Operating System:

[Cisco]

Published:

08 August 2019

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.2997
       Cisco IoT Field Network Director TLS Renegotiation Denial of
                           Service Vulnerability
                               8 August 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco IoT Field Network Director
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1957  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-fnd-dos

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

Cisco IoT Field Network Director TLS Renegotiation Denial of Service
Vulnerability

Priority:        Medium

Advisory ID:     cisco-sa-20190807-fnd-dos

First Published: 2019 August 7 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds availableCisco Bug IDs:   CSCvp71888

CVE-2019-1957    

CWE-399

CVSS Score:
5.3  AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X

Summary

  o A vulnerability in the web interface of Cisco IoT Field Network Director
    could allow an unauthenticated, remote attacker to trigger high CPU usage,
    resulting in a denial of service (DoS) condition on an affected device.

    The vulnerability is due to improper handling of Transport Layer Security
    (TLS) renegotiation requests. An attacker could exploit this vulnerability
    by sending renegotiation requests at a high rate. A successful exploit
    could increase the resource usage on the system, eventually leading to a
    DoS condition.

    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:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-fnd-dos

Affected Products

  o Vulnerable Products

    At the time of publication, this vulnerability affected Cisco IoT Field
    Network Director releases earlier than 4.4.2-11.

    See the Details section in the bug ID(s) at the top of this advisory for
    the most complete and current information.

    Products Confirmed Not Vulnerable

    Only products listed in the Vulnerable Products section of this advisory
    are known to be affected by this vulnerability.

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

  o 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
    providers.

    Fixed Software

    At the time of publication, Cisco IoT Field Network Director releases
    4.4.2-11 and later contained the fix for this vulnerability.

    See the Details section in the bug ID(s) at the top of this advisory for
    the most complete and current information.

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.

Source

  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.

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-fnd-dos

Revision History

  o +---------+--------------------------+---------+--------+-----------------+
    | Version |       Description        | Section | Status |      Date       |
    +---------+--------------------------+---------+--------+-----------------+
    | 1.0     | Initial public release.  | -       | Final  | 2019-August-07  |
    +---------+--------------------------+---------+--------+-----------------+

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