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             AUSCERT External Security Bulletin Redistribution

           Cisco DNA Center Authentication Bypass Vulnerability
                               28 June 2019


        AusCERT Security Bulletin Summary

Product:           Cisco DNA Center
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Unauthorised Access -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1848  

Original Bulletin: 

Revision History:  June 28 2019: Updated workaround made available
                   June 20 2019: Initial Release

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

Cisco DNA Center Authentication Bypass Vulnerability

Priority:        Critical

Advisory ID:     cisco-sa-20190619-dnac-bypass

First Published: 2019 June 19 16:00 GMT

Last Updated:    2019 June 27 17:34 GMT

Version 1.1:     Final

Workarounds:     No workarounds availableCisco Bug IDs:   CSCvj03748



CVSS Score:


  o A vulnerability in Cisco Digital Network Architecture (DNA) Center could
    allow an unauthenticated, adjacent attacker to bypass authentication and
    access critical internal services.

    The vulnerability is due to insufficient access restriction to ports
    necessary for system operation. An attacker could exploit this
    vulnerability by connecting an unauthorized network device to the subnet
    designated for cluster services. A successful exploit could allow an
    attacker to reach internal services that are not hardened for external

    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 DNA Center Software releases prior to 1.3.

    Determining the Cisco DNA Center Software Release

    To determine which Cisco DNA Center Software release is running on a
    system, administrators can use a compatible browser to log in to the Cisco
    DNA Center GUI with HTTPS, click Settings (gear icon) on the DNA Center
    home page, and then click About DNA Center . The System version field
    indicates which release is currently running on the system.

    Products Confirmed Not Vulnerable

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


  o A workaround for this vulnerability is available for customers who cannot
    upgrade to a fixed release. To coordinate implementation of the workaround,
    contact the Cisco Technical Assistance Center (TAC) .

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

    This vulnerability is fixed in Cisco DNA Center Software Release 1.3.

    Cisco DNA Center is a dedicated physical appliance that is purchased from
    Cisco with the DNA Center ISO image preinstalled. System updates are
    available for installation from the Cisco cloud and are not available for
    download from the Software Center on Cisco.com. To upgrade to a fixed
    release of Cisco DNA Center Software, administrators can use the System
    Updates feature of the software. For more information, refer to the Cisco
    Digital Network Architecture Center Administrator Guide and the release
    notes for the release to be installed.

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.


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

Revision History

  o +---------+--------------------------+------------+--------+--------------+
    | Version |       Description        |  Section   | Status |     Date     |
    | 1.1     | Updated workaround       | Workaround | Final  | 2019-June-27 |
    |         | availability.            |            |        |              |
    | 1.0     | Initial public release.  | -          | Final  | 2019-June-19 |

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