The SUSE operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-77319	SLES-12-020220	SV-92015r4_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 SUSE operating systems may be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221

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 SUSE operating systems may be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221

STIG	Date
SLES 12 Security Technical Implementation Guide	2019-10-01

Details

Check Text ( C-76875r4_chk )
Verify the SUSE operating system generates an audit record when modifications occur to the "/etc/shadow" file. Check that the following file is being watched by performing the following command on the system rules in "/etc/audit/audit.rules": # sudo grep /etc/shadow /etc/audit/audit.rules -w /etc/shadow -p wa -k account_mod If the command does not return a line, or the line is commented out, this is a finding.

Check Text ( C-76875r4_chk )

Verify the SUSE operating system generates an audit record when modifications occur to the "/etc/shadow" file.

Check that the following file is being watched by performing the following command on the system rules in "/etc/audit/audit.rules":

# sudo grep /etc/shadow /etc/audit/audit.rules

-w /etc/shadow -p wa -k account_mod

If the command does not return a line, or the line is commented out, this is a finding.

Fix Text (F-83961r2_fix)
Configure the SUSE operating system to generate an audit record when all modifications to the "/etc/shadow" file occur. Add or update the following rule to "/etc/audit/rules.d/audit.rules": -w /etc/shadow -p wa -k account_mod The audit daemon must be restarted for any changes to take effect. # sudo systemctl restart auditd.service