CVE-2023-27992 : Vulnerability Insights and Analysis

This CVE-2023-27992 was published on June 19, 2023, and is associated with Zyxel as the assigner organization. The vulnerability involves pre-authentication command injection in Zyxel NAS products.

Understanding CVE-2023-27992

This vulnerability pertains to command injection in Zyxel NAS products, including NAS326, NAS540, and NAS542 firmware versions before specific releases.

What is CVE-2023-27992?

The CVE-2023-27992 vulnerability is a pre-authentication command injection flaw found in Zyxel NAS326, NAS540, and NAS542 firmware versions prior to certain designated releases. This vulnerability could be exploited by an unauthenticated attacker to remotely execute operating system commands via a crafted HTTP request.

The Impact of CVE-2023-27992

The impact of CVE-2023-27992 is categorized as critical. With a CVSS v3.1 base score of 9.8, the vulnerability poses a high risk to confidentiality, integrity, and availability. Attack complexity is low, and no privileges are needed for exploitation.

Technical Details of CVE-2023-27992

This section delves into the specifics of the CVE's technical aspects.

Vulnerability Description

The vulnerability stems from improper neutralization of special elements used in an OS command (OS command injection), categorized under CWE-78. This allows attackers to execute OS commands without authentication.

Affected Systems and Versions

The affected Zyxel NAS products include:

NAS326 firmware versions prior to V5.21(AAZF.14)C0
NAS540 firmware versions prior to V5.21(AATB.11)C0
NAS542 firmware versions prior to V5.21(ABAG.11)C0

Exploitation Mechanism

Exploitation of this vulnerability can be carried out remotely by sending a specifically crafted HTTP request by an unauthorized user.

Mitigation and Prevention

To address CVE-2023-27992, it is crucial to take immediate steps for containment and implement long-term security practices.

Immediate Steps to Take

Organizations using the affected Zyxel NAS products should ensure system updates are promptly applied.
Network security measures should be bolstered to mitigate external threats.

Long-Term Security Practices

Regular security assessments and audits can help identify vulnerabilities proactively.
Implementing network segmentation and access controls can limit the impact of potential attacks.

Patching and Updates

Zyxel has likely released patches for the impacted firmware versions. It is highly recommended to apply the latest security updates provided by Zyxel to safeguard against CVE-2023-27992.