Guide to the Secure Configuration of Red Hat Enterprise Linux 10
Rules, Groups, and Values defined within the XCCDF Benchmark
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Enable Kernel Parameter to Use TCP RFC 1337 on IPv4 Interfaces
To set the runtime status of the <code>net.ipv4.tcp_rfc1337</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.tcp_...Rule Medium Severity -
Enable Kernel Parameter to Use TCP Syncookies on Network Interfaces
To set the runtime status of the <code>net.ipv4.tcp_syncookies</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.t...Rule Medium Severity -
Disable Kernel Parameter for Sending ICMP Redirects on all IPv4 Interfaces
To set the runtime status of the <code>net.ipv4.conf.all.send_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w n...Rule Medium Severity -
Disable Kernel Parameter for Sending ICMP Redirects on all IPv4 Interfaces by Default
To set the runtime status of the <code>net.ipv4.conf.default.send_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl ...Rule Medium Severity -
Disable Kernel Parameter for IP Forwarding on IPv4 Interfaces
To set the runtime status of the <code>net.ipv4.ip_forward</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.ip_fo...Rule Medium Severity -
nftables
<code>If firewalld or iptables are being used in your environment, please follow the guidance in their respective section and pass-over the guidanc...Group -
Install nftables Package
nftables provides a new in-kernel packet classification framework that is based on a network-specific Virtual Machine (VM) and a new nft userspace ...Rule Medium Severity -
Verify nftables Service is Disabled
nftables is a subsystem of the Linux kernel providing filtering and classification of network packets/datagrams/frames and is the successor to ipta...Rule Medium Severity -
Verify Group Who Owns /etc/nftables Directory
To properly set the group owner of/etc/nftables, run the command:$ sudo chgrp root /etc/nftables
Rule Medium Severity -
Verify User Who Owns /etc/nftables Directory
To properly set the owner of/etc/nftables, run the command:$ sudo chown root /etc/nftables
Rule Medium Severity -
Verify Permissions On /etc/nftables Directory
To properly set the permissions of/etc/nftables, run the command:$ sudo chmod 0700 /etc/nftables
Rule Medium Severity -
Uncommon Network Protocols
The system includes support for several network protocols which are not commonly used. Although security vulnerabilities in kernel networking code ...Group -
Verify User Who Owns Backup passwd File
To properly set the owner of/etc/passwd-, run the command:$ sudo chown root /etc/passwd-
Rule Medium Severity -
Verify that All World-Writable Directories Have Sticky Bits Set
When the so-called 'sticky bit' is set on a directory, only the owner of a given file may remove that file from the directory. Without the sticky b...Rule Medium Severity -
Verify that system commands directories have root as a group owner
System commands are stored in the following directories: by default: <pre>/bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin </pre> ...Rule Medium Severity -
Verify that system commands directories have root ownership
System commands are stored in the following directories by default: <pre>/bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin </pre> A...Rule Medium Severity -
Verify Group Who Owns /etc/crypttab File
To properly set the group owner of/etc/crypttab, run the command:$ sudo chgrp root /etc/crypttab
Rule Medium Severity -
Verify Group Who Owns System.map Files
The System.map files are symbol map files generated during the compilation of the Linux kernel. They contain the mapping between kernel symbols and...Rule Low Severity -
Verify User Who Owns /etc/crypttab File
To properly set the owner of/etc/crypttab, run the command:$ sudo chown root /etc/crypttab
Rule Medium Severity -
Verify User Who Owns System.map Files
The System.map files are symbol map files generated during the compilation of the Linux kernel. They contain the mapping between kernel symbols and...Rule Low Severity -
Verify Permissions on /etc/audit/auditd.conf
To properly set the permissions of/etc/audit/auditd.conf, run the command:$ sudo chmod 0640 /etc/audit/auditd.conf
Rule Medium Severity -
Verify Permissions on /etc/audit/rules.d/*.rules
To properly set the permissions of <code>/etc/audit/rules.d/*.rules</code>, run the command: <pre>$ sudo chmod 0640 /etc/audit/rules.d/*.rules</pr...Rule Medium Severity -
