Reduce the risk of remote compromise by prioritizing vulnerabilities that are both exploitable and reachable, applying security updates through your distribution’s supported process, limiting network exposure, hardening SSH without locking out administrators, and verifying the result with suitable scans. The commands and procedures below are explicitly for Red Hat Enterprise Linux (RHEL) 8 or 9 where noted; package management and security tooling differ across Linux distributions.
Start with an inventory and a baseline
Before changing a server, establish what it runs and what can reach it. Record its distribution and release, support status, installed packages, enabled services, listening ports, SSH policy, maintenance constraints, and the clients or networks that need access. For each security advisory, verify that the affected product, release, architecture, and package stream match the host. Red Hat advisories identify affected products, severity, fixed issues, and associated CVEs.
This baseline separates a package finding from a practical exposure. A vulnerable component may be installed but not reachable in the current configuration; a later configuration or software change can create an exposure path, so that condition still needs remediation or tracking.
Decide what to fix first
Prioritize exploitation and reachability
Raise the priority of a vulnerability when there is known exploitation and the affected service or code is reachable under the host’s current configuration. Red Hat Lightspeed describes an open path in terms of a port or operating-system version that permits an impact on confidentiality, integrity, or availability. Its “Known exploits” label reflects public exploit code or known public exploitation; it does not show that a particular server has been compromised.
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Use exploitation catalogs as an urgency signal
Check CISA’s Known Exploited Vulnerabilities Catalog as one input to triage, then confirm the product and version against the distribution vendor’s advisory. A generic upstream version comparison can mislead because distributions may backport fixes while retaining an older-looking version string. The catalog changes over time, so consult its current entries rather than relying on a copied count or deadline.
Choose between patching and temporary mitigation
Where a fix is available, plan to install it through the vendor-supported update process. A temporary mitigation may reduce urgency if it closes the exposure path, but it is not a substitute for eventual patching. Weigh known exploitation, actual reachability, patch availability, and the downtime or service impact of applying the fix.
Apply security updates through the distribution’s process
RHEL 8: review advisories and manage updates
For RHEL 8, review Red Hat Security Advisories and use the RHEL-supported package update workflow. Red Hat documents an automatic security-only option using dnf-automatic: set upgrade_type = security in /etc/dnf/automatic.conf, then enable the dnf-automatic-install.timer. This is a RHEL 8 approach, not a universal Linux command or configuration.
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Automatic installation can reduce the chance that a security update is missed, while manual review gives administrators more control over timing and change approval. Either approach needs a tested schedule, staged deployment where appropriate, a recovery plan, and procedures for service restarts and downtime. Confirm how kernel updates and other process restarts will be handled in your environment.
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Confirm that changes are active
After an update, verify that the fixed package or advisory is installed and check whether a reboot or process restart is required. Red Hat documents tooling for identifying processes that need restarting. A completed package transaction alone does not prove that every change is active.
Keep a closeout record for each finding: the advisory or CVE, affected host, package version before and after, patch or mitigation applied, required restart or reboot, verification result, and any accepted exception with its owner and expiry date.
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Reduce the services and network paths exposed to the internet
Remove services the server does not need
Disable unused daemons and update the packages for network services that must remain. Red Hat’s RHEL 7 Security Guide warns, “Potentially, any network service is insecure.” Treat that as a reason to minimize reachable services, not as a claim that every service has the same risk. Red Hat specifically advises against legacy remote shells such as rlogin, rsh, and telnet; use SSH instead.
Restrict necessary services to their intended clients
Use host and perimeter firewall rules to allow a service only from the clients or networks that need it. Services such as NFS and Samba require careful implementation and firewall protection. Do not expose an internal-only service to the public internet simply because it is installed or convenient to reach.
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Moving SSH off its standard port may reduce automated scanning against the default port, but Red Hat characterizes this as security through obscurity. It does not replace patching, strong authentication, access restrictions, or network controls.
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Harden SSH without creating a lockout
Restrict administrative access
On RHEL 8, consider setting PermitRootLogin no if direct root login is not needed. Use individual administrative accounts with controlled privilege escalation instead. Where it fits your account-management model, limit SSH access with AllowUsers or AllowGroups in the SSH daemon configuration.
After changing the configuration, reload sshd for the changes to take effect. Keep an existing administrative session open and verify that a second session can connect under the new policy before closing the first. This precaution helps reduce the risk of losing remote access through a configuration mistake.
Balance stricter algorithms with compatibility and compliance
Restrictive SSH settings can prevent older clients from connecting. Red Hat’s RHEL 8 network-security guidance cautions that most hardening changes reduce compatibility with clients that do not support current algorithms or cipher suites. For example, Ed25519 host keys are not FIPS-140-compliant and do not work with Ed25519 in FIPS mode. Choose authentication and algorithm settings based on the client fleet and applicable compliance requirements.
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RHEL 9: assess vulnerabilities with matching OVAL definitions
Red Hat’s RHEL 9 documentation describes downloading the OVAL definitions that match the release, then evaluating them with:
oscap oval eval --report vulnerability.html rhel-9.oval.xml
Review vulnerability.html and investigate the findings. Remote assessment is also available with oscap-ssh over SSH, using the scanner and utilities installed as documented for the environment.
Assess configuration against a chosen baseline
SCAP Security Guide content can assess a system against a selected hardening or compliance profile. Match the content and profile to the distribution release and the policy you actually need to meet. Scanner coverage depends on the definitions’ applicability and freshness; a clean report is not proof that unknown vulnerabilities are absent or that the host has never been compromised.
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Re-scan after changes and track any residual findings to resolution. For an exception, document why it is accepted, who owns it, and when it expires so a temporary risk decision does not become an unreviewed permanent state.
Choose an update and verification approach that fits the service
| Approach | Best fit | Trade-off and checks |
|---|---|---|
| Manual security updates | Environments that require explicit review, approval, or maintenance-window coordination. | Offers more control over timing, but depends on a reliable review cadence. Plan for downtime, service restarts, and reboot requirements. |
| Automatic security updates | Environments where reducing missed-patch risk is a priority and the update schedule has been tested. | RHEL 8 documents dnf-automatic with upgrade_type = security and dnf-automatic-install.timer. Validate timing, service impact, and restart or reboot handling before relying on it. |
| Local vulnerability scan | Checking a server using definitions appropriate to its distribution release. | Review definition applicability and freshness, and investigate reported findings. A scan does not establish that unknown flaws or compromise are absent. |
| Remote vulnerability scan | Assessing a remote host through SSH where supported and configured. | RHEL 9 documentation describes oscap-ssh. Confirm the required scanner utilities, access, and matching definitions. |
These procedures use Red Hat documentation for RHEL 8 update management and SSH, RHEL 9 vulnerability scanning, and RHEL 7 service-reduction guidance. They should not be treated as identical instructions for Ubuntu, Debian, SUSE, or other distributions; use the relevant vendor’s current guidance for those systems.
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