1. Introduction
Nessus was able to parse the Network Interface data on the remote host. This means that information about your network configuration is readable via SSH, which could aid an attacker in reconnaissance. Systems running any SSH server are usually affected. A compromise of confidentiality may occur if this data falls into the wrong hands.
2. Technical Explanation
The vulnerability occurs because Nessus can successfully parse the network interface configuration details from the remote host via SSH. This is not a direct exploit, but rather an information disclosure issue that could assist in further attacks. There are no specific preconditions needed beyond having an accessible SSH server. An attacker could use this information to map your network and identify potential targets.
- Root cause: The SSH server allows parsing of network interface data.
- Exploit mechanism: An attacker connects via SSH and uses commands to retrieve the network configuration details.
- Scope: Systems running any SSH server are affected.
3. Detection and Assessment
To confirm whether a system is vulnerable, check if Nessus reports successfully parsing network interface data. A quick check involves reviewing Nessus scan results for this specific finding.
- Quick checks: Review the Nessus scan report for “Enumerate the Network Interface configuration via SSH”.
- Scanning: Nessus vulnerability ID is not provided in context.
- Logs and evidence: No logs are directly indicative of this issue; rely on Nessus findings.
4. Solution / Remediation Steps
There is no direct fix provided in the context. This vulnerability appears to be an informational finding, and may not require remediation unless you have concerns about SSH access control.
4.1 Preparation
- No backups or snapshots are specifically needed for this issue.
- No services need to be stopped. A roll back plan is not required as no changes are being made.
- Change window needs and approvals are not relevant in this case.
4.2 Implementation
- Step 1: Review SSH access controls and restrict access to authorized users only.
4.3 Config or Code Example
Before
After
4.4 Security Practices Relevant to This Vulnerability
Least privilege and access control are relevant practices.
- Practice 1: Implement least privilege principles, granting only necessary SSH access to users.
4.5 Automation (Optional)
No automation is suitable for this vulnerability type as it’s an informational finding.
5. Verification / Validation
Confirm the fix by verifying that SSH access is restricted to authorized users only. Re-run the Nessus scan to confirm the finding is no longer present.
- Post-fix check: Verify SSH access is limited to authorized personnel.
- Re-test: Re-run the Nessus scan and ensure “Enumerate the Network Interface configuration via SSH” is not reported.
- Smoke test: Ensure authorized users can still connect via SSH.
- Monitoring: No specific log query or alert is recommended for this issue.
6. Preventive Measures and Monitoring
Update security baselines to include restricted SSH access controls.
- Baselines: Update a security baseline or policy to enforce least privilege for SSH access.
7. Risks, Side Effects, and Roll Back
Restricting SSH access could disrupt legitimate users if not carefully planned. To roll back, restore the original SSH configuration.
- Risk or side effect 1: Disruption of authorized user access if restrictions are too strict.
- Roll back: Restore the previous SSH configuration file.
8. References and Resources
No specific references were provided in context.
- Vendor advisory or bulletin: Not available.
- NVD or CVE entry: Not available.
- Product or platform documentation relevant to the fix: Not available.