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Guide to the Secure Configuration of SUSE Linux Enterprise 15

Rules, Groups, and Values defined within the XCCDF Benchmark

  • minlen

    Minimum number of characters in password
    Value
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  • ocredit

    Minimum number of other (special characters) in password
    Value
    Show

  • retry

    Number of retry attempts before erroring out
    Value
    Show

  • ucredit

    Minimum number of upper case in password
    Value
    Show

  • Ensure PAM Enforces Password Requirements - Authentication Retry Prompts Permitted Per-Session

    To configure the number of retry prompts that are permitted per-session: Edit the <code>pam_pwquality.so</code> statement in <code>/etc/pam.d/system-auth</code> to show <code>retry=<xccdf-1.2:s...
    Rule Medium Severity
    Show

  • 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.
    Group
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  • Set Password Hashing Algorithm in /etc/libuser.conf

    In <code>/etc/libuser.conf</code>, add or correct the following line in its <code>[defaults]</code> section to ensure the system will use the <xccdf-1.2:sub idref="xccdf_org.ssgproject.content_valu...
    Rule Medium Severity
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  • Set Password Hashing Rounds in /etc/login.defs

    In <code>/etc/login.defs</code>, ensure <code>SHA_CRYPT_MIN_ROUNDS</code> and <code>SHA_CRYPT_MAX_ROUNDS</code> has the minimum value of <code>5000</code>. For example: <pre>SHA_CRYPT_MIN_ROUNDS 50...
    Rule Medium Severity
    Show

  • Protect Physical Console Access

    It is impossible to fully protect a system from an attacker with physical access, so securing the space in which the system is located should be considered a necessary step. However, there are some...
    Group
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  • Login timeout for idle sessions

    Specify duration of allowed idle time.
    Value
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  • Disable debug-shell SystemD Service

    SystemD's <code>debug-shell</code> service is intended to diagnose SystemD related boot issues with various <code>systemctl</code> commands. Once enabled and following a system reboot, the root she...
    Rule Medium Severity
    Show

  • Disable Ctrl-Alt-Del Burst Action

    By default, <code>SystemD</code> will reboot the system if the <code>Ctrl-Alt-Del</code> key sequence is pressed Ctrl-Alt-Delete more than 7 times in 2 seconds. <br> <br> To configure the s...
    Rule High Severity
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  • Disable Ctrl-Alt-Del Reboot Activation

    By default, <code>SystemD</code> will reboot the system if the <code>Ctrl-Alt-Del</code> key sequence is pressed. <br> <br> To configure the system to ignore the <code>Ctrl-Alt-Del</code> k...
    Rule High Severity
    Show

  • Require Authentication for Emergency Systemd Target

    Emergency mode is intended as a system recovery method, providing a single user root access to the system during a failed boot sequence. <br> <br> By default, Emergency mode is protected by...
    Rule Medium Severity
    Show

  • Require Authentication for Single User Mode

    Single-user mode is intended as a system recovery method, providing a single user root access to the system by providing a boot option at startup. <br> <br> By default, single-user mode is ...
    Rule Medium Severity
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  • Configure Screen Locking

    When a user must temporarily leave an account logged-in, screen locking should be employed to prevent passersby from abusing the account. User education and training is particularly important for s...
    Group
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  • Configure Console Screen Locking

    A console screen locking mechanism is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not logout because of th...
    Group
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  • Check that vlock is installed to allow session locking

    The SUSE Linux Enterprise 15 operating system must have vlock installed to allow for session locking. The <code>kbd</code> package can be installed with the following command: <pre> $ sudo zypper...
    Rule Medium Severity
    Show

  • Hardware Tokens for Authentication

    The use of hardware tokens such as smart cards for system login provides stronger, two-factor authentication than using a username and password. In Red Hat Enterprise Linux servers and workstation...
    Group
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  • Configure Smart Card Certificate Status Checking

    Configure the operating system to do certificate status checking for PKI authentication. Modify all of the <code>cert_policy</code> lines in <code>/etc/pam_pkcs11/pam_pkcs11.conf</code> to include ...
    Rule Medium Severity
    Show

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