In addition to auditing new user and group accounts, these watches will alert the system administrator(s) to any modifications. Any unexpected users, groups, or modifications must be investigated for legitimacy.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-89469	VRAU-SL-000020	SV-100119r1_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 create a new account. Auditing of account creation mitigates this risk. To address access requirements, many operating systems may 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 create a new account. Auditing of account creation mitigates this risk. To address access requirements, many operating systems may 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-89161r1_chk )
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)' \| grep perm=a If any of these are not listed with a permissions filter of at least "a", this is a finding. Expected result: LIST_RULES: exit,always watch=/etc/passwd perm=a key=passwd LIST_RULES: exit,always watch=/etc/shadow perm=a key=shadow LIST_RULES: exit,always watch=/etc/group perm=a key=group LIST_RULES: exit,always watch=/etc/gshadow perm=a key=gshadow

Check Text ( C-89161r1_chk )

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)' | grep perm=a

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

Expected result:
LIST_RULES: exit,always watch=/etc/passwd perm=a key=passwd
LIST_RULES: exit,always watch=/etc/shadow perm=a key=shadow
LIST_RULES: exit,always watch=/etc/group perm=a key=group
LIST_RULES: exit,always watch=/etc/gshadow perm=a key=gshadow

Fix Text (F-96211r1_fix)
Configure append auditing of the passwd, shadow, group, and gshadow files. Run the dodscript with the following command as root: # /etc/dodscript.sh # echo '-w /etc/gshadow -p a -k gshadow' >> /etc/audit/audit.rules Restart the auditd service. # service auditd restart OR Configure append auditing of the passwd, shadow, group, and gshadow files by running the following commands: # echo '-w /etc/passwd -p a -k passwd' >> /etc/audit/audit.rules # echo '-w /etc/shadow -p a -k shadow' >> /etc/audit/audit.rules # echo '-w /etc/group -p a -k group' >> /etc/audit/audit.rules # echo '-w /etc/gshadow -p a -k gshadow' >> /etc/audit/audit.rules Restart the auditd service: # service auditd restart

Fix Text (F-96211r1_fix)

Configure append auditing of the passwd, shadow, group, and gshadow files. Run the dodscript with the following command as root:

# /etc/dodscript.sh
# echo '-w /etc/gshadow -p a -k gshadow' >> /etc/audit/audit.rules

Restart the auditd service.
# service auditd restart

OR

Configure append auditing of the passwd, shadow, group, and gshadow files by running the following commands:

# echo '-w /etc/passwd -p a -k passwd' >> /etc/audit/audit.rules
# echo '-w /etc/shadow -p a -k shadow' >> /etc/audit/audit.rules
# echo '-w /etc/group -p a -k group' >> /etc/audit/audit.rules
# echo '-w /etc/gshadow -p a -k gshadow' >> /etc/audit/audit.rules

Restart the auditd service:
# service auditd restart