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             AUSCERT External Security Bulletin Redistribution

          Cisco IP Phone 7800 and 8800 Series Session Initiation
                 Protocol Denial of Service Vulnerability
                                9 July 2019


        AusCERT Security Bulletin Summary

Product:           Cisco IP Phone 7800 and 8800 Series
Publisher:         Cisco Systems
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1922  

Original Bulletin: 

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

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

Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of
Service Vulnerability

Priority:        Medium

Advisory ID:     cisco-sa-20190703-ip-phone-sip-dos

First Published: 2019 July 3 16:00 GMT

Last Updated:    2019 July 8 16:16 GMT

Version 1.1:     Final

Workarounds:     No workarounds availableCisco Bug IDs:   CSCvc61672



CVSS Score:


  o A vulnerability in Cisco SIP IP Phone Software for Cisco IP Phone 7800
    Series and 8800 Series could allow an unauthenticated, remote attacker to
    cause a denial of service (DoS) condition on an affected phone.

    The vulnerability is due to insufficient validation of input Session
    Initiation Protocol (SIP) packets. An attacker could exploit this
    vulnerability by altering the SIP replies that are sent to the affected
    phone during the registration process. A successful exploit could allow the
    attacker to cause the phone to reboot and not complete the registration

    There are no workarounds that address this vulnerability.

    This advisory is available at the following link:

Affected Products

  o The information provided in this advisory is the best available information
    as of the time of publication. Please consult the Release Note Enclosure on
    any associated bug ID for the most complete, accurate, and up-to-date

    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 additional information is needed, customers are advised to contact the
    Cisco Technical Assistance Center (TAC) or their contracted maintenance

    Vulnerable Products

    This vulnerability affects the following Cisco products:

       IP Conference Phone 7832
       IP Conference Phone 8832
       IP Phone 7800 Series with Multiplatform Firmware
       IP Phone 7811
       IP Phone 7821
       IP Phone 7841
       IP Phone 7861
       IP Phone 8800 Series
       IP Phone 8800 Series - VPN feature
       IP Phone 8811
       IP Phone 8841
       IP Phone 8845
       IP Phone 8845 with Multiplatform Firmware
       IP Phone 8851
       IP Phone 8861
       IP Phone 8865
       IP Phone 8865 with Multiplatform Firmware

    For information about affected software releases, consult the Cisco bug ID
    (s) at the top 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.

    Fixed Releases

    For information about fixed software releases, consult the Cisco bug ID(s)
    at the top of this advisory.


  o There are no workarounds that address this vulnerability.

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 Cisco would like to thank Thomas Sabono of xen1thLabs for reporting this

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     |
    |         | Removed Unified IP 8831    | Affected |        |              |
    | 1.1     | Conference Phone from the  | Products | Final  | 2019-July-08 |
    |         | list of affected products. |          |        |              |
    | 1.0     | Initial public release.    | -        | Final  | 2019-July-03 |

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