Guide to the Secure Configuration of Red Hat Enterprise Linux 8
Rules, Groups, and Values defined within the XCCDF Benchmark
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Configure auditd Max Log File Size
Determine the amount of audit data (in megabytes) which should be retained in each log file. Edit the file <code>/etc/audit/auditd.conf</code>. Add or modify the following line, substituting the co...Rule Medium Severity -
Configure auditd max_log_file_action Upon Reaching Maximum Log Size
The default action to take when the logs reach their maximum size is to rotate the log files, discarding the oldest one. To configure the action taken by <code>auditd</code>, add or correct the lin...Rule Medium Severity -
Configure auditd Number of Logs Retained
Determine how many log files <code>auditd</code> should retain when it rotates logs. Edit the file <code>/etc/audit/auditd.conf</code>. Add or modify the following line, substituting <i>NUMLOGS</i>...Rule Medium Severity -
Configure auditd space_left on Low Disk Space
The <code>auditd</code> service can be configured to take an action when disk space is running low but prior to running out of space completely. Edit the file <code>/etc/audit/auditd.conf</code>. A...Rule Medium Severity -
Configure auditd space_left on Low Disk Space
The <code>auditd</code> service can be configured to take an action when disk space is running low but prior to running out of space completely. Edit the file <code>/etc/audit/auditd.conf</code>. A...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_auditd_freq" use="legacy"></xccdf-1.2:sub> records, s...Rule Medium Severity -
Write Audit Logs to the Disk
To configure Audit daemon to write Audit logs to the disk, setwrite_logstoyesin/etc/audit/auditd.conf. This is the default setting.Rule Medium Severity -
Type of hostname to record the audit event
Type of hostname to record the audit eventValue -
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 access (any other opens) This has to go last. -a a...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 access (any other opens) This has to go last. ## These...Rule Medium Severity -
Configure auditing of unsuccessful file creations
Ensure that unsuccessful attempts to create a file are audited. The following rules configure audit as described above: <pre>## Unsuccessful file creation (open with O_CREAT) -a always,exit -F arc...Rule Medium Severity -
Configure auditing of successful file creations
Ensure that successful attempts to create a file are audited. The following rules configure audit as described above: <pre>## Successful file creation (open with O_CREAT) -a always,exit -F arch=b3...Rule Medium Severity -
Configure auditing of unsuccessful file deletions
Ensure that unsuccessful attempts to delete a file are audited. The following rules configure audit as described above: <pre>## Unsuccessful file delete -a always,exit -F arch=b32 -S unlink,unlink...Rule Medium Severity -
Configure auditing of successful file deletions
Ensure that successful attempts to delete a file are audited. The following rules configure audit as described above: <pre>## Successful file delete -a always,exit -F arch=b32 -S unlink,unlinkat,r...Rule Medium Severity -
Configure immutable Audit login UIDs
Configure kernel to prevent modification of login UIDs once they are set. Changing login UIDs while this configuration is enforced requires special capabilities which are not available to unprivile...Rule Medium Severity -
Configure auditing of unsuccessful file modifications
Ensure that unsuccessful attempts to modify a file are audited. The following rules configure audit as described above: <pre>## Unsuccessful file modifications (open for write or truncate) -a alwa...Rule Medium Severity -
Configure auditing of successful file modifications
Ensure that successful attempts to modify a file are audited. The following rules configure audit as described above: <pre>## Successful file modifications (open for write or truncate) -a always,e...Rule Medium Severity -
Configure auditing of unsuccessful ownership changes
Ensure that unsuccessful attempts to change an ownership of files or directories are audited. The following rules configure audit as described above: <pre>## Unsuccessful ownership change -a alway...Rule Medium Severity -
Configure auditing of successful ownership changes
Ensure that successful attempts to change an ownership of files or directories are audited. The following rules configure audit as described above: <pre>## Successful ownership change -a always,ex...Rule Medium Severity -
Configure auditing of unsuccessful permission changes
Ensure that unsuccessful attempts to change file or directory permissions are audited. The following rules configure audit as described above: <pre>## Unsuccessful permission change -a always,exit...Rule Medium Severity -
Configure auditing of successful permission changes
Ensure that successful attempts to modify permissions of files or directories are audited. The following rules configure audit as described above: <pre>## Successful permission change -a always,ex...Rule Medium Severity -
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 disk. The <code>auditd</code> service can be ena...Rule Medium Severity -
Enable Auditing for Processes Which Start Prior to the Audit Daemon
