Cisco Security Advisory
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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
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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 condition.
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180117-cvp
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Vulnerable Products
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
Version 11.5(1)Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
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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.
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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:
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.htmlAdditionally, 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 solution.
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:
http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.htmlCustomers 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.
Fixed Releases
In the following table, the first column lists major releases of Cisco Unified CVP Software and the second column indicates the recommended release to install to address this vulnerability.
Customers should upgrade to an appropriate release as indicated in the following table:Cisco Unified CVP Major Release Fixed Release for Cisco Bug CSCve85840 10.5 Affected; migrate to 11.6 11.0 Affected; migrate to 11.6 11.5 Affected; migrate to 11.6 11.6 Not affected
Customers with active service contracts can download fixed software for major releases from the Software Center on Cisco.com by navigating to Downloads Home > Products > Customer Collaboration > Options for Contact Center Solutions > Unified Customer Voice Portal.
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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.
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This vulnerability was found during the resolution of a Cisco TAC support case.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.1 Added fixed software table. Fixed Software Final 2018-February-15 1.0 Initial public release. — Final 2018-January-17
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