Australian Cyber Security Centre (ACSC) ISM Official
Rules and Groups employed by this XCCDF Profile
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Verify Proper Storage and Existence of Password Hashes
By default, password hashes for local accounts are stored in the second field (colon-separated) in <code>/etc/shadow</code>. This file should be re...Group -
Verify All Account Password Hashes are Shadowed
If any password hashes are stored in <code>/etc/passwd</code> (in the second field, instead of an <code>x</code> or <code>*</code>), the cause of t...Rule Medium Severity -
Prevent Login to Accounts With Empty Password
If an account is configured for password authentication but does not have an assigned password, it may be possible to log into the account without ...Rule High Severity -
Restrict Root Logins
Direct root logins should be allowed only for emergency use. In normal situations, the administrator should access the system via a unique unprivil...Group -
Verify Only Root Has UID 0
If any account other than root has a UID of 0, this misconfiguration should be investigated and the accounts other than root should be removed or h...Rule High Severity -
Ensure that System Accounts Do Not Run a Shell Upon Login
Some accounts are not associated with a human user of the system, and exist to perform some administrative functions. Should an attacker be able to...Rule Medium Severity -
System Accounting with auditd
The audit service provides substantial capabilities for recording system activities. By default, the service audits about SELinux AVC denials and c...Group -
Enable auditd Service
The <code>auditd</code> service is an essential userspace component of the Linux Auditing System, as it is responsible for writing audit records to...Rule Medium Severity -
Configure auditd Rules for Comprehensive Auditing
The <code>auditd</code> program can perform comprehensive monitoring of system activity. This section describes recommended configuration settings ...Group -
Record Events that Modify the System's Network Environment
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...Rule Medium Severity -
Record Attempts to Alter Process and Session Initiation Information
The audit system already collects process information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>auge...Rule Medium Severity -
Ensure auditd Collects System Administrator Actions
At a minimum, the audit system should collect administrator actions for all users and root. If the <code>auditd</code> daemon is configured to use ...Rule Medium Severity -
Record Events that Modify User/Group Information
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls
At a minimum, the audit system should collect file permission changes for all users and root. Note that the "-F arch=b32" lines should be present e...Group -
Record Events that Modify the System's Discretionary Access Controls - chmod
At a minimum, the audit system should collect file permission changes for all users and root. If the <code>auditd</code> daemon is configured to us...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - chown
At a minimum, the audit system should collect file permission changes for all users and root. If the <code>auditd</code> daemon is configured to us...Rule Medium Severity -
Record Execution Attempts to Run SELinux Privileged Commands
At a minimum, the audit system should collect the execution of SELinux privileged commands for all users and root.Group -
Record Any Attempts to Run chcon
At a minimum, the audit system should collect any execution attempt of the <code>chcon</code> command for all users and root. If the <code>auditd</...Rule Medium Severity -
Record Any Attempts to Run restorecon
At a minimum, the audit system should collect any execution attempt of the <code>restorecon</code> command for all users and root. If the <code>aud...Rule Medium Severity -
Record Any Attempts to Run semanage
At a minimum, the audit system should collect any execution attempt of the <code>semanage</code> command for all users and root. If the <code>audit...Rule Medium Severity -
Record Any Attempts to Run setfiles
At a minimum, the audit system should collect any execution attempt of the <code>setfiles</code> command for all users and root. If the <code>audit...Rule Medium Severity -
Record Any Attempts to Run setsebool
At a minimum, the audit system should collect any execution attempt of the <code>setsebool</code> command for all users and root. If the <code>audi...Rule Medium Severity -
Record Any Attempts to Run seunshare
At a minimum, the audit system should collect any execution attempt of the <code>seunshare</code> command for all users and root. If the <code>audi...Rule Medium Severity -
Record Unauthorized Access Attempts Events to Files (unsuccessful)
At a minimum, the audit system should collect unauthorized file accesses for all users and root. Note that the "-F arch=b32" lines should be presen...Group -
Ensure auditd Collects Unauthorized Access Attempts to Files (unsuccessful)
