Description

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.

Affected Products 1

References 5

• securityfocus.com http://www.securityfocus.com/bid/101567
  Third Party AdvisoryVDB Entry
• sec.cloudapps.cisco.com https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-umbrella-tunnel-gJw5thgE
  Vendor Advisory
• support.umbrella.com https://support.umbrella.com/hc/en-us/articles/115004154423
  Third Party Advisory
• support.umbrella.com https://support.umbrella.com/hc/en-us/articles/115004752143-Virtual-Appliance-Vulnerability-due-to-always-on-SSH-Tunnel-RESOLVED-2017-09-15
  Third Party Advisory
• info-sec.ca https://www.info-sec.ca/advisories/Cisco-Umbrella.html
  Third Party Advisory

Remediation