Summary

• A vulnerability in the Interactive Voice Response (IVR) management connection interface for Cisco Unified Customer Voice Portal (CVP) could allow an unauthenticated, remote attacker to cause the IVR connection to disconnect, creating a system-wide denial of service (DoS) condition.
  
  The vulnerability is due to improper handling of a TCP connection request when the IVR connection is already established. An attacker could exploit this vulnerability by initiating a crafted connection to the IP address of the targeted CVP device. An exploit could allow the attacker to disconnect the IVR to CVP connection, creating a DoS condition that prevents the CVP from accepting new, incoming calls while the IVR automatically attempts to re-establish the connection to the CVP.
  
  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-20180221-cvp

Affected Products

• Vulnerable Products

  This vulnerability affects Cisco Unified Customer Voice Portal (CVP) Software Release 11.5(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.

Indicators of Compromise

• The following messages in the system log file could be an indicator that the vulnerability has been exploited:
  
  

  %CVP_11_5_ICM-3-LOGMSG_ICM_SS_GENERAL_INFO: new VRU PIM connection SYN RemoteAddress=x.x.x.x,RemotePort=aaaa, LocalAddress=y.y.y.y,LocalPort=bbbb
  
  %CVP_11_5_ICM-3-LOGMSG_ICM_SS_PIM_SHUTDOWN: VRU PIM connection removed:RemoteAddress=x.x.x.x,RemotePort=aaaa, LocalAddress=y.y.y.y,LocalPort=bbbb
  

  
  If these messages are present in the system log file, contact the Cisco Technical Assistance Center (TAC) to review the system log file and determine whether the device has been compromised by exploitation of this vulnerability.

Workarounds

• There are no workarounds that address this vulnerability.

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: https://www.cisco.com/c/en/us/products/end-user-license-agreement.html

  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 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.

  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: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

  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.

  Fixed Releases

  This vulnerability is fixed in Cisco Unified Customer Voice Portal Software Release 11.6(1) or later. The software can be downloaded from the Software Center on Cisco.com by navigating to
  Products > Customer Collaboration > Options for Contact Center Solutions > Unified Customer Voice Portal > Cisco Customer Voice Portal Software Releases-11.6(1).
  
  Cisco Unified Customer Voice Portal Software Release 11.5(1) Engineering Special (ES)12 also contains a fix for this vulnerability. The software is available from the Software Center on Cisco.com: Cisco Unified Customer Voice Portal Software Release 11.5(1)_ES12

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 the resolution of a Cisco TAC support case.

URL

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180221-cvp

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	—	Final	2018-February-21

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