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             AUSCERT External Security Bulletin Redistribution

Cisco Small Business SPA514G IP Phones SIP Denial of Service Vulnerability
                               14 March 2019


        AusCERT Security Bulletin Summary

Product:           Cisco Small Business SPA514G IP Phones
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0389  

Original Bulletin: 

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

Cisco Small Business SPA514G IP Phones SIP Denial of Service Vulnerability

Priority:        High

Advisory ID:     cisco-sa-20190313-sip

First Published: 2019 March 13 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:   CSCvc63989



CVSS Score:


  o A vulnerability in the implementation of Session Initiation Protocol (SIP)
    processing in Cisco Small Business SPA514G IP Phones could allow an
    unauthenticated, remote attacker to cause an affected device to become
    unresponsive, resulting in a denial of service (DoS) condition.

    The vulnerability is due to improper processing of SIP request messages by
    an affected device. An attacker could exploit this vulnerability by sending
    crafted SIP messages to an affected device. A successful exploit could
    allow the attacker to cause the affected device to become unresponsive,
    resulting in a DoS condition that persists until the device is restarted

    Cisco has not 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 Small Business SPA514G IP Phones that are
    running firmware release 7.6.2SR2 or earlier.

    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:

       Other models of Small Business SPA51x IP Phones
       Small Business SPA50x IP Phones
       Small Business SPA52x IP Phones


  o There are no workarounds that address this vulnerability.

Fixed Software

  o Cisco has not released and will not release firmware updates to address the
    vulnerability described in this advisory. The Cisco Small Business SPA514G
    IP Phone has entered the end-of-life process. Refer to End-of-Sale and
    End-of-Life Announcement for the Cisco SPA514G 4-Line IP Phone and Field
    Notice FN70378 for further information.

    When considering a device migration, 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 new IP phones will be sufficient
    for their needs and current configurations will continue to be supported
    properly by the new product. If the information is not clear, customers are
    advised to contact the Cisco Technical Assistance Center (TAC) or their
    contracted maintenance providers.

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.

Action Links for This Advisory

  o Snort Rule 47426
    Cisco Small Business IP Phones Denial of Service


  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190313-sip

Revision History

  o +---------+--------------------------+---------+--------+----------------+
    | Version |       Description        | Section | Status |      Date      |
    | 1.0     | Initial public release.  | -       | Final  | 2019-March-13  |

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