How to remediate – NETGEAR FM114P ProSafe Router Multiple Vulnerabilities

1. Introduction

The NETGEAR FM114P ProSafe Router Multiple Vulnerabilities relate to information disclosure and firewall bypass on affected devices. This flaw allows an attacker to steal usernames and passwords used for WAN access, and disable the device’s firewall. These vulnerabilities could compromise network security, leading to data breaches or unauthorized access. Confidentiality, integrity, and availability may be impacted.

2. Technical Explanation

The NETGEAR FM114P ProSafe Wireless Router discloses credentials when processing specially crafted UPnP soap requests. An attacker can send these requests remotely to obtain the WAN username and password. Additionally, an attacker could use Universal Plug and Play (UPnP) functionality to disable firewall rules configured on the router. Exploitation requires network access to the affected device.

• Root cause: The router does not properly validate input received in UPnP requests, leading to information leakage.
• Exploit mechanism: An attacker sends a crafted UPnP request to retrieve WAN credentials and then uses further requests to disable firewall rules. For example, an attacker could use a tool like SoapUI to construct and send the malicious SOAP request.
• Scope: NETGEAR FM114P ProSafe Wireless Router is confirmed affected. Other devices in the ProSafe range may also be vulnerable.

3. Detection and Assessment

You can confirm vulnerability by checking the router’s firmware version and configuration settings. A thorough assessment involves monitoring network traffic for suspicious UPnP activity.

• Quick checks: Access the router’s web interface and check the firmware version under Administration > Firmware Update. Also, verify if remote management is enabled under Security > Remote Management.
• Scanning: Nessus plugin ID 32895 may detect this vulnerability as an example only.
• Logs and evidence: Check router logs for unusual UPnP activity or failed login attempts from unexpected sources. Log files are typically located in the router’s web interface under Maintenance > Logs.

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4. Solution / Remediation Steps

To fix this issue, reconfigure the device to disable remote management or UPnP functionality.

4.1 Preparation

• Dependencies: Access to the router’s web interface with administrative privileges. A roll back plan involves restoring the backed-up configuration if issues arise.
• Change window: Standard maintenance window recommended, approval from network administrator may be needed.

4.2 Implementation

1. Step 1: Log in to the router’s web interface with administrative credentials.
2. Step 2: Navigate to Security > Remote Management and disable remote management access.
3. Step 3: Navigate to Advanced > UPnP and disable UPnP functionality.
4. Step 4: Save the changes and reboot the router if prompted.

4.3 Config or Code Example

Before

Remote Management: Enabled
UPnP: Enabled

After

Remote Management: Disabled
UPnP: Disabled

4.4 Security Practices Relevant to This Vulnerability

Practices that directly address this vulnerability type include least privilege and safe defaults.

• Practice 1: Least privilege reduces the impact if an attacker gains access by limiting what they can do.
• Practice 2: Safe defaults, such as disabling remote management and UPnP by default, minimize the attack surface.

4.5 Automation (Optional)

No suitable automation script is available for this specific vulnerability due to limited router API access.

5. Verification / Validation

Confirm the fix by checking that remote management and UPnP are disabled, and re-running earlier detection methods.

• Post-fix check: Access the router’s web interface and verify that Remote Management is disabled under Security > Remote Management and UPnP is disabled under Advanced > UPnP.
• Re-test: Repeat the quick checks from section 3 to confirm remote management and UPnP are no longer enabled.
• Monitoring: Monitor router logs for any attempts to enable remote management or UPnP, as an example alert.

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6. Preventive Measures and Monitoring

Update security baselines to include disabling unnecessary services like remote management and UPnP. Implement configuration review cycles.

• Baselines: Update your network device baseline or policy to require disabling remote management and UPnP on all routers, for example using a CIS control.
• Pipelines: Include checks in deployment pipelines to ensure new devices are configured with secure defaults.
• Asset and patch process: Implement a regular configuration review cycle (e.g., quarterly) to verify settings remain compliant.

7. Risks, Side Effects, and Roll Back

Disabling remote management may impact remote administration capabilities. Disabling UPnP could affect some applications that rely on it.

• Risk or side effect 1: Loss of remote access if remote management is disabled without alternative access methods. Mitigate by establishing local console access or using a secure VPN connection.
• Roll back: Step 1: Log in to the router’s web interface. Step 2: Navigate to Security > Remote Management and re-enable remote management if needed. Step 3: Navigate to Advanced > UPnP and re-enable UPnP functionality if required. Step 4: Save changes and reboot the router.

8. References and Resources

• Vendor advisory or bulletin: https://seclists.org/bugtraq/2003/Apr/45
• NVD or CVE entry: No specific CVE is available for this vulnerability, but related information can be found at https://seclists.org/bugtraq/2003/Apr/56
• Product or platform documentation relevant to the fix: https://www.netgear.com/support/