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Guide to the Secure Configuration of SUSE Linux Enterprise 12

Rules, Groups, and Values defined within the XCCDF Benchmark

  • System Settings

    Contains rules that check correct system settings.
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  • Installing and Maintaining Software

    The following sections contain information on security-relevant choices during the initial operating system installation process and the setup of software updates.
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  • Prefer to use a 64-bit Operating System when supported

    Prefer installation of 64-bit operating systems when the CPU supports it.
    Rule Medium Severity
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  • System and Software Integrity

    System and software integrity can be gained by installing antivirus, increasing system encryption strength with FIPS, verifying installed software, enabling SELinux, installing an Intrusion Prevent...
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  • Disable Prelinking

    The prelinking feature changes binaries in an attempt to decrease their startup time. In order to disable it, change or add the following line inside the file <code>/etc/sysconfig/prelink</code>: <...
    Rule Medium Severity
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  • minclass

    Minimum number of categories of characters that must exist in a password
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  • minlen

    Minimum number of characters in password
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  • ocredit

    Minimum number of other (special characters) in password
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  • retry

    Number of retry attempts before erroring out
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  • ucredit

    Minimum number of upper case in password
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  • net.ipv4.tcp_rfc1337

    Enable to enable TCP behavior conformant with RFC 1337
    Value
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  • net.ipv4.tcp_syncookies

    Enable to turn on TCP SYN Cookie Protection
    Value
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  • Chat/Messaging Services

    The talk software makes it possible for users to send and receive messages across systems through a terminal session.
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  • Action for auditd to take when disk space just starts to run low

    The setting for space_left_action in /etc/audit/auditd.conf
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  • Set Password Hashing Algorithm

    The system's default algorithm for storing password hashes in /etc/shadow is SHA-512. This can be configured in several locations.
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  • MotD Banner Verbiage

    Enter an appropriate login banner for your organization. Please note that new lines must be expressed by the '\n' character and special characters like parentheses and quotation marks must be escap...
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  • Remote Login Banner Verbiage

    Enter an appropriate login banner for your organization. Please note that new lines must be expressed by the '\n' character and special characters like parentheses and quotation marks must be escap...
    Value
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  • tally2

    Number of failed login attempts
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  • The Installed Operating System Is Vendor Supported

    The installed operating system must be maintained by a vendor. SUSE Linux Enterprise is supported by SUSE. As the SUSE Linux Enterprise vendor, SUSE is responsible for providing security patches.
    Rule High Severity
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  • Software Integrity Checking

    Both the AIDE (Advanced Intrusion Detection Environment) software and the RPM package management system provide mechanisms for verifying the integrity of installed software. AIDE uses snapshots of ...
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  • Integrity Scan Notification Email Address

    Specify the email address for designated personnel if baseline configurations are changed in an unauthorized manner.
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  • Verify Integrity with RPM

    The RPM package management system includes the ability to verify the integrity of installed packages by comparing the installed files with information about the files taken from the package metadat...
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  • Verify and Correct Ownership with RPM

    The RPM package management system can check file ownership permissions of installed software packages, including many that are important to system security. After locating a file with incorrect per...
    Rule High Severity
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  • Verify Integrity with AIDE

    AIDE conducts integrity checks by comparing information about files with previously-gathered information. Ideally, the AIDE database is created immediately after initial system configuration, and t...
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  • Install AIDE

    The aide package can be installed with the following command: 
    $ sudo zypper install aide
    Rule Medium Severity
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  • Endpoint Protection Software

    Endpoint protection security software that is not provided or supported by Red Hat can be installed to provide complementary or duplicative security capabilities to those provided by the base pla...
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  • Build and Test AIDE Database

    Run the following command to generate a new database: <pre>$ sudo /usr/bin/aide --init</pre> By default, the database will be written to the file <code>/var/lib/aide/aide.db.new</code>. Storing...
    Rule Medium Severity
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  • Configure AIDE to Verify the Audit Tools

    The operating system file integrity tool must be configured to protect the integrity of the audit tools.
    Rule Medium Severity
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  • Configure Notification of Post-AIDE Scan Details

    AIDE should notify appropriate personnel of the details of a scan after the scan has been run. If AIDE has already been configured for periodic execution in <code>/etc/crontab</code>, append the fo...
    Rule Medium Severity
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  • Configure AIDE to Verify Access Control Lists (ACLs)

    By default, the <code>acl</code> option is added to the <code>FIPSR</code> ruleset in AIDE. If using a custom ruleset or the <code>acl</code> option is missing, add <code>acl</code> to the appropri...
    Rule Low Severity
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  • Federal Information Processing Standard (FIPS)

