CVE-2022-35521 Explained : Impact and Mitigation

A command injection vulnerability has been identified in WAVLINK routers, specifically in the firewall.cgi script used by models WN572HP3, WN533A8, WN530H4, WN535G3, and WN531P3. This vulnerability could allow attackers to execute commands via unfiltered parameters in the /man_security.shtml page.

Understanding CVE-2022-35521

This section delves into the details of the CVE-2022-35521 vulnerability in WAVLINK routers.

What is CVE-2022-35521?

The CVE-2022-35521 vulnerability exists in the firewall.cgi script of WAVLINK routers, enabling command injections through specific unfiltered parameters.

The Impact of CVE-2022-35521

Exploitation of this vulnerability can permit threat actors to execute arbitrary commands within the context of the affected router, potentially leading to unauthorized access or other malicious activities.

Technical Details of CVE-2022-35521

Let's explore the technical aspects of the CVE-2022-35521 vulnerability in WAVLINK routers.

Vulnerability Description

The firewall.cgi script in models WN572HP3, WN533A8, WN530H4, WN535G3, and WN531P3 lacks adequate filtering on critical parameters like remoteManagementEnabled, blockPortScanEnabled, pingFrmWANFilterEnabled, and blockSynFloodEnabled, facilitating command injections on the /man_security.shtml page.

Affected Systems and Versions

The affected models include WN572HP3, WN533A8, WN530H4, WN535G3, and WN531P3 routers that utilize the vulnerable firewall.cgi script.

Exploitation Mechanism

Attackers can exploit the unfiltered parameters in the firewall.cgi script to inject and execute malicious commands, potentially compromising the integrity and security of the affected routers.

Mitigation and Prevention

Here's how you can address the CVE-2022-35521 vulnerability in WAVLINK routers.

Immediate Steps to Take

Users should promptly update their routers' firmware to mitigate the risk of exploitation. Disabling remote management capabilities can also help reduce the attack surface.

Long-Term Security Practices

Implementing network segmentation, regularly monitoring router logs for suspicious activities, and enforcing strong access control measures can enhance the overall security posture.

Patching and Updates

Stay informed about security advisories from WAVLINK and apply patches and updates as soon as they become available to safeguard your routers against known vulnerabilities.