Guide to the Secure Configuration of Red Hat Enterprise Linux CoreOS 4
Rules, Groups, and Values defined within the XCCDF Benchmark
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Verify that System Executables Have Root Ownership
System executables are stored in the following directories by default: <pre>/bin /sbin /usr/bin /usr/libexec /usr/local/bin /usr/local/sbin /usr/sbin</pre> All files in these directories should be ...Rule Medium Severity -
Verify that Shared Library Files Have Root Ownership
System-wide shared library files, which are linked to executables during process load time or run time, are stored in the following directories by default: <pre>/lib /lib64 /usr/lib /usr/lib64 </pr...Rule Medium Severity -
Verify that System Executables Have Restrictive Permissions
System executables are stored in the following directories by default: <pre>/bin /sbin /usr/bin /usr/libexec /usr/local/bin /usr/local/sbin /usr/sbin</pre> All files in these directories should not...Rule Medium Severity -
Disable Mounting of hfsplus
To configure the system to prevent the <code>hfsplus</code> kernel module from being loaded, add the following line to the file <code>/etc/modprobe.d/hfsplus.conf</code>: <pre>install hfsplus /bin...Rule Low Severity -
Restrict Dynamic Mounting and Unmounting of Filesystems
Linux includes a number of facilities for the automated addition and removal of filesystems on a running system. These facilities may be necessary in many environments, but this capability also ca...Group -
Disable Booting from USB Devices in Boot Firmware
Configure the system boot firmware (historically called BIOS on PC systems) to disallow booting from USB drives.Rule Unknown Severity -
Disable Kernel Support for USB via Bootloader Configuration
All USB support can be disabled by adding the <code>nousb</code> argument to the kernel's boot loader configuration. To do so, Add the <code>nousb</code> kernel argument via a <code>MachineConfig</...Rule Medium Severity -
Disable Kernel Support for USB via Bootloader Configuration
All USB support can be disabled by adding the <code>nousb</code> argument to the kernel's boot loader configuration. To do so, append "nousb" to the kernel line in <code>/etc/default/grub</code> as...Rule Unknown Severity -
Disable Mounting of cramfs
To configure the system to prevent the <code>cramfs</code> kernel module from being loaded, add the following line to the file <code>/etc/modprobe.d/cramfs.conf</code>: <pre>install cramfs /bin/fa...Rule Low Severity -
Disable Mounting of freevxfs
To configure the system to prevent the <code>freevxfs</code> kernel module from being loaded, add the following line to the file <code>/etc/modprobe.d/freevxfs.conf</code>: <pre>install freevxfs /...Rule Low Severity -
Disable Mounting of hfs
To configure the system to prevent the <code>hfs</code> kernel module from being loaded, add the following line to the file <code>/etc/modprobe.d/hfs.conf</code>: <pre>install hfs /bin/false</pre>...Rule Low Severity -
Disable Mounting of udf
To configure the system to prevent the <code>udf</code> kernel module from being loaded, add the following line to the file <code>/etc/modprobe.d/udf.conf</code>: <pre>install udf /bin/false</pre>...Rule Low Severity -
Disable Modprobe Loading of USB Storage Driver
To prevent USB storage devices from being used, configure the kernel module loading system to prevent automatic loading of the USB storage driver. To configure the system to prevent the <code>usb-...Rule Medium Severity -
Disable Mounting of vFAT filesystems
To configure the system to prevent the <code>vfat</code> kernel module from being loaded, add the following line to the file <code>/etc/modprobe.d/vfat.conf</code>: <pre>install vfat /bin/false</p...Rule Low Severity -
Restrict Partition Mount Options
System partitions can be mounted with certain options that limit what files on those partitions can do. These options are set in the <code>/etc/fstab</code> configuration file, and can be used to m...Group -
Removable Partition
This value is used by the checks mount_option_nodev_removable_partitions, mount_option_nodev_removable_partitions, and mount_option_nodev_removable_partitions to ensure that the correct mount optio...Value -
Add nodev Option to /boot
The <code>nodev</code> mount option can be used to prevent device files from being created in <code>/boot</code>. Legitimate character and block devices should exist only in the <code>/dev</code> d...Rule Medium Severity -
Add nosuid Option to /boot
The <code>nosuid</code> mount option can be used to prevent execution of setuid programs in <code>/boot</code>. The SUID and SGID permissions should not be required on the boot partition. Add the <...Rule Medium Severity -
Add nodev Option to /dev/shm
The <code>nodev</code> mount option can be used to prevent creation of device files in <code>/dev/shm</code>. Legitimate character and block devices should not exist within temporary directories li...Rule Medium Severity -
Add noexec Option to /tmp
The <code>noexec</code> mount option can be used to prevent binaries from being executed out of <code>/tmp</code>. Add the <code>noexec</code> option to the list of <code>Options</code> in the <cod...Rule Medium Severity -
Add noexec Option to /dev/shm
The <code>noexec</code> mount option can be used to prevent binaries from being executed out of <code>/dev/shm</code>. It can be dangerous to allow the execution of binaries from world-writable tem...Rule Medium Severity -
Add nosuid Option to /dev/shm
The <code>nosuid</code> mount option can be used to prevent execution of setuid programs in <code>/dev/shm</code>. The SUID and SGID permissions should not be required in these world-writable dire...Rule Medium Severity -
Add nodev Option to /home
The <code>nodev</code> mount option can be used to prevent device files from being created in <code>/home</code>. Legitimate character and block devices should exist only in the <code>/dev</code> d...Rule Unknown Severity -
Add nosuid Option to /home
The <code>nosuid</code> mount option can be used to prevent execution of setuid programs in <code>/home</code>. The SUID and SGID permissions should not be required in these user data directories. ...Rule Medium Severity -
Add nodev Option to Non-Root Local Partitions