At a minimum the audit system should collect unauthorized file accesses for all users and root. If the <code>auditd</code> daemon is configured to ...Rule Medium Severity -
Record Information on Kernel Modules Loading and Unloading
To capture kernel module loading and unloading events, use following lines, setting ARCH to either b32 for 32-bit system, or having two lines for b...Group -
Ensure auditd Collects Information on Kernel Module Loading and Unloading
To capture kernel module loading and unloading events, use following lines, setting ARCH to either b32 for 32-bit system, or having two lines for b...Rule Medium Severity -
Record Attempts to Alter Logon and Logout Events
The audit system already collects login information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenr...Group -
Record Attempts to Alter Logon and Logout Events
The audit system already collects login information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenr...Rule Medium Severity -
Record Attempts to Alter Logon and Logout Events - faillock
The audit system already collects login information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenr...Rule Medium Severity -
Record Attempts to Alter Logon and Logout Events - lastlog
The audit system already collects login information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenr...Rule Medium Severity -
Record Attempts to Alter Logon and Logout Events - tallylog
The audit system already collects login information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenr...Rule Medium Severity -
Record Information on the Use of Privileged Commands
At a minimum, the audit system should collect the execution of privileged commands for all users and root.Group -
Ensure auditd Collects Information on the Use of Privileged Commands
The audit system should collect information about usage of privileged commands for all users. These are commands with suid or sgid bits on and they...Rule Medium Severity -
Records Events that Modify Date and Time Information
Arbitrary changes to the system time can be used to obfuscate nefarious activities in log files, as well as to confuse network services that are hi...Group -
Record attempts to alter time through adjtimex
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...Rule Medium Severity -
Record Attempts to Alter Time Through clock_settime
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...Rule Medium Severity -
Record attempts to alter time through settimeofday
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...Rule Medium Severity -
Record Attempts to Alter Time Through stime
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...Rule Medium Severity -
Record Attempts to Alter the localtime File
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...Rule Medium Severity -
Configure auditd Data Retention
The audit system writes data to <code>/var/log/audit/audit.log</code>. By default, <code>auditd</code> rotates 5 logs by size (6MB), retaining a ma...Group -
Configure auditd flush priority
The <code>auditd</code> service can be configured to synchronously write audit event data to disk. Add or correct the following line in <code>/etc/...Rule Medium Severity -
Set number of records to cause an explicit flush to audit logs
To configure Audit daemon to issue an explicit flush to disk command after writing <xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_aud...Rule Medium Severity -
Include Local Events in Audit Logs
To configure Audit daemon to include local events in Audit logs, set <code>local_events</code> to <code>yes</code> in <code>/etc/audit/auditd.conf<...Rule Medium Severity -
Resolve information before writing to audit logs
To configure Audit daemon to resolve all uid, gid, syscall, architecture, and socket address information before writing the events to disk, set <co...Rule Low Severity -
Set type of computer node name logging in audit logs
To configure Audit daemon to use a unique identifier as computer node name in the audit events, set <code>name_format</code> to <code><xccdf-1.2:su...Rule Medium Severity -
Write Audit Logs to the Disk
To configure Audit daemon to write Audit logs to the disk, set <code>write_logs</code> to <code>yes</code> in <code>/etc/audit/auditd.conf</code>. ...Rule Medium Severity -
System Accounting with auditd
The <code>auditd</code> program can perform comprehensive monitoring of system activity. This section makes use of recommended configuration settin...Group -
Configure auditing of unsuccessful file accesses
Ensure that unsuccessful attempts to access a file are audited. The following rules configure audit as described above: <pre>## Unsuccessful file ...Rule Medium Severity -
Configure auditing of successful file accesses
Ensure that successful attempts to access a file are audited. The following rules configure audit as described above: <pre>## Successful file acce...Rule Medium Severity
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