Number: AL23-009
Date: July 21, 2023
Audience
This Alert is intended for IT professionals and managers of notified organizations.
Purpose
An Alert is used to raise awareness of a recently identified cyber threat that may impact cyber information assets, and to provide additional detection and mitigation advice to recipients. The Canadian Centre for Cyber Security ("Cyber Centre") is also available to provide additional assistance regarding the content of this Alert to recipients as requested.
Details
On July 18, 2023, the Cyber Centre published AV23-416Footnote 1 highlighting multiple vulnerabilities in NetScaler (formally Citrix) Application Delivery Controller (ADC) and NetScaler Gateway appliances. The advisory raised awareness that vulnerabilities existed and that one had been exploited.
On July 20, 2023, the Cybersecurity and Infrastructure Security Agency (CISA) published a Cybersecurity Advisory (CSA)Footnote 2 in response to cyber threat actors exploiting CVE-2023-3519, an unauthenticated remote code execution vulnerability affecting NetScaler Application Delivery Controllers (ADC) and NetScaler Gateways.
The Cybersecurity Advisory (CSA) provides awareness of exploitation, technical details of the exploit activity, tactics, techniques, and procedures (TTPs) used by threat actors, detection methods and mitigations. Additional guidance is available in the Cyber Centre’s Top 10 IT security actions to protect Internet connected networks and information (ITSM.00.089)Footnote 3. These publications are based on analysis of cyber threat trends to help minimize intrusions or the impacts of a successful cyber intrusion.
Should activity matching the content of this alert be discovered, recipients are encouraged to report via the My Cyber Portal, or email contact@cyber.gc.ca.