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AUSCERT External Security Bulletin Redistribution
Cisco Meeting Server Session Description Protocol Media
Lines Buffer Overflow Vulnerability
3 November 2016
AusCERT Security Bulletin Summary
Product: Cisco Meeting Server
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
CVE Names: CVE-2016-6448
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Cisco Security Advisory
Cisco Meeting Server Session Description Protocol Media Lines Buffer Overflow
Advisory ID: cisco-sa-20161102-cms1
First Published: 2016 November 2 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
Base 7.5, Temporal 6.8
A vulnerability in the Session Description Protocol (SDP) parser of Cisco
Meeting Server could allow an unauthenticated, remote attacker to execute
arbitrary code on an affected system.
The vulnerability exists because the affected software performs incomplete
input validation of the size of media lines in session descriptions. An
attacker could exploit this vulnerability by sending crafted packets to the
SDP parser on an affected system. A successful exploit could allow the
attacker to cause a buffer overflow condition on an affected system, which
could allow the attacker to execute arbitrary code on the system.
Cisco has released software updates that address this vulnerability. There are
no workarounds that address this vulnerability.
This advisory is available at the following link:
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 hardware providers to allow a
seamless meeting architecture. This capability exists via collaboration
between Cisco and Acano, who joined Cisco in early 2016.
This vulnerability affects the following products:
Cisco Meeting Server releases prior to Release 2.0.3
Acano Server releases 1.9.x prior to Release 1.9.5
Acano Server releases 1.8.x prior to Release 1.8.17
For more information about this vulnerability in Acano Server releases 1.8.x
and 1.9.x, see the following resources on the Acano website: Acano Server & VM
Release 1.8.17 Release Notes and Acano Server & VM Release 1.9.5 Release Notes
To determine whether a system is affected by this vulnerability,
administrators can check the system configuration by using the Cisco Meeting
Server command-line interface (CLI). To determine which release of Cisco
Meeting Server is running on a system, administrators can issue the version
command in the CLI and refer to the output of the command.
The following example shows the output of the version command for a system
that is running Cisco Meeting Server Release 2.0.6:
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
There are no workarounds that address this vulnerability.
Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support for
software versions and feature sets for which they have purchased a license. By
installing, downloading, accessing, or otherwise using such software upgrades,
customers agree to follow the terms of the Cisco software license:
Additionally, customers may only download software for which they have a valid
license, procured from Cisco directly, or through a Cisco authorized reseller
or partner. In most cases this will be a maintenance upgrade to software that
was previously purchased. Free security software updates do not entitle
customers to a new software license, additional software feature sets, or
major revision upgrades.
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.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but are
unsuccessful in obtaining fixed software through their point of sale should
obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):
Customers should have the product serial number available and be prepared to
provide the URL of this advisory as evidence of entitlement to a free upgrade.
This vulnerability has been fixed in the following releases:
Cisco Meeting Server Release 2.0.3
Acano Server Release 1.9.5
Acano Server Release 1.8.17
Customers are advised to download the latest Cisco Meeting Server release from
the Software Center on Cisco.com by navigating to Products > Conferencing >
Video Conferencing > Multiparty Conferencing > Meeting Server > Meeting Server
1000 > TelePresence Software.
Customers can download Acano Server Release 1.9.5 and Acano Server Release
1.8.17 from the FTP library on the Acano website.
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.
Version Description Section Status Date
1.0 Initial public release. Final 2016-November-02
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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