ESB-2017.2142 - [Virtual][Cisco] Cisco Meeting Server: Root compromise - Existing account 2017-08-28

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2142
           Cisco Meeting Server Command Injection and Privilege
                         Escalation Vulnerability
                              28 August 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Meeting Server
Publisher:         Cisco Systems
Operating System:  Virtualisation
                   Cisco
Impact/Access:     Root Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-6794  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170823-cms

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Cisco Security Advisory

Cisco Meeting Server Command Injection and Privilege Escalation Vulnerability

Medium

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:

CSCvf53830

CVSS Score:

Base 6.7

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

CVE-2017-6794

CWE-20

Summary

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 
to root.

There are no workarounds that address this vulnerability.

This advisory is available at the following link:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170823-cms

Affected Products

Vulnerable Products

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 
version 2.0.6:

system> version

    2_0_6

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by this 
vulnerability.

Details

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.

Workarounds

There are no workarounds that address this vulnerability.

Fixed Software

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 
solution.

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.

Source

This vulnerability was found during internal security testing.

URL

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170823-cms

Revision History

Version 	Description 		Section 	Status 		Date

1.0 		Initial public release. 		Final 		2017-August-23

LEGAL DISCLAIMER

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF 
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
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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