CVE-2023-37928 : Security Advisory and Response
Learn about CVE-2023-37928, a high-severity command injection vulnerability in Zyxel NAS326 and NAS542 firmware versions V5.21(AAZF.14)C0 and V5.21(ABAG.11)C0. Understand the impact, affected systems, exploitation, and mitigation steps.
A post-authentication command injection vulnerability in the WSGI server of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version V5.21(ABAG.11)C0 has been identified. This vulnerability could allow an authenticated attacker to execute operating system commands through a crafted URL.
Understanding CVE-2023-37928
This section provides detailed insights into the CVE-2023-37928 vulnerability.
What is CVE-2023-37928?
The CVE-2023-37928 vulnerability is a post-authentication command injection flaw in the Zyxel NAS326 and NAS542 firmware versions mentioned. It allows authenticated attackers to run OS commands on the affected device.
The Impact of CVE-2023-37928
The impact of this vulnerability is rated as high, with a CVSS v3.1 base score of 8.8. It could result in confidentiality, integrity, and availability impacts, posing a significant risk to affected systems.
Technical Details of CVE-2023-37928
This section delves into the technical aspects of CVE-2023-37928.
Vulnerability Description
The vulnerability arises from improper neutralization of special elements used in an OS command ('OS Command Injection'). Attackers exploit this flaw post-authentication, executing malicious commands via a crafted URL.
Affected Systems and Versions
Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version V5.21(ABAG.11)C0 are confirmed to be affected by this vulnerability.
Exploitation Mechanism
The vulnerability allows authenticated attackers to send specially crafted URLs to the WSGI server, leading to the execution of unauthorized OS commands.
Mitigation and Prevention
Protecting systems from CVE-2023-37928 requires proactive measures and immediate actions.
Immediate Steps to Take
Users are advised to apply security patches provided by Zyxel promptly. Additionally, network segregation and restricting access to vulnerable devices can help mitigate risks.
Long-Term Security Practices
Implementing stringent access controls, regular security audits, and keeping systems updated with the latest firmware are crucial for long-term security.
Patching and Updates
Stay informed about security advisories from Zyxel and ensure timely installation of patches and updates to address known vulnerabilities.