    The Federal Information Processing Standard (FIPS) is a computer security standard which is developed by the U.S. Government and industry working groups to validate the quality of cryptographic mod...
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  • Verify '/proc/sys/crypto/fips_enabled' exists

    On a system where FIPS 140-2 mode is enabled, <code>/proc/sys/crypto/fips_enabled</code> must exist. To verify FIPS mode, run the following command: <pre>cat /proc/sys/crypto/fips_enabled</pre> ...
    Rule High Severity
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  • System Cryptographic Policies

    Linux has the capability to centrally configure cryptographic polices. The command <code>update-crypto-policies</code> is used to set the policy applicable for the various cryptographic back-ends, ...
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  • Ensure /home Located On Separate Partition

    If user home directories will be stored locally, create a separate partition for <code>/home</code> at installation time (or migrate it later using LVM). If <code>/home</code> will be mounted from ...
    Rule Low Severity
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  • Ensure /opt Located On Separate Partition

    It is recommended that the /opt directory resides on a separate partition.
    Rule Medium Severity
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  • Configure OpenSSL library to use System Crypto Policy

    Crypto Policies provide a centralized control over crypto algorithms usage of many packages. OpenSSL is supported by crypto policy, but the OpenSSL configuration may be set up to ignore it. To chec...
    Rule Medium Severity
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  • Configure SSH to use System Crypto Policy

    Crypto Policies provide a centralized control over crypto algorithms usage of many packages. SSH is supported by crypto policy, but the SSH configuration may be set up to ignore it. To check that C...
    Rule Medium Severity
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  • Harden SSH client Crypto Policy

    Crypto Policies are means of enforcing certain cryptographic settings for selected applications including OpenSSH client. To override the system wide crypto policy for Openssh client, place a file ...
    Rule Medium Severity
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  • Harden SSHD Crypto Policy

    Crypto Policies are means of enforcing certain cryptographic settings for selected applications including OpenSSH server. The SSHD service is by default configured to modify its configuration based...
    Rule Medium Severity
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  • Operating System Vendor Support and Certification

    The assurance of a vendor to provide operating system support and maintenance for their product is an important criterion to ensure product stability and security over the life of the product. A ce...
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  • The Installed Operating System Is FIPS 140-2 Certified

    To enable processing of sensitive information the operating system must provide certified cryptographic modules compliant with FIPS 140-2 standard. SUSE Enterprise Linux is supported by SUSE Softw...
    Rule High Severity
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  • Configure Backups of User Data

    The operating system must conduct backups of user data contained in the operating system. The operating system provides utilities for automating backups of user data. Commercial and open-source pro...
    Rule Medium Severity
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  • Install Intrusion Detection Software

    The base SUSE Linux Enterprise 12 platform already includes a sophisticated auditing system that can detect intruder activity, as well as SELinux, which provides host-based intrusion prevention cap...
    Rule High Severity
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  • McAfee Endpoint Security Software

    In DoD environments, McAfee Host-based Security System (HBSS) and VirusScan Enterprise for Linux (VSEL) is required to be installed on all systems.
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  • McAfee Host-Based Intrusion Detection Software (HBSS)

    McAfee Host-based Security System (HBSS) is a suite of software applications used to monitor, detect, and defend computer networks and systems.
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  • Install the Host Intrusion Prevention System (HIPS) Module

    Install the McAfee Host Intrusion Prevention System (HIPS) Module if it is absolutely necessary. If SELinux is enabled, do not install or enable this module.
    Rule Medium Severity
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  • Encrypt Partitions

    SUSE Linux Enterprise 12 natively supports partition encryption through the Linux Unified Key Setup-on-disk-format (LUKS) technology. The easiest way to encrypt a partition is during installation t...
    Rule High Severity
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  • Ensure /boot Located On Separate Partition

    It is recommended that the <code>/boot</code> directory resides on a separate partition. This makes it easier to apply restrictions e.g. through the <code>noexec</code> mount option. Eventually, th...
    Rule Medium Severity
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  • Account Lockouts Must Be Logged

    PAM faillock locks an account due to excessive password failures, this event must be logged.
    Rule Medium Severity
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  • Ensure /srv Located On Separate Partition

    If a file server (FTP, TFTP...) is hosted locally, create a separate partition for <code>/srv</code> at installation time (or migrate it later using LVM). If <code>/srv</code> will be mounted from ...
    Rule Unknown Severity
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