CVE-2023-4967 : Vulnerability Insights and Analysis

This CVE record, assigned by Citrix, details a Denial of Service vulnerability affecting NetScaler ADC and NetScaler Gateway when configured as Gateways or AAA Virtual Servers.

Understanding CVE-2023-4967

This section provides insights into the nature of the CVE-2023-4967 vulnerability and its impact on affected systems.

What is CVE-2023-4967?

CVE-2023-4967 refers to a Denial of Service vulnerability in NetScaler ADC and NetScaler Gateway when utilized as Gateways or AAA Virtual Servers. Attackers can exploit this vulnerability to disrupt the availability of affected services, leading to potential service outages.

The Impact of CVE-2023-4967

The impact of this vulnerability is categorized as HIGH, with a CVSSv3.1 base score of 8.2. It poses a significant risk to affected systems' availability, potentially causing service disruption.

Technical Details of CVE-2023-4967

This section delves into the technical aspects of the CVE-2023-4967 vulnerability, including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability arises due to a Denial of Service issue in NetScaler ADC and NetScaler Gateway when configured as VPN virtual servers, ICA Proxy, CVPN, RDP Proxy, or AAA Virtual Servers. Attackers can exploit this flaw to disrupt the availability of these services.

Affected Systems and Versions

The following versions of NetScaler ADC and NetScaler Gateway are affected by CVE-2023-4967:

NetScaler ADC versions 14.1, 13.1, 13.0, 13.1-FIPS, 12.1-FIPS, and 12.1-NDcPP
NetScaler Gateway versions 14.1, 13.1, and 13.0

Exploitation Mechanism

The vulnerability can be exploited remotely with a low attack complexity, posing a high impact on availability. Attackers do not require any specific privileges or user interaction to launch a successful Denial of Service attack.

Mitigation and Prevention

In this section, we outline the steps that organizations should take to mitigate the risks posed by CVE-2023-4967 and prevent potential exploitation.

Immediate Steps to Take

Organizations should apply patches and updates provided by Citrix to address the vulnerability promptly.
Implement network security controls to detect and block potential exploitation attempts targeting the affected systems.

Long-Term Security Practices

Regularly monitor for security advisories and updates from Citrix to stay informed about emerging threats and vulnerabilities.
Conduct regular security assessments and penetration testing to identify and address any potential weaknesses in the network infrastructure.

Patching and Updates

It is essential for organizations to apply the latest patches and updates released by Citrix for NetScaler ADC and NetScaler Gateway to remediate the CVE-2023-4967 vulnerability and enhance the security posture of the affected systems.