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Guide to the Secure Configuration of Red Hat Enterprise Linux 7

Rules, Groups, and Values defined within the XCCDF Benchmark

  • System Settings

    Contains rules that check correct system settings.
    Group
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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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  • Package "prelink" Must not be Installed

    The prelink package can be removed with the following command: 
     $ sudo yum erase prelink
    Rule Medium Severity
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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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  • net.ipv4.conf.default.rp_filter

    Enables source route verification
    Value
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  • net.ipv6.conf.all.accept_ra_pinfo

    Accept prefix information in router advertisements?
    Value
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  • net.ipv6.conf.all.accept_ra_rtr_pref

    Accept router preference in router advertisements?
    Value
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  • net.ipv6.conf.all.accept_ra

    Accept all router advertisements?
    Value
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  • net.ipv6.conf.all.accept_redirects

    Toggle ICMP Redirect Acceptance
    Value
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  • Install AIDE

    The aide package can be installed with the following command: 
    $ sudo yum install aide
    Rule Medium 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 and Correct File Permissions with RPM

    The RPM package management system can check file access permissions of installed software packages, including many that are important to system security. Verify that the file permissions of system ...
    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...
    Group
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  • Install Intrusion Detection Software

    The base Red Hat Enterprise Linux 7 platform already includes a sophisticated auditing system that can detect intruder activity, as well as SELinux, which provides host-based intrusion prevention c...
    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.
    Group
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  • Build and Test AIDE Database

    Run the following command to generate a new database: <pre>$ sudo /usr/sbin/aide --init</pre> By default, the database will be written to the file <code>/var/lib/aide/aide.db.new.gz</code>. Sto...
    Rule Medium Severity
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  • Configure Periodic Execution of AIDE

    At a minimum, AIDE should be configured to run a weekly scan. To implement a daily execution of AIDE at 4:05am using cron, add the following line to <code>/etc/crontab</code>: <pre>05 4 * * * root ...
    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 Use FIPS 140-2 for Validating Hashes

    By default, the <code>sha512</code> option is added to the <code>NORMAL</code> ruleset in AIDE. If using a custom ruleset or the <code>sha512</code> option is missing, add <code>sha512</code> to th...
    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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  • Configure AIDE to Verify Extended Attributes

    By default, the <code>xattrs</code> option is added to the <code>FIPSR</code> ruleset in AIDE. If using a custom ruleset or the <code>xattrs</code> option is missing, add <code>xattrs</code> to the...
    Rule Low Severity
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  • The age of McAfee defintion file before requiring updating

    Specify the amount of time (in seconds) before McAfee definition files need to be updated.
    Value
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  • Enable nails Service

    The <code>nails</code> service is used to run McAfee VirusScan Enterprise for Linux and McAfee Host-based Security System (HBSS) services. The <code>nails</code> service can be enabled with the fo...
    Rule Medium 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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  • Install the dracut-fips-aesni Package

    To enable FIPS on system that support the Advanced Encryption Standard (AES) or New Instructions (AES-NI) engine, the system requires that the <code>dracut-fips-aesni</code> package be installed. T...
    Rule Medium Severity
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  • Install the dracut-fips Package

    To enable FIPS, the system requires that the <code>dracut-fips</code> package be installed. The <code>dracut-fips</code> package can be installed with the following command: <pre> $ sudo yum instal...
    Rule Medium Severity
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  • Ensure '/etc/system-fips' exists

    On a system where FIPS mode is enabled, /etc/system-fips must exist. To enable FIPS mode, run the following command: 
    fips-mode-setup --enable
    Rule High Severity
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  • Enable FIPS Mode in GRUB2

    To ensure FIPS mode is enabled, install package <code>dracut-fips</code>, and rebuild <code>initramfs</code> by running the following commands: <pre> $ sudo yum install dracut-fips dracut -f</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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  • SSH client RekeyLimit - size

    Specify the size component of the rekey limit. This limit signifies amount of data. After this amount of data is transferred through the connection, the session key is renegotiated. The number is f...
    Value
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  • SSH client RekeyLimit - time

    Specify the time component of the rekey limit. The session key is renegotiated after the defined amount of time passes. The number is followed by units such as H or M for hours or minutes. Note tha...
    Value
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  • The system-provided crypto policies

    Specify the crypto policy for the system.
    Value
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  • Install McAfee Virus Scanning Software

    Install McAfee VirusScan Enterprise for Linux antivirus software which is provided for DoD systems and uses signatures to search for the presence of viruses on the filesystem.
    Rule High Severity
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  • Install the McAfee Runtime Libraries and Linux Agent

    Install the McAfee Runtime Libraries (MFErt) and Linux Agent (MFEcma).
    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. Red Hat Enterprise Linux is supported by Red Hat...
    Rule High Severity
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  • The Installed Operating System Is Vendor Supported

    The installed operating system must be maintained by a vendor. Red Hat Enterprise Linux is supported by Red Hat, Inc. As the Red Hat Enterprise Linux vendor, Red Hat, Inc. is responsible for provi...
    Rule High 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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  • 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 Virus Scanning Software

    Virus scanning software can be used to protect a system from penetration from computer viruses and to limit their spread through intermediate systems. The virus scanning software should be configu...
    Rule High Severity
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  • Uninstall abrt-plugin-sosreport Package

    The abrt-plugin-sosreport package can be removed with the following command: 
    $ sudo yum erase abrt-plugin-sosreport
    Rule Low Severity
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  • Virus Scanning Software Definitions Are Updated

    Ensure virus definition files are no older than 7 days or their last release.
    Rule Medium Severity
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  • McAfee Endpoint Security for Linux (ENSL)

    McAfee Endpoint Security for Linux (ENSL) is a suite of software applications used to monitor, detect, and defend computer networks and systems.
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