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CVE-2020-15318 : Security Advisory and Response

Learn about CVE-2020-15318 affecting Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1. Discover the impact, affected systems, exploitation, and mitigation steps.

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded DSA SSH key for the root account within the /opt/mysql chroot directory tree.

Understanding CVE-2020-15318

This CVE involves a vulnerability in Zyxel CloudCNM SecuManager versions 3.1.0 and 3.1.1 where a hardcoded DSA SSH key is present for the root account.

What is CVE-2020-15318?

The vulnerability in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allows unauthorized access to the root account due to the presence of a hardcoded DSA SSH key within the /opt/mysql chroot directory tree.

The Impact of CVE-2020-15318

This vulnerability could lead to unauthorized access to the root account, potentially resulting in unauthorized actions and data breaches.

Technical Details of CVE-2020-15318

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 are affected by a hardcoded DSA SSH key for the root account.

Vulnerability Description

The hardcoded DSA SSH key within the /opt/mysql chroot directory tree allows unauthorized access to the root account in Zyxel CloudCNM SecuManager versions 3.1.0 and 3.1.1.

Affected Systems and Versions

        Product: Zyxel CloudCNM SecuManager
        Versions: 3.1.0 and 3.1.1

Exploitation Mechanism

Attackers can exploit this vulnerability by utilizing the hardcoded DSA SSH key to gain unauthorized access to the root account.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2020-15318.

Immediate Steps to Take

        Disable SSH access to the affected Zyxel CloudCNM SecuManager devices.
        Monitor for any unauthorized access attempts.

Long-Term Security Practices

        Regularly update and patch Zyxel CloudCNM SecuManager to eliminate vulnerabilities.
        Implement strong password policies and multi-factor authentication.

Patching and Updates

        Apply the latest patches and updates provided by Zyxel to remove the hardcoded DSA SSH key vulnerability.

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