II - Mission Support Sensitive
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 cron configuration files directory must be group-owned by root.
<VulnDiscussion>Service configuration files enable or disable features of their respective services that if configured incorrectly can lead t...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
All RHEL 9 world-writable directories must be owned by root, sys, bin, or an application user.
<VulnDiscussion>If a world-writable directory is not owned by root, sys, bin, or an application user identifier (UID), unauthorized users may...Rule Medium Severity -
SRG-OS-000138-GPOS-00069
<GroupDescription></GroupDescription>Group -
A sticky bit must be set on all RHEL 9 public directories.
<VulnDiscussion>Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of infor...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
All RHEL 9 local files and directories must have a valid group owner.
<VulnDiscussion>Files without a valid group owner may be unintentionally inherited if a group is assigned the same Group Identifier (GID) as ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
All RHEL 9 local files and directories must have a valid owner.
<VulnDiscussion>Unowned files and directories may be unintentionally inherited if a user is assigned the same user identifier "UID" as the UI...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must be configured so that all system device files are correctly labeled to prevent unauthorized modification.
<VulnDiscussion>If an unauthorized or modified device is allowed to exist on the system, there is the possibility the system may perform unin...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 /etc/crontab file must have mode 0600.
<VulnDiscussion>Service configuration files enable or disable features of their respective services that if configured incorrectly can lead t...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 /etc/shadow file must have mode 0000 to prevent unauthorized access.
<VulnDiscussion>The "/etc/shadow" file contains the list of local system accounts and stores password hashes. Protection of this file is crit...Rule Medium Severity -
SRG-OS-000096-GPOS-00050
<GroupDescription></GroupDescription>Group -
RHEL 9 must have the firewalld package installed.
<VulnDiscussion>"Firewalld" provides an easy and effective way to block/limit remote access to the system via ports, services, and protocols....Rule Medium Severity -
SRG-OS-000096-GPOS-00050
<GroupDescription></GroupDescription>Group -
The firewalld service on RHEL 9 must be active.
<VulnDiscussion>"Firewalld" provides an easy and effective way to block/limit remote access to the system via ports, services, and protocols....Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
A RHEL 9 firewall must employ a deny-all, allow-by-exception policy for allowing connections to other systems.
<VulnDiscussion>Failure to restrict network connectivity only to authorized systems permits inbound connections from malicious systems. It al...Rule Medium Severity -
SRG-OS-000096-GPOS-00050
<GroupDescription></GroupDescription>Group -
RHEL 9 must control remote access methods.
<VulnDiscussion>To prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embeddi...Rule Medium Severity -
SRG-OS-000420-GPOS-00186
<GroupDescription></GroupDescription>Group -
RHEL 9 must protect against or limit the effects of denial-of-service (DoS) attacks by ensuring rate-limiting measures on impacted network interfaces are implemented.
<VulnDiscussion>DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot ac...Rule Medium Severity -
SRG-OS-000096-GPOS-00050
<GroupDescription></GroupDescription>Group -
RHEL 9 must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the Ports, Protocols, and Services Management (PPSM) Category Assignments List (CAL) and vulnerability assessments.
<VulnDiscussion>To prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embeddi...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 network interfaces must not be in promiscuous mode.
<VulnDiscussion>Network interfaces in promiscuous mode allow for the capture of all network traffic visible to the system. If unauthorized in...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must enable hardening for the Berkeley Packet Filter just-in-time compiler.
<VulnDiscussion>When hardened, the extended Berkeley Packet Filter (BPF) just-in-time (JIT) compiler will randomize any kernel addresses in t...Rule Medium Severity -
SRG-OS-000355-GPOS-00143
<GroupDescription></GroupDescription>Group -
RHEL 9 must have the chrony package installed.
<VulnDiscussion>Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the cor...Rule Medium Severity -
SRG-OS-000355-GPOS-00143
<GroupDescription></GroupDescription>Group -
RHEL 9 chronyd service must be enabled.
<VulnDiscussion>Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the cor...Rule Medium Severity -
SRG-OS-000355-GPOS-00143
<GroupDescription></GroupDescription>Group -
RHEL 9 must securely compare internal information system clocks at least every 24 hours.
<VulnDiscussion>Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the cor...Rule Medium Severity -
SRG-OS-000096-GPOS-00050
<GroupDescription></GroupDescription>Group -
RHEL 9 must disable the chrony daemon from acting as a server.
<VulnDiscussion>Minimizing the exposure of the server functionality of the chrony daemon diminishes the attack surface. Satisfies: SRG-OS-00...Rule Low Severity -
SRG-OS-000096-GPOS-00050
<GroupDescription></GroupDescription>Group -
RHEL 9 must disable network management of the chrony daemon.
<VulnDiscussion>Not exposing the management interface of the chrony daemon on the network diminishes the attack space. Satisfies: SRG-OS-000...Rule Low Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 systems using Domain Name Servers (DNS) resolution must have at least two name servers configured.
<VulnDiscussion>To provide availability for name resolution services, multiple redundant name servers are mandated. A failure in name resolut...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must configure a DNS processing mode set be Network Manager.
<VulnDiscussion>In order to ensure that DNS resolver settings are respected, a DNS mode in Network Manager must be configured.</VulnDiscus...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must not have unauthorized IP tunnels configured.
<VulnDiscussion>IP tunneling mechanisms can be used to bypass network filtering. If tunneling is required, it must be documented with the inf...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must be configured to prevent unrestricted mail relaying.
<VulnDiscussion>If unrestricted mail relaying is permitted, unauthorized senders could use this host as a mail relay for the purpose of sendi...Rule Medium Severity
Node 2
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