Overview
Recently, NSFOCUS CERT detected a sensitive information disclosure vulnerability in Citrix NetScaler ADC and Gateway (CVE-2023-4966). When the device is configured as a gateway (VPN virtual server, ICA proxy, CVPN, RDP proxy) or AAA virtual server, unauthorized remote attackers can exploit this vulnerability to access sensitive information and cause information leakage. The CVSS score is 9.4, and the details of this vulnerability and PoC have been made public, and there are exploits in wild. Affected users should take protective measures.
Reference link: https://support.citrix.com/article/CTX579459/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20234966-and-cve20234967
Scope of Impact
Affected version
- NetScaler ADC and NetScaler Gateway 14.1<14.1-8.50
- NetScaler ADC and NetScaler Gateway 13.1<13.1-49.15
- NetScaler ADC and NetScaler Gateway 13.0<13.0-92.19
- NetScaler ADC 13.1-FIPS<13.1-37.164
- NetScaler ADC 12.1-FIPS<12.1-55.300
- NetScaler ADC 12.1-NDcPP<12.1-55.300
Note: NetScaler ADC and NetScaler Gateway version 12.1 are also susceptible, but this version is now no longer supported.
Unaffected version
- NetScaler ADC and NetScaler Gateway>=14.1-8.50
- NetScaler ADC and NetScaler Gateway 13.1>=13.1-49.15
- NetScaler ADC and NetScaler Gateway 13.0>=13.0-92.19
- NetScaler ADC 13.1-FIPS>=13.1-37.164
- NetScaler ADC 12.1-FIPS>=12.1-55.300
- NetScaler ADC 12.1-NDcPP>=12.1-55.300
Mitigation
Currently, the official security version has been released to fix this vulnerability. It is recommended that affected users upgrade their protection setting in a timely manner:
https://www.citrix.com/downloads/citrix-adc/
https://www.citrix.com/downloads/citrix-gateway/
Statement
This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.
About NSFOCUS
NSFOCUS, Inc., a global network and cyber security leader, protects enterprises and carriers from advanced cyber attacks. The company’s Intelligent Hybrid Security strategy utilizes both cloud and on-premises security platforms, built on a foundation of real-time global threat intelligence, to provide multi-layered, unified and dynamic protection against advanced cyber attacks.
NSFOCUS works with Fortune Global 500 companies, including four of the world’s five largest financial institutions, organizations in insurance, retail, healthcare, critical infrastructure industries as well as government agencies. NSFOCUS has technology and channel partners in more than 60 countries, is a member of both the Microsoft Active Protections Program (MAPP), and the Cloud Security Alliance (CSA).
A wholly owned subsidiary of NSFOCUS Technologies Group Co., Ltd., the company has operations in the Americas, Europe, the Middle East and Asia Pacific.
