Red Hat Enterprise Linux 7 Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The Red Hat Enterprise Linux operating system must be configured so that all world-writable directories are owned by root, sys, bin, or an application user.
If a world-writable directory is not owned by root, sys, bin, or an application User Identifier (UID), unauthorized users may be able to modify files created by others. The only authorized public ...Rule Medium Severity -
SRG-OS-000057-GPOS-00027
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The Red Hat Enterprise Linux operating system must protect audit information from unauthorized read, modification, or deletion.
If audit information were to become compromised, then forensic analysis and discovery of the true source of potentially malicious system activity is impossible to achieve. To ensure the veracity o...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
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The Red Hat Enterprise Linux operating system SSH daemon must prevent remote hosts from connecting to the proxy display.
When X11 forwarding is enabled, there may be additional exposure to the server and client displays if the sshd proxy display is configured to listen on the wildcard address. By default, sshd binds ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
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SRG-OS-000480-GPOS-00227
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The Red Hat Enterprise Linux operating system must use the invoking user's password for privilege escalation when using "sudo".
The sudoers security policy requires that users authenticate themselves before they can use sudo. When sudoers requires authentication, it validates the invoking user's credentials. If the rootpw, ...Rule Medium Severity -
SRG-OS-000373-GPOS-00156
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The Red Hat Enterprise Linux operating system must require re-authentication when using the "sudo" command.
Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability,...Rule Medium Severity -
SRG-OS-000080-GPOS-00048
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SRG-OS-000080-GPOS-00048
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Red Hat Enterprise Linux operating systems version 7.2 or newer booted with United Extensible Firmware Interface (UEFI) must have a unique name for the grub superusers account when booting into single-user mode and maintenance.
If the system does not require valid authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all file...Rule Medium Severity -
SRG-OS-000324-GPOS-00125
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SRG-OS-000324-GPOS-00125
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The Red Hat Enterprise Linux operating system must not allow privileged accounts to utilize SSH.
Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileg...Rule Medium Severity -
SRG-OS-000324-GPOS-00125
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The Red Hat Enterprise Linux operating system must elevate the SELinux context when an administrator calls the sudo command.
Preventing nonprivileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privilege...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
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The Red Hat Enterprise Linux operating system must not have accounts configured with blank or null passwords.
If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with empty passwords should never be used in operational environments.Rule High Severity -
SRG-OS-000480-GPOS-00227
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SRG-OS-000373-GPOS-00156
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SRG-OS-000445-GPOS-00199
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SRG-OS-000123-GPOS-00064
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The Red Hat Enterprise Linux operating system must automatically expire temporary accounts within 72 hours.
Temporary accounts are privileged or nonprivileged accounts that are established during pressing circumstances, such as new software or hardware configuration or an incident response, where the nee...Rule Medium Severity -
SRG-OS-000033-GPOS-00014
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SRG-OS-000029-GPOS-00010
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The Red Hat Enterprise Linux operating system must have the screen package installed.
A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporar...Rule Medium Severity -
SRG-OS-000138-GPOS-00069
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The Red Hat Enterprise Linux operating system must restrict access to the kernel message buffer.
Restricting access to the kernel message buffer limits access only to root. This prevents attackers from gaining additional system information as a non-privileged user.Rule Low Severity -
SRG-OS-000073-GPOS-00041
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The Red Hat Enterprise Linux operating system must be configured to prevent overwriting of custom authentication configuration settings by the authconfig utility.
When using the authconfig utility to modify authentication configuration settings, the "system-auth" and "password-auth" files and any custom settings that they may contain are overwritten. This ca...Rule Medium Severity -
SRG-OS-000366-GPOS-00153
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The Red Hat Enterprise Linux operating system must ensure cryptographic verification of vendor software packages.
Cryptographic verification of vendor software packages ensures that all software packages are obtained from a valid source and protects against spoofing that could lead to installation of malware o...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
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The Red Hat Enterprise Linux operating system must disable the login screen user list for graphical user interfaces.
Leaving the user list enabled is a security risk as it allows anyone with physical access to the system to enumerate known user accounts without authenticated access to the system.Rule Medium Severity -
SRG-OS-000363-GPOS-00150
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The Red Hat Enterprise Linux operating system must be configured to allow sending email notifications of configuration changes and adverse events to designated personnel.
Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to operating system configuratio...Rule Medium Severity
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