Why Server Hardening is a Foundation Control
A freshly deployed server — Windows Server, Linux, or virtualised — ships with default configurations designed for compatibility and ease of deployment, not security. Unnecessary services run, default accounts exist, weak protocols are enabled, and event logging is minimal. CIS Benchmarks — the globally recognised hardening standard — address this systematically. CERT-In's guidelines reference CIS Benchmark compliance as the expected standard for server configuration in regulated sectors.
Server Hardening — 12 Controls Checklist
| # | Control | Status |
|---|---|---|
| 1 | Disable unnecessary services and open ports | Check |
| 2 | Remove or disable default accounts (Administrator, root) | Check |
| 3 | Enforce password complexity and account lockout policy | Check |
| 4 | Enable and configure centralised event logging (SIEM) | Check |
| 5 | Apply current OS and application patches | Check |
| 6 | Enable host-based firewall and restrict inbound rules | Check |
| 7 | Disable legacy protocols (SMBv1, TLS 1.0/1.1, Telnet) | Check |
| 8 | Enable full-disk or volume encryption (BitLocker / LUKS) | Check |
| 9 | Implement role-based access — no shared admin accounts | Check |
| 10 | Configure NTP with authenticated time source | Check |
| 11 | Maintain hardening baseline documentation (Golden Image) | Check |
| 12 | Schedule quarterly CIS Benchmark compliance scans | Check |
Windows vs Linux — Key Differences
Windows Server hardening focuses on Group Policy Objects (GPOs), Windows Defender configuration, SMB settings, and Active Directory privilege boundaries. Linux hardening focuses on SSH configuration (disable root login, key-only auth), SELinux/AppArmor enforcement, cron job auditing, and sysctl kernel parameter hardening. Both platforms have CIS Benchmarks available as free downloadable PDFs — the definitive hardening standard.
Hardening in Virtualised Environments
Hypervisor hardening is often overlooked. VMware vSphere, Microsoft Hyper-V, and KVM each have dedicated CIS Benchmarks. Particular focus areas: disable unused VM features (floppy drives, serial ports, shared folders), restrict host-to-VM communication channels, and ensure hypervisor management interfaces are isolated from production VLANs.
Get a Server Hardening Assessment
InfraVeritas 360 conducts on-site CIS Benchmark assessments across your server estate — Windows, Linux, and virtualised — and delivers a prioritised remediation report mapped to CERT-In and ISO 27001.
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