To ensure all processes can be audited, even those which start prior to the audit daemon, add the argument <code>audit=1</code> to the default GRUB 2 command line for the Linux operating system. To...Rule Low 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 for comprehensive auditing, but a full description...Group -
Record Events that Modify User/Group Information via open syscall - /etc/group
The audit system should collect write events to /etc/group file for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rule...Rule Medium Severity -
Record Events that Modify User/Group Information via openat syscall - /etc/gshadow
The audit system should collect write events to /etc/gshadow file for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit ru...Rule Medium Severity -
Record Events that Modify User/Group Information via open_by_handle_at syscall - /etc/passwd
The audit system should collect write events to /etc/passwd file for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rul...Rule Medium Severity -
Record Events that Modify User/Group Information via open_by_handle_at syscall - /etc/shadow
The audit system should collect write events to /etc/shadow file for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rul...Rule Medium Severity -
Ensure auditd Collects Information on Exporting to Media (successful)
At a minimum, the audit system should collect media exportation events for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read aud...Rule Medium Severity -
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), add the following lines to a file with suffix <co...Rule Medium Severity -
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), add the following line to a file with suffix <cod...Rule Medium Severity -
Record Events When Executables Are Run As Another User
Verify the system generates an audit record when actions are run as another user. sudo provides users with temporary elevated privileges to perform operations, either as the superuser or another us...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 the <code>augenrules</code> program to read audit ...Rule Medium Severity -
Record Events that Modify User/Group Information - /etc/gshadow
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default), add the following lines to a file with suffix <co...Rule Medium Severity -
Record Attempts to perform maintenance activities
The Red Hat Enterprise Linux 8 operating system must generate audit records for privileged activities, nonlocal maintenance, diagnostic sessions and other system-level access. Verify the operating...Rule Medium Severity -
System Audit Directories Must Be Owned By Root
All audit directories must be owned by root user. By default, the path for audit log is <pre>/var/log/audit/</pre>. To properly set the owner of <code>/var/log/audit</code>, run the command: <pre>...Rule Medium Severity -
Audit Configuration Files Must Be Owned By Group root
All audit configuration files must be owned by group root.chown :root /etc/audit/audit*.{rules,conf} /etc/audit/rules.d/*Rule Medium Severity -
Audit Configuration Files Must Be Owned By Root
All audit configuration files must be owned by root user. To properly set the owner of <code>/etc/audit/</code>, run the command: <pre>$ sudo chown root /etc/audit/ </pre> To properly set the own...Rule Medium Severity -
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 use the <code>augenrules</code> program to read audi...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 use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - fremovexattr
At a minimum, the audit system should collect file permission changes for all users and root. <br> <br> If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> pr...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - lremovexattr
At a minimum, the audit system should collect file permission changes for all users and root. <br> <br> If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> pr...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - lsetxattr
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 use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - setxattr
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 use the <code>augenrules</code> program to read audi...Rule Medium Severity -
Record Events that Modify the System's Discretionary Access Controls - umount2
At a minimum, the audit system should collect file system umount2 changes. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daem...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>auditd</code> daemon is configured to use the <code>aug...Rule Medium Severity -
Ensure auditd Collects File Deletion Events by User
At a minimum the audit system should collect file deletion events for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit ru...Rule Medium Severity -
Ensure auditd Collects File Deletion Events by User - unlinkat
At a minimum, the audit system should collect file deletion events for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit r...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 present even on a 64 bit system. These commands identify...Group -
Record Successful Permission Changes to Files - fchmodat
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 use the <code>augenrules</code> program to read audi...Rule Medium Severity
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