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Guide to the Secure Configuration of Ubuntu 16.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • 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
    Show

  • Verify Root Has A Primary GID 0

    The root user should have a primary group of 0.
    Rule High Severity
    Show

  • Direct root Logins Not Allowed

    To further limit access to the <code>root</code> account, administrators can disable root logins at the console by editing the <code>/etc/securetty...
    Rule Medium Severity
    Show

  • Restrict Serial Port Root Logins

    To restrict root logins on serial ports, ensure lines of this form do not appear in /etc/securetty: 
    ttyS0
ttyS1
    Rule Medium Severity
    Show

  • container_connect_any SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • Ensure the Logon Failure Delay is Set Correctly in login.defs

    To ensure the logon failure delay controlled by <code>/etc/login.defs</code> is set properly, add or correct the <code>FAIL_DELAY</code> setting in...
    Rule Medium Severity
    Show

  • Limit the Number of Concurrent Login Sessions Allowed Per User

    Limiting the number of allowed users and sessions per user can limit risks related to Denial of Service attacks. This addresses concurrent sessions...
    Rule Low Severity
    Show

  • Configure Polyinstantiation of /tmp Directories

    To configure polyinstantiated /tmp directories, first create the parent directories which will hold the polyinstantiation child directories. Use th...
    Rule Low Severity
    Show

  • Configure Polyinstantiation of /var/tmp Directories

    To configure polyinstantiated /tmp directories, first create the parent directories which will hold the polyinstantiation child directories. Use th...
    Rule Low Severity
    Show

  • Ensure that User Home Directories are not Group-Writable or World-Readable

    For each human user of the system, view the permissions of the user's home directory: <pre># ls -ld /home/<i>USER</i></pre> Ensure that the directo...
    Rule Medium Severity
    Show

  • Ensure that No Dangerous Directories Exist in Root's Path

    The active path of the root account can be obtained by starting a new root shell and running: <pre># echo $PATH</pre> This will produce a colon-sep...
    Group
    Show

  • Ensure that Root's Path Does Not Include World or Group-Writable Directories

    For each element in root's path, run: 
    # ls -ld DIR
    and ensure that write permissions are disabled for group and other.
    Rule Medium Severity
    Show

  • Ensure that Root's Path Does Not Include Relative Paths or Null Directories

    Ensure that none of the directories in root's path is equal to a single <code>.</code> character, or that it contains any instances that lead to re...
    Rule Unknown Severity
    Show

  • Ensure that Users Have Sensible Umask Values

    The umask setting controls the default permissions for the creation of new files. With a default <code>umask</code> setting of 077, files and direc...
    Group
    Show

  • Sensible umask

    Enter default user umask
    Value
    Show

  • Ensure the Default Umask is Set Correctly in login.defs

    To ensure the default umask controlled by <code>/etc/login.defs</code> is set properly, add or correct the <code>UMASK</code> setting in <code>/etc...
    Rule Medium Severity
    Show

  • Ensure the Default Umask is Set Correctly in /etc/profile

    To ensure the default umask controlled by <code>/etc/profile</code> is set properly, add or correct the <code>umask</code> setting in <code>/etc/pr...
    Rule Medium Severity
    Show

  • 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
    Show

  • Ensure the audit Subsystem is Installed

    The audit package should be installed.
    Rule Medium Severity
    Show

  • 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
    Show

  • 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
    Show

  • Audit failure mode

    This variable is the setting for the -f option in Audit configuration which sets the failure mode of audit. This option lets you determine how you ...
    Value
    Show

  • Make the auditd Configuration Immutable

    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
    Show

  • Action for auditd to take when disk errors

    'The setting for disk_error_action in /etc/audit/auditd.conf, if multiple values are allowed write them separated by pipes as in "syslog|single|hal...
    Value
    Show

  • Record Events that Modify the System's Mandatory Access Controls

    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
    Show

  • Record Events that Modify the System's Mandatory Access Controls in usr/share

    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
    Show

  • 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 u...
    Rule Medium Severity
    Show

  • 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
    Show

  • 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
    Show

  • 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
    Show

  • Action for auditd to take when disk is full

    'The setting for disk_full_action in /etc/audit/auditd.conf, if multiple values are allowed write them separated by pipes as in "syslog|single|halt...
    Value
    Show

  • Auditd priority for flushing data to disk

    The setting for flush in /etc/audit/auditd.conf
    Value
    Show

  • Number of Record to Retain Before Flushing to Disk

    The setting for freq in /etc/audit/auditd.conf
    Value
    Show

  • Maximum audit log file size for auditd

    The setting for max_log_file in /etc/audit/auditd.conf
    Value
    Show

  • 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
    Show

  • System Audit Logs Must Have Mode 0750 or Less Permissive

    If <code>log_group</code> in <code>/etc/audit/auditd.conf</code> is set to a group other than the <code>root</code> group account, change the mode...
    Rule Medium Severity
    Show

  • 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
    Show

  • 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 chow...
    Rule Medium Severity
    Show

  • System Audit Logs Must Be Owned By Root

    All audit logs must be owned by root user and group. By default, the path for audit log is <pre>/var/log/audit/</pre>. To properly set the owner o...
    Rule Medium Severity
    Show

  • Audit Configuration Files Permissions are 640 or More Restrictive

    All audit configuration files permissions must be 640 or more restrictive. 
    chmod 0640 /etc/audit/audit*.{rules,conf} /etc/audit/rules.d/*
    Rule Medium Severity
    Show

  • 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
    Show

  • 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
    Show

  • 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
    Show

  • Record Events that Modify the System's Discretionary Access Controls - fchmod

    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
    Show

  • Record Events that Modify the System's Discretionary Access Controls - 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 us...
    Rule Medium Severity
    Show

  • Record Events that Modify the System's Discretionary Access Controls - fchown

    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
    Show

  • Record Events that Modify the System's Discretionary Access Controls - fchownat

    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
    Show

  • 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 configu...
    Rule Medium Severity
    Show

  • Record Events that Modify the System's Discretionary Access Controls - fsetxattr

    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
    Show

  • Record Events that Modify the System's Discretionary Access Controls - lchown

    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
    Show

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