How to remediate – HPE Network Node Manager i (NNMi) Linux Detection (credentiale…

1. Introduction

HPE Network Node Manager i (NNMi) is network management software installed on Linux hosts. It’s a component used in HPE Automated Network Management Suite, and its presence indicates the system manages network devices. A successful exploit could allow local attackers to gain control of the host. Confidentiality, integrity, and availability may be impacted if compromised.

2. Technical Explanation

HPE NNMi is installed on the remote Linux host. This vulnerability itself does not describe an exploitable flaw but flags a potential attack surface. An attacker gaining access to the system could then attempt further exploitation of NNMi or other services running on the host. There are no known CVEs associated with this detection, however it’s important to ensure systems have appropriate security measures in place.

• Root cause: The software is installed and potentially exposed.
• Exploit mechanism: An attacker would need local access to the system to exploit NNMi or other vulnerabilities on the host.
• Scope: HPE Network Node Manager i (NNMi) running on Linux hosts.

3. Detection and Assessment

Confirming whether a system is vulnerable involves checking for the presence of the software. A quick check can identify if NNMi is installed, while more thorough methods involve examining package lists or running processes.

• Quick checks: Run `dpkg -l | grep nnmi` on Debian/Ubuntu systems, or `rpm -qa | grep nnmi` on Red Hat/CentOS/AlmaLinux systems to check for installed packages.
• Scanning: Nessus vulnerability ID 3187f0b can detect the presence of NNMi. This is an example only.
• Logs and evidence: Check system logs for installation or startup events related to NNMi. Specific log paths vary by distribution.

dpkg -l | grep nnmi

4. Solution / Remediation Steps

Remediating this issue involves assessing the need for NNMi and implementing appropriate security measures if it remains installed. This includes ensuring strong access controls, regular patching, and monitoring for suspicious activity.

4.1 Preparation

• Services: No services need to be stopped.
• Roll back plan: Revert any configuration changes made during the assessment and hardening process.

4.2 Implementation

1. Step 1: Assess whether NNMi is required for business operations. If not, uninstall it using your distribution’s package manager (e.g., `apt remove nnmi` or `yum remove nnmi`).
2. Step 2: If NNMi is required, ensure the system is hardened according to HPE best practices and security guidelines.
3. Step 3: Implement strong access controls, including multi-factor authentication where possible.

4.3 Config or Code Example

Before

# No specific config example, as this is about software presence.  Assume default configuration.

After

# If NNMi is not required:
apt remove nnmi # Debian/Ubuntu
yum remove nnmi # Red Hat/CentOS/AlmaLinux

4.4 Security Practices Relevant to This Vulnerability

Several security practices can help mitigate the risk associated with this vulnerability type. Least privilege reduces the impact of a successful exploit, while regular patching ensures systems are protected against known vulnerabilities.

• Practice 1: Implement least privilege access controls to limit user permissions and reduce the potential damage from compromised accounts.
• Practice 2: Establish a regular patch cadence for all software on the system, including NNMi if it remains installed.

4.5 Automation (Optional)

#!/bin/bash
# Example script to check for NNMi installation
if dpkg -l | grep nnmi >/dev/null; then
  echo "NNMi is installed."
else
  echo "NNMi is not installed."
fi

5. Verification / Validation

Confirming the fix involves verifying that NNMi has been uninstalled if it was deemed unnecessary, or that appropriate security measures have been implemented if it remains in use. A smoke test should confirm core system functionality.

• Post-fix check: Run `dpkg -l | grep nnmi` (Debian/Ubuntu) or `rpm -qa | grep nnmi` (Red Hat/CentOS/AlmaLinux). The output should be empty if uninstalled.
• Re-test: Re-run the initial detection method to confirm NNMi is no longer present, or that security measures are in place.
• Smoke test: Verify basic system functionality such as network connectivity and SSH access.

dpkg -l | grep nnmi

6. Preventive Measures and Monitoring

Preventive measures include updating security baselines to reflect the removal of unnecessary software, and incorporating checks in CI/CD pipelines to prevent similar issues from recurring.

• Baselines: Update system security baselines or policies to disallow installation of NNMi unless specifically required.
• Pipelines: Add checks in CI/CD pipelines to scan for unwanted software packages during deployment.
• Asset and patch process: Review asset inventories regularly to identify unnecessary software installations.

7. Risks, Side Effects, and Roll Back

• Risk or side effect 1: Uninstalling NNMi could impact network monitoring capabilities.
• Roll back: Reinstall NNMi using your distribution’s package manager (e.g., `apt install nnmi` or `yum install nnmi`). Restore from a snapshot if available.

8. References and Resources

• Vendor advisory or bulletin: http://www.nessus.org/u?b3187f0b