CVE-2017-6679

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Summary

CVECVE-2017-6679
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-12-01 17:29:00 UTC
Updated2026-06-22 13:52:20 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Problem Types: NVD-CWE-noinfo | undocumented encrypted remote support tunnel

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.4MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary6AV:L/AC:H/Au:S/C:C/I:C/A:C

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
High
Authentication
Single
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:L/AC:H/Au:S/C:C/I:C/A:C

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Cisco Umbrella Virtual Appliance All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Cisco Umbrella Virtual Appliance Version 2.0.3 And Prior affected Cisco Umbrella Virtual Appliance Version 2.0.3 and prior Not specified

References

ReferenceSourceLinkTags
Cisco Umbrella Virtual Appliance Undocumented Support Tunnel Vulnerability af854a3a-2127-422b-91ae-364da2661108 sec.cloudapps.cisco.com Vendor Advisory
Virtual Appliance – Vulnerability due to always-on SSH Tunnel – RESOLVED – 2017-09-15 – Cisco Umbrella af854a3a-2127-422b-91ae-364da2661108 support.umbrella.com Third Party Advisory
Cisco Umbrella Virtual Appliance CVE-2017-6679 Unauthorized Access Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
Cisco Umbrella Virtual Appliance - Undocumented Support Tunnel (CVE-2017-6679) - Info-Sec.CA af854a3a-2127-422b-91ae-364da2661108 www.info-sec.ca Third Party Advisory
On-Demand Tech Support SSH Tunnel for Virtual Appliances – Cisco Umbrella af854a3a-2127-422b-91ae-364da2661108 support.umbrella.com Third Party Advisory
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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