Citrix NetScaler ADC and NetScaler Gateway CVE-2019-18225 Authentication Bypass Vulnerability

Description

Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway are prone to an authentication-bypass vulnerability. An attacker can exploit this issue to bypass the authentication mechanism. This may aid in further attacks. The following Citrix products are affected: Citrix NetScaler ADC and NetScaler Gateway version 13.0 Build 41.20 and prior are vulnerable Citrix NetScaler ADC and NetScaler Gateway version 12.1 Build 54.13 and prior are vulnerable Citrix NetScaler ADC and NetScaler Gateway version 12.0 Build 62.8 and prior are vulnerable Citrix NetScaler ADC and NetScaler Gateway version 11.1 Build 62.8 and prior are vulnerable Citrix NetScaler ADC and NetScaler Gateway version 10.5 Build 70.5 and prior are vulnerable

Technologies Affected

• Citrix NetScaler ADC 10.5
• Citrix NetScaler ADC 10.5 Build 58.11
• Citrix NetScaler ADC 10.5 Build 59.13
• Citrix NetScaler ADC 10.5 Build 60.7010.e
• Citrix NetScaler ADC 10.5 Build 61.11
• Citrix NetScaler ADC 10.5 Build 66.9
• Citrix NetScaler ADC 10.5 Build 70.5
• Citrix NetScaler ADC 10.5 build 67.13
• Citrix NetScaler ADC 11.1
• Citrix NetScaler ADC 11.1 Build 47.14
• Citrix NetScaler ADC 11.1 Build 51.21
• Citrix NetScaler ADC 11.1 Build 52.13
• Citrix NetScaler ADC 11.1 Build 55.13
• Citrix NetScaler ADC 11.1 Build 62.8
• Citrix NetScaler ADC 11.1 build 51.26
• Citrix NetScaler ADC 11.1 build 53.11
• Citrix NetScaler ADC 11.1 build 54.14
• Citrix NetScaler ADC 11.1 build 54.16
• Citrix NetScaler ADC 11.1 build 55.10
• Citrix NetScaler ADC 11.1 build 56.19
• Citrix NetScaler ADC 12.0
• Citrix NetScaler ADC 12.0 Build 41.24
• Citrix NetScaler ADC 12.0 Build 53.13
• Citrix NetScaler ADC 12.0 Build 62.8
• Citrix NetScaler ADC 12.0 build 41.16
• Citrix NetScaler ADC 12.0 build 41.22
• Citrix NetScaler ADC 12.0 build 51.24
• Citrix NetScaler ADC 12.0 build 53.22
• Citrix NetScaler ADC 12.0 build 53.6
• Citrix NetScaler ADC 12.1 Build 54.13
• Citrix NetScaler ADC 13.0 Build 41.20

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of suspicious or anomalous activity. This may help detect malicious actions that an attacker may take after successfully exploiting vulnerabilities in applications. Review logs regularly.

Updates are available. Please see the references or vendor advisory for more information.