Sample finding · Severity: High
Internet-facing SSH bastion host
- Observation
- The SSH service on a bastion host answered a connection from an outside address. It is reachable from the entire internet, not just from the office or the VPN.
- Security impact
- Malicious actors from the entire internet can attempt to brute force their way into this server as a way of gaining initial entry into the environment behind it. Even if password authentication is disabled, the host is still susceptible to remote code execution vulnerabilities in the SSH service that can be exploited before a key or certificate is ever checked.
- Fix
- Measure who and what is legitimately interacting with the host. Restrict access to known IP ranges. If unrestricted public access has to remain, conduct a risk analysis to identify mitigating controls and record an exception in the company's risk register.
- Compliance impact
Supporting evidence for:
- HIPAA §164.312(a)(1)
- HITRUST Domain 08
- NIST 800-53 AC-17
References are to the HIPAA Security Rule at 45 CFR Part 164, the HITRUST CSF assessment domains, and NIST SP 800-53 Rev. 5.