CVE-2023-5347 : Vulnerability Insights and Analysis

An Unauthenticated Firmware Upgrade vulnerability, identified as CVE-2023-5347, was published by CyberDanube on January 9, 2024. This vulnerability affects the Korenix JetNet Series devices running firmware older than version 2024/01.

Understanding CVE-2023-5347

This section dives deeper into the specifics of CVE-2023-5347.

What is CVE-2023-5347?

The CVE-2023-5347 vulnerability is classified as an Improper Verification of Cryptographic Signature issue in the update process of Korenix JetNet Series devices. It allows an attacker to replace the entire operating system, including Trusted Executables.

The Impact of CVE-2023-5347

The impact of this vulnerability is critical. It can lead to a high confidentiality and high integrity impact, with a CVSS base score of 9.8. Attackers can exploit this vulnerability remotely with a low attack complexity, potentially leading to the installation of rootkits, replacement of binaries, and compromised system integrity.

Technical Details of CVE-2023-5347

This section outlines the technical details of CVE-2023-5347.

Vulnerability Description

The vulnerability arises from an improper verification of cryptographic signatures in the firmware upgrade process, allowing unauthorized parties to install malicious software on the device.

Affected Systems and Versions

Korenix JetNet Series devices running firmware versions older than 2024/01 are susceptible to this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted requests to the device, tricking it into accepting and executing malicious firmware upgrades.

Mitigation and Prevention

Understanding how to mitigate and prevent the exploitation of CVE-2023-5347 is crucial for maintaining the security of affected systems.

Immediate Steps to Take

Implementing network segmentation, restricting access to the update mechanism, and regularly monitoring for unauthorized firmware changes can help mitigate immediate risks.

Long-Term Security Practices

Regular security audits, keeping firmware updated with the latest patches, and educating users about the risks of unauthorized firmware upgrades are essential for long-term security.

Patching and Updates

Vendor-released patches that address the vulnerability should be promptly applied to all affected Korenix JetNet Series devices to prevent exploitation.

By following these mitigation and prevention strategies, organizations can enhance the security posture of their systems and protect against the Unauthenticated Firmware Upgrade vulnerability (CVE-2023-5347).