Security & Risk
Linux Security Hardening
Strengthen Linux across accounts, SSH, privileges, services, firewalls, filesystems, auditing, logging, and kernel settings.
A default Linux installation should be adapted to the server role and risk profile. We remove unnecessary services, access, and configuration without breaking the workload.
When this service is needed
- A new server is entering production or becoming internet-facing.
- Configuration differs across hosts and is difficult to audit.
- Accounts, SSH, sudo, firewalls, or logging lack governance.
- The organisation needs a hardening baseline and evidence.
Scope
- OS, package, service, port, account, and access-path inventory.
- SSH, authentication, sudo, password, key, and session controls.
- Firewalls, network services, kernel parameters, and protocol exposure.
- Filesystem permissions, mount options, temporary paths, and sensitive files.
- Auditing, logging, time synchronisation, integrity monitoring, and alerts.
- Baseline reports, exceptions, remediation, rollback, and retesting.
Security methodology
- Scope and baseline: establish assets, access, exposure, and business function.
- Assessment: collect evidence and validate conditions.
- Prioritisation: evaluate likelihood, impact, effort, and dependencies.
- Remediation: introduce change with backup, checkpoints, and rollback.
- Verification: retest and retain closure evidence.
- Handover: deliver risk registers, exceptions, and maintenance guidance.
Deliverables
- Baselines and validated findings.
- Risk ratings and a prioritised remediation plan.
- Change, exception, and rollback records.
- Retest evidence and control-maintenance guidance.
Intended outcomes
Linux gains a baseline aligned with its server role, controlled access, and security deviations that can be reviewed over time.