Hash: SHA256

             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
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1887  

Original Bulletin: 

Revision History:  July 9 2019: Update 1.1 from Cisco
                   July 4 2019: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Unified Communications Manager Session Initiation Protocol Denial of
Service Vulnerability

Priority:        High

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



CVSS Score:


  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:

Affected Products

  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
    Cisco products:

       Emergency Responder
       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)
       Unity Connection
       Virtualized Voice Browser


  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:

    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

    Fixed Releases

    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
    Communications Manager
    Major Release
    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
    12.0                    ciscocm.V12-0-1-22900-11_CSCvo70834_C0003-1.cop.sgn
                            or upgrade to 12.0(1)SU3
                            Apply patch file
    12.5                    ciscocm.V12-5-1-10000-22_CSCvo70834_C0003-1.cop.sgn
                            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.


  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/

Revision History

  o +---------+----------------------------+----------+--------+--------------+
    | 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 |

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
Comment: http://www.auscert.org.au/render.html?it=1967