CVE-2023-4966 Scanner

Citrix NetScaler ADC and NetScaler Gateway are critical networking tools used for application delivery and secure remote access. NetScaler ADC optimizes web and mobile app performance, while NetScaler Gateway provides VPN and proxy services for remote workers. These products are widely deployed in enterprise environments to ensure reliable and secure connectivity.

CVE-2023-4966 is an information disclosure vulnerability that arises due to improper handling of sensitive data in specific virtual server configurations. When the Gateway or AAA virtual server is misconfigured, it can inadvertently expose confidential information such as usernames and passwords. This flaw stems from insufficient access controls or data sanitization in the affected components.

Technically, the vulnerability is triggered through crafted requests to the Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server endpoints. Attackers can exploit this by sending specially formatted queries that cause the server to return sensitive data in the response. The issue lies in how these endpoints process and output authentication-related information without proper validation.

If exploited, this vulnerability can lead to unauthorized access to corporate networks and sensitive data. Attackers can use disclosed credentials to bypass authentication, infiltrate systems, and perform data exfiltration or lateral movement. The impact is severe, potentially compromising entire network infrastructures and causing significant operational and reputational damage.