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AUSCERT External Security Bulletin Redistribution
Cisco Unified Communications Manager IM & Presence Service
Denial of Service Vulnerability
5 September 2018
AusCERT Security Bulletin Summary
Product: Cisco Unified Communications Manager
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-0409
Revision History: September 5 2018: Update from Cisco
August 16 2018: Initial Release
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Cisco Unified Communications Manager IM & Presence Service Denial of Service
Advisory ID: cisco-sa-20180815-ucmimps-dos
First Published: 2018 August 15 16:00 GMT
Last Updated: 2018 September 4 15:53 GMT
VersionÂ 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvg97663
A vulnerability in the XCP Router service of the Cisco Unified
Communications Manager IM & Presence Service (CUCM IM&P) and the Cisco
TelePresence Video Communication Server (VCS) and Expressway could allow an
unauthenticated, remote attacker to cause a temporary service outage for
all IM&P users, resulting in a denial of service (DoS) condition.
The vulnerability is due to improper validation of user-supplied input. An
attacker could exploit this vulnerability by sending a malicious IPv4 or
IPv6 packet to an affected device on TCP port 7400. An exploit could allow
the attacker to overread a buffer, resulting in a crash and restart of the
XCP Router service.
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:
o Vulnerable Products
This vulnerability affects all releases of the following Cisco products
prior to their respective first fixed release:
- Cisco Unified Communications Manager IM & Presence Service
- Cisco TelePresence Video Communication Server (VCS) and Expressway with
Unified Communications mode set to Mobile and Remote Access
Identifying the Unified Communications Manager IM & Presence Service
To determine whether a vulnerable version of the Cisco Unified
Communications Manager IM & Presence Service is running on a device,
administrators can use the show version active command in the command-line
interface (CLI) for the device.
The following example shows the output from a device that is running Cisco
Unified Communications Manager IM & Presence Service version 11.5(1):
admin: show version active
Active Master Version: 126.96.36.19900-4
Active Version Installed Software Options:
No Installed Software Options Found.
Identifying the Cisco TelePresence VCS and Expressway Version
Administrators can log in to the web-based GUI of Cisco TelePresence VCS
and Expressway and view the current version in the lower-right corner in
the Version field. Alternatively, administrators can view the Software
version field by navigating to Status > System > Information.
Identifying the Cisco TelePresence VCS and Expressway Unified
To identify the current Unified Communications mode on Cisco TelePresence
VCS and Expressway, administrators can log in to the web-based GUI of the
system and look for the current setting of the Unified Communications mode
option under Configuration > Unified Communications > Configuration.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco WebEx
o There are no workarounds that address this vulnerability.
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
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
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
Customers should upgrade to an appropriate release as indicated in the
Cisco Unified Communications Manager IM & Presence Service
Cisco CUCM IM&P Service Major Release First Fixed Release
10.5(1) and earlier Migrate to 11.5(1)SU4
10.5(2) 10.5(2)SU (Future release)
11.0(1) Migrate to 11.5(1)SU4
^1 This release is not publicly available on Cisco.com. Please contact
Cisco TAC if you need this release.
Cisco TelePresence Video Communication Server (VCS) and Expressway
Cisco TelePresence VCS and Expressway Major Release First Fixed Release
X7 and earlier Migrate to X8.11
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.
o This vulnerability was found during the resolution of a Cisco TAC support
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.
| Version | Description | Section | Status | Date |
| | Corrected the first fixed | Fixed | | |
| 1.1 | release for CUCM IM&P | Software | Final | 2018-September-04 |
| | 12.0(1) | | | |
| 1.0 | Initial public release. | -- | Final | 2018-August-15 |
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.
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