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 Permissions on Backup shadow File
To properly set the permissions of/etc/shadow-, run the command:$ sudo chmod 0000 /etc/shadow-
Rule Medium Severity -
Verify Permissions on gshadow File
To properly set the permissions of/etc/gshadow, run the command:$ sudo chmod 0000 /etc/gshadow
Rule Medium Severity -
Verify Permissions on passwd File
To properly set the permissions of/etc/passwd, run the command:$ sudo chmod 0644 /etc/passwd
Rule Medium Severity -
Verify Permissions on shadow File
To properly set the permissions of/etc/shadow, run the command:$ sudo chmod 0000 /etc/shadow
Rule Medium Severity -
Verify Permissions on Files within /var/log Directory
The/var/logdirectory contains files with logs of error messages in the system and should only be accessed by authorized personnel.Group -
Verify Group Who Owns /var/log Directory
To properly set the group owner of/var/log, run the command:$ sudo chgrp root /var/log
Rule Medium Severity -
Verify Group Who Owns /var/log/messages File
To properly set the group owner of/var/log/messages, run the command:$ sudo chgrp root /var/log/messages
Rule Medium Severity -
Verify Group Who Owns /var/log/syslog File
To properly set the group owner of/var/log/syslog, run the command:$ sudo chgrp adm /var/log/syslog
Rule Medium Severity -
Verify User Who Owns /var/log Directory
To properly set the owner of/var/log, run the command:$ sudo chown root /var/log
Rule Medium Severity -
Verify User Who Owns /var/log/messages File
To properly set the owner of/var/log/messages, run the command:$ sudo chown root /var/log/messages
Rule Medium Severity -
Verify User Who Owns /var/log/syslog File
To properly set the owner of/var/log/syslog, run the command:$ sudo chown syslog /var/log/syslog
Rule Medium Severity -
Verify Permissions on /var/log Directory
To properly set the permissions of/var/log, run the command:$ sudo chmod 0755 /var/log
Rule Medium Severity -
Verify Permissions on /var/log/messages File
To properly set the permissions of/var/log/messages, run the command:$ sudo chmod 0640 /var/log/messages
Rule Medium Severity -
cobbler_can_network_connect SELinux Boolean
default - Default SELinux boolean setting.
on - SELinux boolean is enabled.
off - SELinux boolean is disabled.Value -
Verify File Permissions Within Some Important Directories
Some directories contain files whose confidentiality or integrity is notably important and may also be susceptible to misconfiguration over time, p...Group -
Verify that System Executable Have Root Ownership
<pre>/bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin</pre> All these directories should be owned by the <code>root</code> user. If any...Rule Medium Severity -
Verify that Shared Library Directories 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 ...Rule Medium Severity -
Verify that System Executable Directories Have Restrictive Permissions
System executables are stored in the following directories by default: <pre>/bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin</pre> Thes...Rule Medium Severity -
Verify that Shared Library Directories Have Restrictive Permissions
System-wide shared library directories, which contain are linked to executables during process load time or run time, are stored in the following d...Rule Medium Severity -
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/sb...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 ...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/sb...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/modprob...Rule Low Severity -
Verify that Shared Library Files Have Restrictive Permissions
System-wide shared library files, which are linked to executables during process load time or run time, are stored in the following directories by ...Rule Medium 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...Group -
Disable the Automounter
The <code>autofs</code> daemon mounts and unmounts filesystems, such as user home directories shared via NFS, on demand. In addition, autofs can be...Rule Medium Severity -
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<...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 th...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...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/modpro...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/...Rule Low Severity -
cobbler_use_cifs SELinux Boolean
default - Default SELinux boolean setting.
on - SELinux boolean is enabled.
off - SELinux boolean is disabled.Value -
Disable Mounting of jffs2
To configure the system to prevent the <code>jffs2</code> kernel module from being loaded, add the following line to the file <code>/etc/modprobe....Rule Low Severity -
Disable Mounting of squashfs
To configure the system to prevent the <code>squashfs</code> kernel module from being loaded, add the following line to the file <code>/etc/modpro...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/...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. ...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...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/fst...Group -
Value for hidepid option
The hidepid mount option is applicable to /proc and is used to control who can access the information in /proc/[pid] directories. The option can ha...Value -
Removable Partition
This value is used by the checks mount_option_nodev_removable_partitions, mount_option_nodev_removable_partitions, and mount_option_nodev_removable...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 de...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 shoul...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 device...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> opti...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...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 s...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 de...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 shoul...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 sho...Rule Medium Severity
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