Verify Permissions On /etc/crypttab File
To properly set the permissions of/etc/crypttab, run the command:$ sudo chmod 0600 /etc/crypttab
Rule Medium Severity -
Verify Permissions on System.map Files
The System.map files are symbol map files generated during the compilation of the Linux kernel. They contain the mapping between kernel symbols and...Rule Low Severity -
Ensure All SGID Executables Are Authorized
The SGID (set group id) bit should be set only on files that were installed via authorized means. A straightforward means of identifying unauthoriz...Rule Medium Severity -
Ensure All SUID Executables Are Authorized
The SUID (set user id) bit should be set only on files that were installed via authorized means. A straightforward means of identifying unauthorize...Rule Medium Severity -
Ensure No World-Writable Files Exist
It is generally a good idea to remove global (other) write access to a file when it is discovered. However, check with documentation for specific a...Rule Medium Severity -
Ensure All Files Are Owned by a Group
If any file is not group-owned by a group present in /etc/group, the cause of the lack of group-ownership must be investigated. Following this, tho...Rule Medium Severity -
Ensure All Files Are Owned by a User
If any files are not owned by a user, then the cause of their lack of ownership should be investigated. Following this, the files should be deleted...Rule Medium Severity -
Enable Kernel Parameter to Enforce DAC on FIFOs
To set the runtime status of the <code>fs.protected_fifos</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.protected_fi...Rule Medium Severity -
Enable Kernel Parameter to Enforce DAC on Hardlinks
To set the runtime status of the <code>fs.protected_hardlinks</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.protecte...Rule Medium Severity -
Enable Kernel Parameter to Enforce DAC on Regular files
To set the runtime status of the <code>fs.protected_regular</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.protected_...Rule Medium Severity -
Enable Kernel Parameter to Enforce DAC on Symlinks
To set the runtime status of the <code>fs.protected_symlinks</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.protected...Rule Medium Severity -
Verify Permissions on Files with Local Account Information and Credentials
The default restrictive permissions for files which act as important security databases such as <code>passwd</code>, <code>shadow</code>, <code>gro...Group -
Verify Permissions and Ownership of Old Passwords File
To properly set the owner of <code>/etc/security/opasswd</code>, run the command: <pre>$ sudo chown root /etc/security/opasswd </pre> To properly ...Rule Medium Severity -
Verify Group Who Owns Backup group File
To properly set the group owner of/etc/group-, run the command:$ sudo chgrp root /etc/group-
Rule Medium Severity -
Verify Group Who Owns Backup gshadow File
To properly set the group owner of/etc/gshadow-, run the command:$ sudo chgrp root /etc/gshadow-
Rule Medium 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 -
Add noexec Option to /home
The <code>noexec</code> mount option can be used to prevent binaries from being executed out of <code>/home</code>. Add the <code>noexec</code> opt...Rule Medium Severity -
Verify that system commands files are group owned by root or a system account
System commands files are stored in the following directories by default: <pre>/bin /sbin /usr/bin /usr/sbin /usr/local/bin /usr/local/sbin </pre> ...Rule Medium Severity -
Verify that audit tools are owned by root
The Red Hat Enterprise Linux 10 operating system audit tools must have the proper ownership configured to protected against unauthorized access. V...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 audit tools Have Mode 0755 or less
The Red Hat Enterprise Linux 10 operating system audit tools must have the proper permissions configured to protected against unauthorized access. ...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 -
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 -
Verify the system-wide library files in directories "/lib", "/lib64", "/usr/lib/" and "/usr/lib64" are group-owned by root.
System-wide library files are stored in the following directories by default: <pre>/lib /lib64 /usr/lib /usr/lib64 </pre> All system-wide shared li...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 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
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