The Photon operating system must audit all account modifications.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-256518	SRG-OS-000239-GPOS-00089	PHTN-30-000043	SV-256518r991551_rule	2024-12-16	1

Description
Once an attacker establishes 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 modify an existing account. Auditing account modification actions provides logging that can be used for forensic purposes. Satisfies: SRG-OS-000239-GPOS-00089, SRG-OS-000303-GPOS-00120

ℹ️ Check
At the command line, run the following command: # auditctl -l \| grep -E "(/etc/passwd\|/etc/shadow\|/etc/group\|/etc/gshadow)" Expected result: -w /etc/passwd -p wa -k passwd -w /etc/shadow -p wa -k shadow -w /etc/group -p wa -k group -w /etc/gshadow -p wa -k gshadow If the output does not match the expected result, this is a finding. Note: This check depends on the auditd service to be in a running state for accurate results. The auditd service is enabled in control PHTN-30-000013.

ℹ️ Check

At the command line, run the following command: # auditctl -l | grep -E "(/etc/passwd|/etc/shadow|/etc/group|/etc/gshadow)" Expected result: -w /etc/passwd -p wa -k passwd -w /etc/shadow -p wa -k shadow -w /etc/group -p wa -k group -w /etc/gshadow -p wa -k gshadow If the output does not match the expected result, this is a finding. Note: This check depends on the auditd service to be in a running state for accurate results. The auditd service is enabled in control PHTN-30-000013.

✔️ Fix
Navigate to and open: /etc/audit/rules.d/audit.STIG.rules Add the following lines: -w /etc/passwd -p wa -k passwd -w /etc/shadow -p wa -k shadow -w /etc/group -p wa -k group -w /etc/gshadow -p wa -k gshadow At the command line, run the following command to load the new audit rules: # /sbin/augenrules --load Note: A new "audit.STIG.rules" file is provided for placement in "/etc/audit/rules.d" that contains all rules needed for auditd. Note: An older "audit.STIG.rules" may exist if the file exists and references older "GEN" SRG IDs. This file can be removed and replaced as necessary with an updated one.

✔️ Fix

Navigate to and open: /etc/audit/rules.d/audit.STIG.rules Add the following lines: -w /etc/passwd -p wa -k passwd -w /etc/shadow -p wa -k shadow -w /etc/group -p wa -k group -w /etc/gshadow -p wa -k gshadow At the command line, run the following command to load the new audit rules: # /sbin/augenrules --load Note: A new "audit.STIG.rules" file is provided for placement in "/etc/audit/rules.d" that contains all rules needed for auditd. Note: An older "audit.STIG.rules" may exist if the file exists and references older "GEN" SRG IDs. This file can be removed and replaced as necessary with an updated one.