CVE-2023-33239 : Exploit Details and Defense Strategies

A detailed overview of the Second Order Command-injection Vulnerability in the Key-generation Function affecting multiple Moxa products.

Understanding CVE-2023-33239

This section provides insights into the vulnerability, its impact, technical details, and mitigation strategies.

What is CVE-2023-33239?

The CVE-2023-33239 vulnerability refers to a Second Order Command-injection vulnerability found in the key-generation function of various Moxa products. Specifically, TN-4900 Series firmware versions v1.2.4 and prior, as well as TN-5900 Series firmware versions v3.3 and prior, are susceptible to this exploit due to inadequate input validation. This flaw could potentially enable unauthorized users to execute malicious code remotely on compromised devices.

The Impact of CVE-2023-33239

The impact of CVE-2023-33239 is classified as high, with a CVSS v3.1 base score of 8.8, indicating significant risks to confidentiality, integrity, and availability of affected systems. The vulnerability falls under CAPEC-248 (Command Injection) and poses a serious security threat.

Technical Details of CVE-2023-33239

Diving into the specifics of the CVE-2023-33239 vulnerability, including its description, affected systems, exploitation mechanism, and remediation steps.

Vulnerability Description

The vulnerability arises from a Second Order Command-injection issue in the key-generation function of TN-4900 Series and TN-5900 Series firmware, allowing potential remote code execution by malicious actors.

Affected Systems and Versions

Moxa products such as TN-4900 Series, TN-5900 Series, EDR-810 Series, EDR-G902 Series, EDR-G903 Series, EDR-G9010 Series, and NAT-102 Series are impacted by CVE-2023-33239 due to specific firmware versions.

Exploitation Mechanism

Exploiting this vulnerability requires sending crafted inputs to the key-generation function, enabling attackers to execute unauthorized commands on vulnerable devices remotely.

Mitigation and Prevention

Guidance on immediate steps to take, long-term security practices, and patching procedures to mitigate the risks associated with CVE-2023-33239.

Immediate Steps to Take

Users of affected Moxa products are advised to apply the relevant vendor-supplied patches immediately to address the Second Order Command-injection vulnerability. Specific firmware upgrade recommendations are provided for each impacted product series.

Long-Term Security Practices

Incorporating secure coding practices, regular security assessments, and timely software updates can enhance the overall security posture of the affected systems to mitigate future vulnerabilities.

Patching and Updates

Moxa has developed patches for the affected products to remediate the CVE-2023-33239 vulnerability. Detailed upgrade instructions for each product series are provided by Moxa to ensure the security of the firmware.