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AUSCERT External Security Bulletin Redistribution
Cisco Meeting Server Command Injection and Privilege
28 August 2017
AusCERT Security Bulletin Summary
Product: Cisco Meeting Server
Publisher: Cisco Systems
Operating System: Virtualisation
Impact/Access: Root Compromise -- Existing Account
CVE Names: CVE-2017-6794
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Cisco Security Advisory
Cisco Meeting Server Command Injection and Privilege Escalation Vulnerability
Advisory ID: cisco-sa-20170823-cms
First Published: 2017 August 23 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
Base 6.7 CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
A vulnerability in the CLI command-parsing code of Cisco Meeting Server could
allow an authenticated, local attacker to perform command injection and
escalate their privileges to root. The attacker must first authenticate to the
application with valid administrator credentials.
The vulnerability is due to insufficient validation of user-supplied input at
the CLI for certain commands. An attacker could exploit this vulnerability by
authenticating to the affected application and submitting a crafted CLI
command for execution at the Cisco Meeting Server CLI. An exploit could allow
the attacker to perform command injection and escalate their privilege level
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
This vulnerability exists in Cisco Meeting Server software versions prior to
and including 2.0, 2.1, and 2.2.
Administrators can check the system configuration from the CLI of Cisco
Meeting Server to determine if a device is affected. An administrator can
determine the software version by using the version command. In this example,
the following command output shows the version of a device running software
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
Cisco Meeting Server incorporates video, audio, and content-sharing
capabilities into software that can be accessed via a conference room,
desktop, or mobile device. Cisco Meeting Server works across Cisco video rooms
and connects with Skype for Business and other providers to enable a seamless
meeting architecture. This capability exists via collaboration between Cisco
and Acano, which was acquired by Cisco in 2016.
There are no workarounds that address this vulnerability.
For information about fixed software releases, consult the Cisco bug ID(s) at
the top of this advisory.
When considering software upgrades, customers are advised to regularly consult
the advisories for Cisco products, which are available from the Cisco Security
Advisories and Alerts page, to determine exposure and a complete upgrade
In all cases, customers should ensure that the devices to be upgraded contain
sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release. If
the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance providers.
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any
public announcements or malicious use of the vulnerability that is described
in this advisory.
This vulnerability was found during internal security testing.
Version Description Section Status Date
1.0 Initial public release. Final 2017-August-23
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
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FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS
LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO
CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information or
contain factual errors. The information in this document is intended for end
users of Cisco products.
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