Citrix security advisory

Number: AV20-016
Date: 20 January 2020

On 19 January 2020 Citrix released security updates to address a critical vulnerability, tracked as CVE-2019-19781, for the following products:

• NetScaler ADC and NetScaler Gateway version 12.0 all supported builds before 12.0.63.13
• NetScaler ADC and NetScaler Gateway version 11.1 all supported builds before 11.1.63.15

Successful exploitation of this vulnerability may allow an unauthenticated remote actor to perform arbitrary code execution.

The remaining updates for Citrix ADC, Citrix Gateway, and Citrix SD-WAN WANOP are expected to be released before the end of January 2020. Review the below Citrix Advisory for further information.

The Cyber Centre encourages users and administrators to review the following Citrix publications and apply the necessary updates when available:

Citrix Advisory
https://support.citrix.com/article/CTX267027

Mitigation Steps
https://support.citrix.com/article/CTX267679

Note to Readers

The Canadian Centre for Cyber Security (Cyber Centre) operates as part of the Communications Security Establishment.  We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure, Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.

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