text ( C-89469r1_chk )

Determine if execution of the "usermod" and "groupmod" executable are audited:

# auditctl -l | egrep '(usermod|groupmod)'

If either "usermod" or "groupmod" are not listed with a permissions filter of at least "x", this is a finding.

Determine if execution of the "userdel" and "groupdel" executable are audited:

# auditctl -l | egrep '(userdel|groupdel)'

If either "userdel" or "groupdel" are not listed with a permissions filter of at least "x", this is a finding.

Determine if execution of "useradd" and "groupadd" 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 execution of the "passwd" executable is audited:

# auditctl -l | grep “/usr/bin/passwd”

If "/usr/bin/passwd" is not listed with a permissions filter of at least "x", this is a finding.

Determine if /etc/passwd, /etc/shadow, /etc/group, and /etc/security/opasswd are audited for writing:

# auditctl -l | egrep '(/etc/passwd|/etc/shadow|/etc/group|/etc/security/opasswd)'

If any of these are not listed with a permissions filter of at least "w", this is a finding.

Fix Text (F-96519r1_fix)
Configure "execute" auditing of the "usermod" and "groupmod" executables. Add the following to the /etc/audit/audit.rules file: -w /usr/sbin/usermod -p x -k usermod -w /usr/sbin/groupmod -p x -k groupmod Configure "execute" auditing of the "userdel" and "groupdel" executables. Add the following to the /etc/audit/audit.rules file: -w /usr/sbin/userdel -p x -k userdel -w /usr/sbin/groupdel -p x -k groupdel 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 "execute" auditing of the "passwd" executable. Add the following to the aud.rules: -w /usr/bin/passwd -p x -k passwd Configure "write" auditing of the "passwd", "shadow", "group", and "opasswd" files. Add the following to the /etc/audit/audit.rules file: -w /etc/passwd -p wa -k passwd -w /etc/shadow -p wa -k shadow -w /etc/group -p wa -k group -w /etc/security/opasswd -p wa -k opasswd Restart the auditd service: # service auditd restart

Fix Text (F-96519r1_fix)

Configure "execute" auditing of the "usermod" and "groupmod" executables. Add the following to the /etc/audit/audit.rules file:

-w /usr/sbin/usermod -p x -k usermod
-w /usr/sbin/groupmod -p x -k groupmod

Configure "execute" auditing of the "userdel" and "groupdel" executables. Add the following to the /etc/audit/audit.rules file:

-w /usr/sbin/userdel -p x -k userdel
-w /usr/sbin/groupdel -p x -k groupdel

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 "execute" auditing of the "passwd" executable. Add the following to the aud.rules:

-w /usr/bin/passwd -p x -k passwd

Configure "write" auditing of the "passwd", "shadow", "group", and "opasswd" files. Add the following to the /etc/audit/audit.rules file:

-w /etc/passwd -p wa -k passwd
-w /etc/shadow -p wa -k shadow
-w /etc/group -p wa -k group
-w /etc/security/opasswd -p wa -k opasswd

Restart the auditd service:

# service auditd restart