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AUSCERT External Security Bulletin Redistribution
Cisco Unified Communications Manager IM&P Service, Cisco TelePresence VCS,
and Cisco Expressway Series Denial of Service Vulnerability
6 June 2019
AusCERT Security Bulletin Summary
Product: Cisco Unified Communications Manager IM&P Service
Cisco TelePresence VCS
Cisco Expressway Series
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2019-1845
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Cisco Unified Communications Manager IM&P Service, Cisco TelePresence VCS, and
Cisco Expressway Series Denial of Service Vulnerability
Advisory ID: cisco-sa-20190605-cucm-imp-dos
First Published: 2019 June 5 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvn00361CSCvp51956
o A vulnerability in the authentication service of the Cisco Unified
Communications Manager IM and Presence (Unified CM IM&P) Service, Cisco
TelePresence Video Communication Server (VCS), and Cisco Expressway Series
could allow an unauthenticated, remote attacker to cause a service outage
for users attempting to authenticate, resulting in a denial of service
The vulnerability is due to insufficient controls for specific memory
operations. An attacker could exploit this vulnerability by sending a
malformed Extensible Messaging and Presence Protocol (XMPP) authentication
request to an affected system. A successful exploit could allow the
attacker to cause an unexpected restart of the authentication service,
preventing users from successfully authenticating. Exploitation of this
vulnerability does not impact users who were authenticated prior to an
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 the Cisco following products if they are running
a vulnerable release:
Expressway Series configured for Mobile and Remote Access with IM&P
Service (Releases X8.1 to X12.5.2)
TelePresence VCS configured for Mobile and Remote Access with IM&P
Service (Releases X8.1 to X12.5.2)
Unified Communications Manager IM&P Service (multiple releases)
For information about which releases are vulnerable, see the Fixed Software
section of this advisory.
To determine whether Mobile and Remote Access with IM&P Service is
configured on Cisco Expressway Series or Cisco TelePresence VCS,
administrators can log in to the web-based management interface, choose
Status > Unified Communications Status , and check the value of the IM and
Presence Service entry. A product is vulnerable if the IM and Presence
Service entry is present and its value is Configured .
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
For Cisco Expressway Series and Cisco TelePresence VCS, Cisco fixed this
vulnerability in Releases X12.5.3 and later.
For Cisco Unified Communications Manager IM&P, customers are advised to
upgrade to an appropriate fixed software release as indicated in the
Cisco Unified CM IM&P Service Major Release First Fixed Release
10.5(2) 11.5(1) SU6 or 12.5(1)
11.5(1) 11.5(1) SU6
12.5(1) Not vulnerable
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 internal security testing.
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 |
| 1.0 | Initial public release. | - | Final | 2019-June-05 |
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