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AUSCERT External Security Bulletin Redistribution
Cisco Unified Communications Manager Session Initiation
Protocol Denial of Service Vulnerability
9 July 2019
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-2019-1887
Revision History: July 9 2019: Update 1.1 from Cisco
July 4 2019: Initial Release
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Cisco Unified Communications Manager Session Initiation Protocol Denial of
Advisory ID: cisco-sa-20190703-cucm-dos
First Published: 2019 July 3 16:00 GMT
Last Updated: 2019 July 8 22:30 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvo70834
o A vulnerability in the Session Initiation Protocol (SIP) protocol
implementation of Cisco Unified Communications Manager and Unified
Communications Manager Session Management Edition could allow an
unauthenticated, remote attacker to cause a denial of service (DoS)
The vulnerability is due to insufficient validation of input SIP traffic.
An attacker could exploit this vulnerability by sending a malformed SIP
packet to an affected Cisco Unified Communications Manager or Unified
Communications Manager Session Management Edition. A successful exploit
could allow the attacker to trigger a new registration process on all
connected phones, temporarily disrupting 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 Cisco Unified Communications Manager and Unified
Communications Manager Session Management Edition.
For information about which Cisco Unified Communications Manager and
Unified Communications Manager Session Management Edition releases are
vulnerable, see the Fixed Software section of this advisory.
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 the following
Hosted Collaboration Mediation Fulfillment
Prime Collaboration Assurance
Prime Collaboration Provisioning
Prime License Manager
Unified Communications Manager IM and Presence Service (IM&P)
Unified Contact Center Express (UCCx)
Unified Intelligence Center (UIC)
Virtualized Voice Browser
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 are advised to upgrade to an appropriate fixed software release
or apply the corresponding patch file as indicated in the following table:
Cisco Unified Fix Options
Prior to 10.5(2) Migrate to 10.5(2) and apply patch file
10.5(2) Apply patch file
11.5 Apply patch file
Apply patch file
or upgrade to 12.0(1)SU3
Apply patch file
or upgrade to 12.5(1)SU1
The patch files are available in the Cisco Unity Connection Utilities -
COP-Files section of the software downloads page for each release.
Instructions for applying the patch are in the release notes that accompany
each patch file.
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 |
| | Add the Unified | Summary, | | |
| 1.1 | Communications Manager | Affected | Final | 2019-July-09 |
| | Session Management Edition | Products | | |
| | as a vulnerable product. | | | |
| 1.0 | Initial public release. | - | Final | 2019-July-03 |
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