CVE-2017-6679
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
Cisco Umbrella Virtual Appliance Version 2.0.3 and prior contained an undocumented encrypted remote support tunnel (SSH) that auto-initiated from the customer's appliance to Cisco's SSH Hubs. This tunnel allowed authorized personnel from the Cisco Umbrella team to access the appliance remotely without explicit customer approval.
Risk Assessment
Lack of control over access to the appliance could lead to unauthorized takeover, posing a serious threat to the organization's data security.
Recommendation
It is recommended to upgrade to version 2.1.0 or later to require explicit customer approval before establishing an SSH tunnel.
Original NVD description (English source)
The Cisco Umbrella Virtual Appliance Version 2.0.3 and prior contained an undocumented encrypted remote support tunnel (SSH) which auto initiated from the customer's appliance to Cisco's SSH Hubs in the Umbrella datacenters. These tunnels were primarily leveraged for remote support and allowed for authorized/authenticated personnel from the Cisco Umbrella team to access the appliance remotely and obtain full control without explicit customer approval. To address this vulnerability, the Umbrella Virtual Appliance version 2.1.0 now requires explicit customer approval before an SSH tunnel from the VA to the Cisco terminating server can be established.