CVE-2020-28899 : Exploit Details and Defense Strategies

A vulnerability in the Web CGI Script on ZyXEL LTE4506-M606 V1.00(ABDO.2)C0 devices allows remote unauthenticated attackers to exploit the router's features.

Understanding CVE-2020-28899

What is CVE-2020-28899?

The vulnerability in ZyXEL LTE4506-M606 V1.00(ABDO.2)C0 devices enables attackers to access the router's functionalities without authentication, posing a significant security risk.

The Impact of CVE-2020-28899

The vulnerability permits unauthorized users to perform various actions on the router, such as changing passwords, retrieving Wi-Fi passphrases, sending SMS messages, and altering IP forwarding to access the internal network.

Technical Details of CVE-2020-28899

Vulnerability Description

The flaw in the Web CGI Script on ZyXEL LTE4506-M606 V1.00(ABDO.2)C0 devices allows attackers to exploit the router without authentication, compromising its security.

Affected Systems and Versions

Affected Device: ZyXEL LTE4506-M606 V1.00(ABDO.2)C0
Affected Version: V1.00(ABDO.2)C0

Exploitation Mechanism

Attackers can leverage crafted JSON action data to /cgi-bin/gui.cgi to access and manipulate the router's features without authentication.

Mitigation and Prevention

Immediate Steps to Take

Disable remote access to the router if not required
Implement strong, unique passwords for router access
Regularly monitor router activity for any unauthorized changes

Long-Term Security Practices

Keep router firmware up to date with the latest security patches
Conduct regular security audits and penetration testing to identify vulnerabilities

Patching and Updates

Check for firmware updates from ZyXEL and apply them promptly to address the vulnerability