Vulnerability Details : CVE-2017-6679
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.
Products affected by CVE-2017-6679
- cpe:2.3:a:cisco:umbrella:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-6679
0.11%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 26 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-6679
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
6.0
|
MEDIUM | AV:L/AC:H/Au:S/C:C/I:C/A:C |
1.5
|
10.0
|
NIST | |
6.4
|
MEDIUM | CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.5
|
5.9
|
NIST |
References for CVE-2017-6679
-
https://support.umbrella.com/hc/en-us/articles/115004752143-Virtual-Appliance-Vulnerability-due-to-always-on-SSH-Tunnel-RESOLVED-2017-09-15
Virtual Appliance – Vulnerability due to always-on SSH Tunnel – RESOLVED – 2017-09-15 – Cisco UmbrellaThird Party Advisory
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https://www.info-sec.ca/advisories/Cisco-Umbrella.html
Third Party Advisory
-
https://support.umbrella.com/hc/en-us/articles/115004154423
On-Demand Tech Support SSH Tunnel for Virtual Appliances – Cisco UmbrellaThird Party Advisory
-
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-umbrella-tunnel-gJw5thgE
Cisco Umbrella Virtual Appliance Undocumented Support Tunnel Vulnerability
-
http://www.securityfocus.com/bid/101567
Cisco Umbrella Virtual Appliance CVE-2017-6679 Unauthorized Access VulnerabilityThird Party Advisory;VDB Entry
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