ANSSI-BP-028 (enhanced)
Rules and Groups employed by this XCCDF Profile
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Enable SLUB/SLAB allocator poisoning
To enable poisoning of SLUB/SLAB objects, add the argument <code>slub_debug=<xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_slub_debug_options" use="legacy"></xccdf-1.2:sub> <...Rule Medium Severity -
Verify Group Who Owns /etc/selinux Directory
To properly set the group owner of/etc/selinux
, run the command:$ sudo chgrp root /etc/selinux
Rule Medium Severity -
Verify User Who Owns /etc/selinux Directory
To properly set the owner of/etc/selinux
, run the command:$ sudo chown root /etc/selinux
Rule Medium Severity -
Verify Permissions On /etc/selinux Directory
To properly set the permissions of/etc/selinux
, run the command:$ sudo chmod 0755 /etc/selinux
Rule Medium Severity -
Verify Group Who Owns /etc/sestatus.conf File
To properly set the group owner of/etc/sestatus.conf
, run the command:$ sudo chgrp root /etc/sestatus.conf
Rule Medium Severity -
Verify User Who Owns /etc/sestatus.conf File
To properly set the owner of/etc/sestatus.conf
, run the command:$ sudo chown root /etc/sestatus.conf
Rule Medium Severity -
Verify Permissions On /etc/sestatus.conf File
To properly set the permissions of/etc/sestatus.conf
, run the command:$ sudo chmod 0644 /etc/sestatus.conf
Rule Medium Severity -
Configure the polyinstantiation_enabled SELinux Boolean
By default, the SELinux boolean <code>polyinstantiation_enabled</code> is disabled. This setting should be configured to <xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_polyinstantiati...Rule Medium Severity -
Uninstall DHCP Server Package
If the system does not need to act as a DHCP server, the dhcp package can be uninstalled. The <code>dhcp</code> package can be removed with the following command: <pre> $ apt-get remove dhcp</pre>...Rule Medium Severity -
Uninstall Sendmail Package
Sendmail is not the default mail transfer agent and is not installed by default. The <code>sendmail</code> package can be removed with the following command: <pre> $ apt-get remove sendmail</pre> ...Rule Medium Severity -
Disable Postfix Network Listening
Edit the file <code>/etc/postfix/main.cf</code> to ensure that only the following <code>inet_interfaces</code> line appears: <pre>inet_interfaces = <xccdf-1.2:sub idref="xccdf_org.ssgproject.conten...Rule Medium Severity -
Enable the NTP Daemon
Run the following command to determine the current status of the <code>chronyd</code> service: <pre>$ sudo systemctl is-active chronyd</pre> If the service is running, it should return the follow...Rule Medium Severity -
Chrony Configure Pool and Server
<code>Chrony</code> is a daemon which implements the Network Time Protocol (NTP). It is designed to synchronize system clocks across a variety of systems and use a source that is highly accurate. M...Rule Medium Severity -
Verify Group Who Owns /etc/chrony.keys File
To properly set the group owner of/etc/chrony.keys
, run the command:$ sudo chgrp root /etc/chrony.keys
Rule Medium Severity -
Verify User Who Owns /etc/chrony.keys File
To properly set the owner of/etc/chrony.keys
, run the command:$ sudo chown root /etc/chrony.keys
Rule Medium Severity -
Verify Permissions On /etc/chrony.keys File
To properly set the permissions of/etc/chrony.keys
, run the command:$ sudo chmod 0600 /etc/chrony.keys
Rule Medium Severity -
Uninstall xinetd Package
Thexinetd
package can be removed with the following command:$ apt-get remove xinetd
Rule Low Severity -
Remove NIS Client
The Network Information Service (NIS), formerly known as Yellow Pages, is a client-server directory service protocol used to distribute system configuration files. The NIS client (<code>ypbind</cod...Rule Unknown Severity -
Uninstall ypserv Package
Theypserv
package can be removed with the following command:$ apt-get remove ypserv
Rule High Severity -
Uninstall rsh-server Package
Thersh-server
package can be removed with the following command:$ apt-get remove rsh-server
Rule High Severity -
Uninstall rsh Package
Thersh
package contains the client commands for the rsh servicesRule Unknown Severity -
Uninstall talk-server Package
Thetalk-server
package can be removed with the following command:$ apt-get remove talk-server
Rule Medium Severity -
Uninstall talk Package
The <code>talk</code> package contains the client program for the Internet talk protocol, which allows the user to chat with other users on different systems. Talk is a communication program which ...Rule Medium Severity -
Uninstall telnet-server Package
Thetelnet-server
package can be removed with the following command:$ apt-get remove telnet-server
Rule High Severity -
Remove telnet Clients
The telnet client allows users to start connections to other systems via the telnet protocol.Rule Low Severity -
Uninstall tftp-server Package
Thetftp-server
package can be removed with the following command:$ apt-get remove tftp-server
Rule High Severity -
Remove tftp Daemon
Trivial File Transfer Protocol (TFTP) is a simple file transfer protocol, typically used to automatically transfer configuration or boot files between systems. TFTP does not support authentication ...Rule Low Severity -
Verify Group Who Owns SSH Server config file
To properly set the group owner of/etc/ssh/sshd_config
, run the command:$ sudo chgrp root /etc/ssh/sshd_config
Rule Medium Severity -
Verify Owner on SSH Server config file
To properly set the owner of/etc/ssh/sshd_config
, run the command:$ sudo chown root /etc/ssh/sshd_config
Rule Medium Severity -
Verify Permissions on SSH Server config file
To properly set the permissions of/etc/ssh/sshd_config
, run the command:$ sudo chmod 0600 /etc/ssh/sshd_config
Rule Medium Severity -
Record Events that Modify User/Group Information - /etc/group
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 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 Events that Modify User/Group Information - /etc/security/opasswd
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 User/Group Information - /etc/passwd
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 User/Group Information - /etc/shadow
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 Debian 12 operating system must generate audit records for privileged activities, nonlocal maintenance, diagnostic sessions and other system-level access. Verify the operating system audits ac...Rule Medium Severity -
Ensure auditd Collects Information on the Use of Privileged Commands - insmod
At a minimum, the audit system should collect the execution of privileged commands for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program...Rule Medium Severity -
Ensure auditd Collects Information on the Use of Privileged Commands - kmod
At a minimum, the audit system should collect the execution of privileged commands for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program...Rule Medium Severity -
Ensure auditd Collects Information on the Use of Privileged Commands - modprobe
At a minimum, the audit system should collect the execution of privileged commands for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program...Rule Medium Severity -
Ensure auditd Collects Information on the Use of Privileged Commands - rmmod
At a minimum, the audit system should collect the execution of privileged commands for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program...Rule Medium Severity -
Ensure auditd Collects Information on the Use of Privileged Commands - sudo
At a minimum, the audit system should collect the execution of privileged commands for all users and root. If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program...Rule Medium Severity
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