A vulnerability in the admin web interface could allow an authenticated attacker to upload a custom template to perform an arbitrary code execution. These templates can be used to display customised login and meeting pages and are rendered using the Perl Template Toolkit engine. This engine can be coerced into executing code by creating a new "BLOCK" by abusing the "template" global object to create a new block to be evaluated. The deployed agent will run with ROOT privileges.
The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges.
This vulnerability allows for unauthenticated attackers with network access to the iControl REST interface, through the BIG-IP management interface and self IP addresses, to execute arbitrary system commands, create or delete files, and disable services. This vulnerability can only be exploited through the control plane and cannot be exploited through the data plane. Exploitation can lead to complete system compromise. The BIG-IP system in Appliance mode is also vulnerable.