CVE-2023-5650 : What You Need to Know

This CVE record pertains to an improper privilege management vulnerability found in Zyxel products, specifically in the ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions 4.16 through 5.37, USG20(W)-VPN series firmware versions 4.16 through 5.37, and VPN series firmware versions 4.30 through 5.37.

Understanding CVE-2023-5650

This section will delve into the details surrounding CVE-2023-5650, including its nature and impact on affected systems.

What is CVE-2023-5650?

The vulnerability identified as CVE-2023-5650 relates to improper privilege management within the ZySH of various Zyxel firmware versions, potentially permitting an authenticated local attacker to modify the URL of the registration page in the web GUI of the impacted devices.

The Impact of CVE-2023-5650

The vulnerability could be exploited by an attacker with local access, leading to potential unauthorized alterations in the web GUI registration page URL, posing a risk to the integrity of the affected systems.

Technical Details of CVE-2023-5650

In this section, we will outline the technical specifics of CVE-2023-5650, including the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability stems from improper privilege management in the ZySH component of the specified Zyxel firmware versions, creating a loophole that could allow local attackers to manipulate the registration page URL.

Affected Systems and Versions

The following Zyxel product lines are susceptible to this privilege management flaw: ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions 4.16 through 5.37, USG20(W)-VPN series firmware versions 4.16 through 5.37, and VPN series firmware versions 4.30 through 5.37.

Exploitation Mechanism

An authenticated local attacker could exploit this vulnerability to tamper with the URL of the registration page in the web graphic user interface (GUI) of the affected Zyxel devices, potentially leading to unauthorized URL modifications.

Mitigation and Prevention

This section will provide insights into best practices for mitigating and preventing the risks associated with CVE-2023-5650.

Immediate Steps to Take

Users are advised to apply security patches or firmware updates provided by Zyxel to address the privilege management vulnerability promptly. Additionally, restricting and monitoring access to sensitive system components can help mitigate potential risks.

Long-Term Security Practices

Implementing strong access controls, regular security assessments, and employee training on cybersecurity best practices can enhance the long-term security posture of the affected systems against similar vulnerabilities.

Patching and Updates

Regularly checking for security advisories from Zyxel and promptly applying recommended patches and updates can help safeguard the ATP series, USG FLEX series, USG FLEX 50(W) series, USG20(W)-VPN series, and VPN series firmware from threats associated with improper privilege management.