An authorisation bypass vulnerability was discovered in the Citrix Application Delivery Management (ADM) server. The vulnerability allows a Citrix ADM user with read-only privilege to access a managed instances with admin level permissions.

The following deployment scenarios are affected:

1. A Citrix Application Delivery Management server on-premises

2. A Citrix Application Delivery Management on Cloud, deployed on-premises or customer-managed cloud datacenters.

This vulnerability has been assigned the following CVE number:

• CVE-2019-17366:  Improper Access Control in Citrix Application Delivery Management Server.

This vulnerability affects the following product versions:

· Citrix Application Delivery Management version 12.0

· Citrix Application Delivery Management version 12.1 earlier than build 54.13

· Citrix Application Delivery Management Cloud version 13.0 earlier than build 41.20

This vulnerability has been addressed in the following version of Citrix Application Delivery Management:

• Citrix Application Delivery Management version 12.1 build 54.13 and later
• Citrix Application Delivery Management Cloud version 13.0 build 41.20 and later

Citrix has already updated all Citrix ADM deployed on Citrix Cloud to the latest version.

Customers running Citrix Application Delivery Management 12.0 should upgrade to a supported version.

Citrix recommends that customers affected by this vulnerability upgrade to a version of the Citrix Application Delivery Management that contains a fix for this issue as soon as normal patching schedule allows.

The latest on-premises version is available on the Citrix website at the following address:
https://www.citrix.com/downloads/citrix-application-management