The <code>nodev</code> mount option prevents files from being interpreted as character or block devices. Legitimate character and block devices should exist only in the <code>/dev</code> directory ...Rule Medium Severity -
Add nodev Option to Removable Media Partitions
The <code>nodev</code> mount option prevents files from being interpreted as character or block devices. Legitimate character and block devices should exist only in the <code>/dev</code> directory ...Rule Medium Severity -
Add noexec Option to Removable Media Partitions
The <code>noexec</code> mount option prevents the direct execution of binaries on the mounted filesystem. Preventing the direct execution of binaries from removable media (such as a USB key) provid...Rule Medium Severity -
Add nosuid Option to Removable Media Partitions
The <code>nosuid</code> mount option prevents set-user-identifier (SUID) and set-group-identifier (SGID) permissions from taking effect. These permissions allow users to execute binaries with the s...Rule Medium Severity -
Add nodev Option to /tmp
The <code>nodev</code> mount option can be used to prevent device files from being created in <code>/tmp</code>. Legitimate character and block devices should not exist within temporary directories...Rule Medium Severity -
Add nosuid Option to /tmp
The <code>nosuid</code> mount option can be used to prevent execution of setuid programs in <code>/tmp</code>. The SUID and SGID permissions should not be required in these world-writable directori...Rule Medium Severity -
Add nodev Option to /var/log/audit
The <code>nodev</code> mount option can be used to prevent device files from being created in <code>/var/log/audit</code>. Legitimate character and block devices should exist only in the <code>/dev...Rule Medium Severity -
Add noexec Option to /var/log/audit
The <code>noexec</code> mount option can be used to prevent binaries from being executed out of <code>/var/log/audit</code>. Add the <code>noexec</code> option to the list of <code>Options</code> i...Rule Medium Severity -
Add nosuid Option to /var/log/audit
The <code>nosuid</code> mount option can be used to prevent execution of setuid programs in <code>/var/log/audit</code>. The SUID and SGID permissions should not be required in directories containi...Rule Medium Severity -
Add nodev Option to /var/log
The <code>nodev</code> mount option can be used to prevent device files from being created in <code>/var/log</code>. Legitimate character and block devices should exist only in the <code>/dev</code...Rule Medium Severity -
Add noexec Option to /var/log
The <code>noexec</code> mount option can be used to prevent binaries from being executed out of <code>/var/log</code>. Add the <code>noexec</code> option to the list of <code>Options</code> in the ...Rule Medium Severity -
Add nosuid Option to /var/log
The <code>nosuid</code> mount option can be used to prevent execution of setuid programs in <code>/var/log</code>. The SUID and SGID permissions should not be required in directories containing log...Rule Medium Severity -
Add nodev Option to /var
The <code>nodev</code> mount option can be used to prevent device files from being created in <code>/var</code>. Legitimate character and block devices should exist only in the <code>/dev</code> di...Rule Medium Severity -
Add nodev Option to /var/tmp
The <code>nodev</code> mount option can be used to prevent device files from being created in <code>/var/tmp</code>. Legitimate character and block devices should not exist within temporary directo...Rule Medium Severity -
Add noexec Option to /var/tmp
The <code>noexec</code> mount option can be used to prevent binaries from being executed out of <code>/var/tmp</code>. Add the <code>noexec</code> option to the list of <code>Options</code> in the ...Rule Medium Severity -
Add nosuid Option to /var/tmp
The <code>nosuid</code> mount option can be used to prevent execution of setuid programs in <code>/var/tmp</code>. The SUID and SGID permissions should not be required in these world-writable direc...Rule Medium Severity -
Restrict Programs from Dangerous Execution Patterns
The recommendations in this section are designed to ensure that the system's features to protect against potentially dangerous program execution are activated. These protections are applied at the ...Group -
Disable the uvcvideo module
If the device contains a camera it should be covered or disabled when not in use.Rule Medium Severity -
Restrict Access to Kernel Message Buffer
To set the runtime status of the <code>kernel.dmesg_restrict</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w kernel.dmesg_restrict=1</pre> To make sure that the setting is...Rule Low Severity -
Disable Kernel Image Loading
To set the runtime status of the <code>kernel.kexec_load_disabled</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w kernel.kexec_load_disabled=1</pre> To make sure that the ...Rule Medium Severity -
Kernel panic on oops
To set the runtime status of the <code>kernel.panic_on_oops</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w kernel.panic_on_oops=1</pre> To make sure that the setting is p...Rule Medium Severity -
Disallow kernel profiling by unprivileged users
To set the runtime status of the <code>kernel.perf_event_paranoid</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w kernel.perf_event_paranoid=2</pre> To make sure that the ...Rule Low Severity -
Harden the operation of the BPF just-in-time compiler
To set the runtime status of the <code>net.core.bpf_jit_harden</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.core.bpf_jit_harden=2</pre> To make sure that the settin...Rule Medium Severity -
Disable the use of user namespaces
To set the runtime status of the <code>user.max_user_namespaces</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w user.max_user_namespaces=0</pre> To make sure that the set...Rule Medium Severity -
Disable acquiring, saving, and processing core dumps
Thesystemd-coredump.socketunit is a socket activation of thesystemd-coredump@.servicewhich processes core dumps. By masking the unit, core dump processing is disabled.Rule Medium Severity -
Disable core dump backtraces
The <code>ProcessSizeMax</code> option in <code>[Coredump]</code> section of <code>/etc/systemd/coredump.conf</code> specifies the maximum size in bytes of a core which will be processed. Core dump...Rule Medium Severity
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