Zero-day vulnerability in Citrix NetScaler Gateway

Code Injection
CVE-2023-6548

Vulnerability details

Advisory: SB2024011635 - Multiple vulnerabilities in Citrix NetScaler ADC and NetScaler Gateway

Vulnerable component: Citrix NetScaler Gateway

CVE-ID: CVE-2023-6548

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:H/RL:O/RC:C

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Description:

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation within the management interface. A remote authenticated user can send a specially crafted request to the application and execute arbitrary code on the target system.

Note, the vulnerability is being actively exploited in the wild.

External links:

https://support.citrix.com/article/CTX584986

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.