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             AUSCERT External Security Bulletin Redistribution

                              ESB-2020.0036.2
  Cisco Data Center Network Manager Authentication Bypass Vulnerabilities
                              16 January 2020

===========================================================================

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

Product:           Cisco Data Center Network Manager (DCNM)
Publisher:         Cisco Systems
Operating System:  Windows
                   Linux variants
                   Virtualisation
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Unauthorised Access             -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-15977 CVE-2019-15976 CVE-2019-15975

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200102-dcnm-auth-bypass

Revision History:  January 16 2020: Vendor advises that proof-of-concept exploit code is available.
                   January  3 2020: Initial Release

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

Cisco Data Center Network Manager Authentication Bypass Vulnerabilities

Priority:        Critical
Advisory ID:     cisco-sa-20200102-dcnm-auth-bypass
First Published: 2020 January 2 16:00 GMT
Last Updated:    2020 January 15 15:58 GMT
Version 1.3:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvq85945 CSCvq89859 CSCvq89898

CVE-2019-15975   
CVE-2019-15976   
CVE-2019-15977   

CWE-798

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

Summary

  o Multiple vulnerabilities in the authentication mechanisms of Cisco Data
    Center Network Manager (DCNM) could allow an unauthenticated, remote
    attacker to bypass authentication and execute arbitrary actions with
    administrative privileges on an affected device.

    For more information about these vulnerabilities, see the Details section
    of this advisory.

    Cisco has released software updates that address these vulnerabilities.
    There are no workarounds that address these vulnerabilities.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20200102-dcnm-auth-bypass

Affected Products

  o Vulnerable Products

    These vulnerabilities affect Cisco DCNM software releases earlier than
    Release 11.3(1) for Microsoft Windows, Linux, and virtual appliance
    platforms.

    Products Confirmed Not Vulnerable

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

Details

  o Three vulnerabilities in the authentication mechanisms of Cisco Data Center
    Network Manager (DCNM) could allow an unauthenticated, remote attacker to
    bypass authentication and execute arbitrary actions with administrative
    privileges on an affected device.

    The vulnerabilities are not dependent on one another; exploitation of one
    of the vulnerabilities is not required to exploit another vulnerability. In
    addition, a software release that is affected by one of the vulnerabilities
    may not be affected by the other vulnerabilities.

    Details about the vulnerabilities are as follows.

    Vulnerability Details

    Cisco Data Center Network Manager REST API Authentication Bypass
    Vulnerability

    A vulnerability in the REST API endpoint of Cisco DCNM could allow an
    unauthenticated, remote attacker to bypass authentication on an affected
    device.

    The vulnerability exists because a static encryption key is shared between
    installations. An attacker could exploit this vulnerability by using the
    static key to craft a valid session token. A successful exploit could allow
    the attacker to perform arbitrary actions through the REST API with
    administrative privileges.

    CVE ID: CVE-2019-15975

    Cisco Data Center Network Manager SOAP API Authentication Bypass
    Vulnerability

    A vulnerability in the SOAP API endpoint of Cisco DCNM could allow an
    unauthenticated, remote attacker to bypass authentication on an affected
    device.

    The vulnerability exists because a static encryption key is shared between
    installations. An attacker could exploit this vulnerability by using the
    static key to craft a valid session token. A successful exploit could allow
    the attacker to perform arbitrary actions through the SOAP API with
    administrative privileges.

    CVE ID: CVE-2019-15976

    Cisco Data Center Network Manager Authentication Bypass Vulnerability

    A vulnerability in the web-based management interface of Cisco DCNM could
    allow an unauthenticated, remote attacker to bypass authentication on an
    affected device.

    The vulnerability is due to the presence of static credentials. An attacker
    could exploit this vulnerability by using the static credentials to
    authenticate against the user interface. A successful exploit could allow
    the attacker to access a specific section of the web interface and obtain
    certain confidential information from an affected device. This information
    could be used to conduct further attacks against the system.

    CVE ID: CVE-2019-15977

Workarounds

  o There are no workarounds that address these vulnerabilities.

Fixed Software

  o Cisco has released free software updates that address the vulnerabilities
    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:
    https://www.cisco.com/c/en/us/products/end-user-license-agreement.html

    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
    providers.

    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:
    https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

    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
    upgrade.

    Fixed Releases

    Cisco fixed these vulnerabilities in Cisco DCNM Software releases 11.3(1)
    and later.

    To download the software from the Software Center on Cisco.com, do the
    following:

     1. Click Browse All .
     2. Choose Cloud and Systems Management > Data Center Infrastructure
        Management > Data Center Network Manager .
     3. Choose a release from the left pane of the Data Center Network Manager
        page.

Exploitation and Public Announcements

  o The Cisco Product Security Incident Response Team (PSIRT) is aware that
    proof-of-concept exploit code is available for the vulnerabilities that are
    described in this advisory.

    Cisco PSIRT is not aware of any malicious use of the vulnerabilities that
    are described in this advisory.

Source

  o Cisco would like to thank Steven Seeley (mr_me) of Source Incite, working
    with Trend Micro's Zero Day Initiative, for reporting these
    vulnerabilities.

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-20200102-dcnm-auth-bypass

Revision History

  o +---------+--------------------+---------------+--------+-----------------+
    | Version |    Description     |    Section    | Status |      Date       |
    +---------+--------------------+---------------+--------+-----------------+
    |         | Updated            | Exploitation  |        |                 |
    | 1.3     | information about  | and Public    | Final  | 2020-January-15 |
    |         | the availability   | Announcements |        |                 |
    |         | of exploit code.   |               |        |                 |
    +---------+--------------------+---------------+--------+-----------------+
    | 1.2     | Updated the Source | Source        | Final  | 2020-January-02 |
    |         | section.           |               |        |                 |
    +---------+--------------------+---------------+--------+-----------------+
    | 1.1     | Updated the Source | Source        | Final  | 2020-January-02 |
    |         | section.           |               |        |                 |
    +---------+--------------------+---------------+--------+-----------------+
    | 1.0     | Initial public     | -             | Final  | 2020-January-02 |
    |         | release.           |               |        |                 |
    +---------+--------------------+---------------+--------+-----------------+

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