Citrix ShareFile

Citrix ShareFile before 19.12 allows User Enumeration. It is possible to enumerate application username based on different server responses using the request to check the otp code. No authentication is required.

Citrix ShareFile before 19.23 allows a downgrade from two-factor authentication to one-factor authentication. An attacker with access to the offline victim's otp physical token or virtual app (like google authenticator) is able to bypass the first authentication phase (username/password mechanism) and log-in using username/otp combination only (phase 2 of 2FA).