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Guide to the Secure Configuration of Oracle Linux 9

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Enable Yama support

    This enables support for LSM module Yama, which extends DAC support with additional system-wide security settings beyond regular Linux discretionary access controls. The module will limit the use o...
    Rule Medium Severity
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  • Enable SLUB debugging support

    SLUB has extensive debug support features and this allows the allocator validation checking to be enabled. The configuration that was used to build kernel is available at <code>/boot/config-*</cod...
    Rule Medium Severity
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  • Enable TCP/IP syncookie support

    Normal TCP/IP networking is open to an attack known as SYN flooding. It is denial-of-service attack that prevents legitimate remote users from being able to connect to your computer during an ongoi...
    Rule Medium Severity
    Show

  • Unmap kernel when running in userspace (aka KAISER)

    Speculation attacks against some high-performance processors can be used to bypass MMU permission checks and leak kernel data to userspace. This can be defended against by unmapping the kernel when...
    Rule Medium Severity
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  • Disable x86 vsyscall emulation

    Disabling it is roughly equivalent to booting with vsyscall=none, except that it will also disable the helpful warning if a program tries to use a vsyscall. With this option set to N, offending pro...
    Rule Low Severity
    Show

  • Kernel GCC plugin configuration

    Contains rules that check the configuration of GCC plugins used by the compiler
    Group
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  • Ensure rsyslog-gnutls is installed

    TLS protocol support for rsyslog is installed. The rsyslog-gnutls package can be installed with the following command: 
    $ sudo yum install rsyslog-gnutls
    Rule Medium Severity
    Show

  • Ensure rsyslog is Installed

    Rsyslog is installed by default. The rsyslog package can be installed with the following command: 
     $ sudo yum install rsyslog
    Rule Medium Severity
    Show

  • Enable rsyslog Service

    The <code>rsyslog</code> service provides syslog-style logging by default on Oracle Linux 9. The <code>rsyslog</code> service can be enabled with the following command: <pre>$ sudo systemctl enabl...
    Rule Medium Severity
    Show

  • Ensure cron Is Logging To Rsyslog

    Cron logging must be implemented to spot intrusions or trace cron job status. If <code>cron</code> is not logging to <code>rsyslog</code>, it can be implemented by adding the following to the <i>RU...
    Rule Medium Severity
    Show

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