CVE-2023-22919 : Exploit Details and Defense Strategies

This CVE record was published on May 1, 2023, by Zyxel. The vulnerability identified as CVE-2023-22919 is a post-authentication command injection vulnerability found in the Zyxel NBG6604 firmware version V1.01(ABIR.0)C0. This vulnerability could potentially allow an authenticated attacker to remotely execute certain operating system commands by sending a specifically crafted HTTP request.

Understanding CVE-2023-22919

This section will delve into the specifics of CVE-2023-22919 and its implications.

What is CVE-2023-22919?

CVE-2023-22919 is a post-authentication command injection vulnerability discovered in the Zyxel NBG6604 firmware version V1.01(ABIR.0)C0. The vulnerability could be exploited by an authenticated attacker to run arbitrary OS commands remotely through a manipulated HTTP request.

The Impact of CVE-2023-22919

With a CVSS v3.1 base score of 8.8, this vulnerability has been rated as high severity. The impact includes potential unauthorized execution of commands with elevated privileges, leading to significant confidentiality, integrity, and availability risks to the affected system.

Technical Details of CVE-2023-22919

In this section, we will explore the technical aspects of CVE-2023-22919, including the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

CVE-2023-22919 is classified under CWE-78, which pertains to the improper neutralization of special elements used in an OS command (OS Command Injection). This vulnerability allows attackers to inject and execute malicious OS commands post-authentication.

Affected Systems and Versions

The vulnerability impacts Zyxel NBG6604 firmware version V1.01(ABIR.0)C0. Systems running this specific firmware version are vulnerable to exploitation.

Exploitation Mechanism

By sending a carefully crafted HTTP request, authenticated attackers can leverage the vulnerability to execute unauthorized OS commands on the affected system remotely.

Mitigation and Prevention

To address CVE-2023-22919 and enhance overall security, it is crucial to implement effective mitigation strategies and preventive measures.

Immediate Steps to Take

Ensure timely patching and updates for the affected Zyxel NBG6604 firmware version.
Monitor network traffic for any suspicious HTTP requests that could indicate exploitation attempts.
Restrict access to vulnerable systems and apply the principle of least privilege to minimize potential impact.

Long-Term Security Practices

Conduct regular security audits and vulnerability assessments to proactively identify and address potential weaknesses.
Educate users and administrators on secure authentication practices and the risks associated with command injection vulnerabilities.
Implement network segmentation and robust access controls to limit the attack surface and contain potential threats.

Patching and Updates

Zyxel has likely released patches or firmware updates to address CVE-2023-22919. It is recommended to promptly apply these security updates to mitigate the vulnerability and strengthen the security posture of the affected systems.