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AUSCERT External Security Bulletin Redistribution
ESB-2018.0536
Cisco Unified Customer Voice Portal Interactive Voice
Response Connection Denial of Service Vulnerability
23 February 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Unified Customer Voice Portal
Publisher: Cisco Systems
Operating System: Cisco
Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0139
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180221-cvp
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Security Advisory
Cisco Unified Customer Voice Portal Interactive Voice Response Connection
Denial of Service Vulnerability
High
Advisory ID: cisco-sa-20180221-cvp
First Published: 2018 February 21 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCve70560
CVE-2018-0139
CWE-20
CVSS Score: 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
Summary
o 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
o 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
o 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
o There are no workarounds that address this vulnerability.
Fixed Software
o 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
o 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
o This vulnerability was found during the resolution of a Cisco TAC support
case.
Cisco Security Vulnerability Policy
o 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.
Subscribe to Cisco Security Notifications
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20180221-cvp
Revision History
o
+---------+---------------------------+---------+--------+-------------------+
| Version | Description | Section | Status | Date |
+---------+---------------------------+---------+--------+-------------------+
| 1.0 | Initial public release. | -- | Final | 2018-February-21 |
+---------+---------------------------+---------+--------+-------------------+
Legal Disclaimer
o 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.
Cisco Security Vulnerability Policy
o 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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