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Guide to the Secure Configuration of Red Hat Enterprise Linux 7

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Randomize the address of the kernel image (KASLR)

    In support of Kernel Address Space Layout Randomization (KASLR), this randomizes the physical address at which the kernel image is decompressed and...
    Rule Medium Severity
    Show

  • Randomize the kernel memory sections

    Randomizes the base virtual address of kernel memory sections (physical memory mapping, vmalloc & vmemmap). This configuration is available fro...
    Rule Medium Severity
    Show

  • Perform full reference count validation

    Enabling this switches the refcounting infrastructure from a fast unchecked atomic_t implementation to a fully state checked implementation, which ...
    Rule Medium Severity
    Show

  • Avoid speculative indirect branches in kernel

    Compile kernel with the retpoline compiler options to guard against kernel-to-user data leaks by avoiding speculative indirect branches. Requires a...
    Rule Medium Severity
    Show

  • Enable seccomp to safely compute untrusted bytecode

    This kernel feature is useful for number crunching applications that may need to compute untrusted bytecode during their execution. By using pipes ...
    Rule Medium Severity
    Show

  • Ensure journald is configured to write log files to persistent disk

    The journald system may store log files in volatile memory or locally on disk. If the logs are only stored in volatile memory they will we lost upo...
    Rule Medium Severity
    Show

  • Enable use of Berkeley Packet Filter with seccomp

    Enable tasks to build secure computing environments defined in terms of Berkeley Packet Filter programs which implement task-defined system call fi...
    Rule Medium Severity
    Show

  • Enable different security models

    This allows you to choose different security modules to be configured into your kernel. The configuration that was used to build kernel is availab...
    Rule Medium Severity
    Show

  • Enable Yama support

    This enables support for LSM module Yama, which extends DAC support with additional system-wide security settings beyond regular Linux discretionar...
    Rule Medium Severity
    Show

  • 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 buil...
    Rule Medium Severity
    Show

  • 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 bein...
    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 ca...
    Rule Medium Severity
    Show

  • 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 ...
    Rule Low Severity
    Show

  • Kernel GCC plugin configuration

    Contains rules that check the configuration of GCC plugins used by the compiler
    Group
    Show

  • Configure Syslog

    The syslog service has been the default Unix logging mechanism for many years. It has a number of downsides, including inconsistent log format, lac...
    Group
    Show

  • Ensure rsyslog-gnutls is installed

    TLS protocol support for rsyslog is installed. The <code>rsyslog-gnutls</code> package can be installed with the following command: <pre> $ sudo y...
    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 Red Hat Enterprise Linux 7. The <code>rsyslog</code> service can be e...
    Rule Medium Severity
    Show

  • Disable Logwatch on Clients if a Logserver Exists

    Does your site have a central logserver which has been configured to report on logs received from all systems? If so: <pre>$ sudo rm /etc/cron.dail...
    Rule Unknown Severity
    Show

  • Ensure rsyslog Default File Permissions Configured

    rsyslog will create logfiles that do not already exist on the system. This settings controls what permissions will be applied to these newly create...
    Rule Medium Severity
    Show

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