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AUSCERT External Security Bulletin Redistribution
Cisco Unified Customer Voice Portal Denial of Service Vulnerability
18 January 2018
AusCERT Security Bulletin Summary
Product: Cisco Unified Customer Voice Portal
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-0086
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Cisco Security Advisory
Cisco Unified Customer Voice Portal Denial of Service Vulnerability
Advisory ID: cisco-sa-20180117-cvp
First Published: 2018 January 17 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
Base 8.6 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
A vulnerability in the application server of the Cisco Unified Customer Voice
Portal (CVP) could allow an unauthenticated, remote attacker to cause a denial
of service (DoS) condition on the affected device.
The vulnerability is due to malformed SIP INVITE traffic received on the CVP
during communications with the Cisco Virtualized Voice Browser (VVB). An
attacker could exploit this vulnerability by sending malformed SIP INVITE
traffic to the targeted appliance. An exploit could allow the attacker to
impact the availability of services and data on the device, causing a DoS
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:
This vulnerability affects Cisco Unified CVP running any software release
prior to 11.6(1).
To determine which release of Cisco Unified CVP software is running,
administrators can use a web browser to connect to the Cisco Unified CVP
client via HTTPS. The release number appears on the software home page. The
following is an example of the text that may appear on the home page:
Cisco Unified Customer Voice Portal
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
There are no workarounds that address this vulnerability; however, there are
ways to mitigate this vulnerability.
1) Ensure the Cisco UCCE (Unified Contact Center Enterprise) infrastructure is
configured to only allow incoming SIP traffic from trusted IP addresses.
2) Ensure third-party gateway(s) residing between the CVP & ISP are enabled
for content filtering to drop packets containing malformed SIP headers or
malicious inputs. Fixed Software
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 upgrade 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 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 is fixed in Cisco Unified CVP software release 11.6(1) or
later. The software can be downloaded from the Software Center on Cisco.com by
navigating to Downloads Home > Products > Customer Collaboration > Options for
Contact Center Solutions > Unified Customer Voice Portal.
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 the resolution of a Cisco TAC support
Version Description Section Status Date
1.0 Initial public release. Final 2018-January-17
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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