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.

From VMware vRealize Automation 7.x SLES Security Technical Implementation Guide

Part of SRG-OS-000004-GPOS-00004

Associated with: CCI-000018

SV-100119r1_rule 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.

Vulnerability discussion

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.

Check content

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

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

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