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24 January 2020

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             AUSCERT External Security Bulletin Redistribution

          Cisco Firepower Management Center Lightweight Directory
            Access Protocol Authentication Bypass Vulnerability
                              24 January 2020


        AusCERT Security Bulletin Summary

Product:           Cisco Firepower Management Center (FMC)
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-16028  

Original Bulletin: 

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

Cisco Firepower Management Center Lightweight Directory Access Protocol
Authentication Bypass Vulnerability

Priority:        Critical

Advisory ID:     cisco-sa-20200122-fmc-auth

First Published: 2020 January 22 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds availableCisco Bug IDs:   CSCvr95287



CVSS Score:


  o A vulnerability in the web-based management interface of Cisco Firepower
    Management Center (FMC) could allow an unauthenticated, remote attacker to
    bypass authentication and execute arbitrary actions with administrative
    privileges on an affected device.

    The vulnerability is due to improper handling of Lightweight Directory
    Access Protocol (LDAP) authentication responses from an external
    authentication server. An attacker could exploit this vulnerability by
    sending crafted HTTP requests to an affected device. A successful exploit
    could allow the attacker to gain administrative access to the web-based
    management interface of the affected device.

    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 FMC Software if it is configured to
    authenticate users of the web-based management interface through an
    external LDAP server.

    For information about which Cisco FMC Software releases are vulnerable, see
    the Fixed Software section of this advisory.

    Determine Whether External Authentication Through LDAP Is Enabled

    To determine whether external authentication using an LDAP server is
    configured on the device, administrators can navigate to System > Users >
    External Authentication and look for an External Authentication Object that
    uses LDAP as the authentication method. The External Authentication Object
    must be enabled for the FMC to be affected.

    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 Cisco Adaptive
    Security Appliance (ASA) Software or Cisco Firepower Threat Defense (FTD)


  o There are no workarounds that address this vulnerability. However,
    customers who cannot immediately apply a software fix may evaluate the
    possibility of disabling LDAP authentication for FMC access and using other
    authentication methods until a software fix can be applied.

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

    In the following table, the left column lists releases of Cisco FMC
    Software. The center column indicates whether a release is affected by the
    vulnerability described in this advisory and the first release that
    includes the fix for this vulnerability. The right column indicates whether
    a hotfix patch is available for an affected release.

    Cisco    First     Hotfix Patch
    FMC      Fixed
    Software Release
    Earlier  Migrate
    than     to a      Not available.
    6.1.0 ^1 fixed
    6.1.0    to a      Sourcefire_3D_Defense_Center_S3_Hotfix_ES-
    6.2.0 ^2 to a      Not available.
    6.2.1 ^2 to a      Not available.
    6.2.2 ^2 to a      Not available.
    6.2.3    (February Sourcefire_3D_Defense_Center_S3_Hotfix_DO-
    6.3.0    (May      Cisco_Firepower_Mgmt_Center_Hotfix_AI-
                       Cisco_Firepower_Mgmt_Center_Hotfix_U- (for
    6.4.0   releases and later)
                       Cisco_Firepower_Mgmt_Center_Hotfix_T- (for
                       releases and earlier)
    6.5.0 ^ Not available.

    1. Cisco FMC Software releases 6.0.1 and earlier have reached end of
    software maintenance. Customers are advised to migrate to a supported
    release that includes the fix for this vulnerability.

    2. Customers who are running a 6.2.0, 6.2.1, or 6.2.2 release should
    migrate either to a release that integrates the fix or to a release for
    which a hotfix patch is available. For example, customers could migrate to
    Release 6.2.3 and then install the hotfix patch, which is

    3. Cisco FMC Software Release integrates a fix for this
    vulnerability; however, it is no longer available for download.

    Customers who are running the following Cisco FMC Software releases can
    remediate by doing the following:

       Releases earlier than 6.1.0: Migrate to a 6.2.3 release and apply
        available hotfixes.
       6.1.0: Apply the hotfix listed in the preceding table or migrate to a
        6.2.3 release and apply available hotfix.
       6.2.0 through 6.2.2: Migrate to a 6.2.3 release and apply available
       6.2.3 or 6.3.0: Apply available hotfixes; maintenance releases will be
        available later this year.
       6.4.0: Apply available hotfixes or upgrade to Release
       6.5.0: Upgrade to

    Customers may install a fix either by upgrading to a fixed release or by
    installing a hotfix patch. The availability of each option for all the
    supported software releases is documented in the preceding table.

    To upgrade to a release that includes a fix for this vulnerability or to
    install a hotfix patch, customers are advised to follow the Cisco Firepower
    Management Center Upgrade Guide and then review the appropriate release
    notes or, if applicable, review the Firepower Hotfix Release Notes .

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 Michael J. Venema of Family Care Network and
    Johan Anderstrom of QLS for independently reporting this vulnerability.

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       |
    | 1.0     | Initial public release.  | -       | Final  | 2020-January-22 |

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