Red Hat Enterprise Linux 9 Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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RHEL 9 must enable the hardware random number generator entropy gatherer service.
<VulnDiscussion>The most important characteristic of a random number generator is its randomness, namely its ability to deliver random number...Rule Low Severity -
SRG-OS-000269-GPOS-00103
<GroupDescription></GroupDescription>Group -
RHEL 9 systemd-journald service must be enabled.
<VulnDiscussion>In the event of a system failure, RHEL 9 must preserve any information necessary to determine cause of failure and any inform...Rule Medium Severity -
SRG-OS-000324-GPOS-00125
<GroupDescription></GroupDescription>Group -
The systemd Ctrl-Alt-Delete burst key sequence in RHEL 9 must be disabled.
<VulnDiscussion>A locally logged-on user who presses Ctrl-Alt-Delete when at the console can reboot the system. If accidentally pressed, as c...Rule High Severity -
SRG-OS-000324-GPOS-00125
<GroupDescription></GroupDescription>Group -
The x86 Ctrl-Alt-Delete key sequence must be disabled on RHEL 9.
<VulnDiscussion>A locally logged-on user who presses Ctrl-Alt-Delete when at the console can reboot the system. If accidentally pressed, as c...Rule High Severity -
SRG-OS-000324-GPOS-00125
<GroupDescription></GroupDescription>Group -
RHEL 9 debug-shell systemd service must be disabled.
<VulnDiscussion>The debug-shell requires no authentication and provides root privileges to anyone who has physical access to the machine. Whi...Rule Medium Severity -
SRG-OS-000080-GPOS-00048
<GroupDescription></GroupDescription>Group -
RHEL 9 must require a boot loader superuser password.
<VulnDiscussion>To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DOD-ap...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must disable the ability of systemd to spawn an interactive boot process.
<VulnDiscussion>Using interactive or recovery boot, the console user could disable auditing, firewalls, or other services, weakening system s...Rule Medium Severity -
SRG-OS-000080-GPOS-00048
<GroupDescription></GroupDescription>Group -
RHEL 9 must require a unique superusers name upon booting into single-user and maintenance modes.
<VulnDiscussion>Having a nondefault grub superuser username makes password-guessing attacks less effective.</VulnDiscussion><FalsePo...Rule High Severity -
RHEL 9 must disable virtual system calls.
<VulnDiscussion>System calls are special routines in the Linux kernel, which userspace applications ask to do privileged tasks. Invoking a sy...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must clear the page allocator to prevent use-after-free attacks.
<VulnDiscussion>Poisoning writes an arbitrary value to freed pages, so any modification or reference to that page after being freed or before...Rule Medium Severity -
SRG-OS-000433-GPOS-00192
<GroupDescription></GroupDescription>Group -
RHEL 9 must clear SLUB/SLAB objects to prevent use-after-free attacks.
<VulnDiscussion>Some adversaries launch attacks with the intent of executing code in nonexecutable regions of memory or in memory locations t...Rule Medium Severity
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