CVE-2022-0910 : What You Need to Know

This article provides an overview of CVE-2022-0910, a vulnerability found in Zyxel USG/ZyWALL, USG FLEX, ATP, and VPN series firmware versions, potentially allowing attackers to bypass two-factor authentication.

Understanding CVE-2022-0910

CVE-2022-0910 is a vulnerability in Zyxel firmware versions that can enable authenticated attackers to bypass the second authentication phase, leading to potential security risks.

What is CVE-2022-0910?

The vulnerability involves a downgrade from two-factor authentication to one-factor authentication in Zyxel firmware versions, allowing attackers to connect to the IPsec VPN server despite the 2FA mechanism.

The Impact of CVE-2022-0910

With a CVSS base score of 6.5, this medium-severity vulnerability poses a risk of high integrity impact, potentially exploited by authenticated attackers with low privileges over the network.

Technical Details of CVE-2022-0910

The technical details include vulnerability descriptions, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability resides in the CGI program of Zyxel firmware versions, enabling the bypass of the two-factor authentication mechanism and allowing unauthorized access to the IPsec VPN server.

Affected Systems and Versions

Impacted systems include USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21.

Exploitation Mechanism

An authenticated attacker can exploit the vulnerability by downgrading the authentication process from two factors to one factor, thereby gaining unauthorized access to the IPsec VPN server.

Mitigation and Prevention

To mitigate the risks associated with CVE-2022-0910, immediate steps should be taken by users and organizations.

Immediate Steps to Take

Users are advised to update their firmware to the latest patched versions to address the vulnerability promptly.

Long-Term Security Practices

Implementing robust authentication mechanisms and monitoring network access can enhance overall security posture.

Patching and Updates

Regularly applying security patches, staying informed about security advisories, and maintaining secure configurations are vital for preventing potential exploits.