CVE-2022-34746 Explained : Impact and Mitigation

An insufficient entropy vulnerability has been identified in Zyxel GS1900 series firmware versions prior to V2.70. This vulnerability could potentially allow an unauthenticated attacker to retrieve a private key by factoring the RSA modulus N in the certificate of the web administration interface.

Understanding CVE-2022-34746

This section will delve into the details of the CVE-2022-34746 vulnerability.

What is CVE-2022-34746?

The CVE-2022-34746 vulnerability is a result of improper randomness sources with low entropy used for RSA key pair generation in Zyxel GS1900 series firmware versions prior to V2.70.

The Impact of CVE-2022-34746

The impact of this vulnerability is rated as medium severity with a CVSS base score of 5.9. It poses a high confidentiality impact, allowing attackers to potentially retrieve private keys.

Technical Details of CVE-2022-34746

This section will provide more technical insights into the CVE-2022-34746 vulnerability.

Vulnerability Description

The vulnerability arises from the insufficient entropy in the RSA key pair generation process, making it possible for an attacker to factor the RSA modulus N and access private keys.

Affected Systems and Versions

Zyxel GS1900 series firmware versions prior to V2.70 are affected by this vulnerability.

Exploitation Mechanism

An unauthenticated attacker can exploit the vulnerability by leveraging the improper random sources with low entropy to retrieve private keys.

Mitigation and Prevention

To address and mitigate the CVE-2022-34746 vulnerability, consider the following steps:

Immediate Steps to Take

Upgrade to the patched version V2.70 or later provided by Zyxel.
Ensure network access control and monitoring to detect and prevent unauthorized access.

Long-Term Security Practices

Regularly update firmware and security patches to prevent future vulnerabilities.
Implement strong cryptographic practices and ensure proper entropy sources in key pair generation.

Patching and Updates

Stay informed about security advisories from Zyxel and promptly apply patches to secure your systems against known vulnerabilities.