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             AUSCERT External Security Bulletin Redistribution

        Cisco Data Center Network Manager XML External Entity Read
                           Access Vulnerability
                              16 January 2020


        AusCERT Security Bulletin Summary

Product:           Cisco Data Center Network Manager (DCNM)
Publisher:         Cisco Systems
Operating System:  Windows
                   Linux variants
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-15983  

Original Bulletin: 

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

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Cisco Data Center Network Manager XML External Entity Read Access Vulnerability

Priority:        Medium
Advisory ID:     cisco-sa-20200102-dcnm-xml-ext-entity
First Published: 2020 January 2 16:00 GMT
Last Updated:    2020 January 15 15:58 GMT
Version 1.1:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvr79188 CSCvr88730 CSCvr88737


CVSS Score:


    A vulnerability in the SOAP API of Cisco Data Center Network Manager (DCNM)
    could allow an authenticated, remote attacker to gain read access to
    information that is stored on an affected system. To exploit this
    vulnerability, an attacker would need administrative privileges on the DCNM

    The vulnerability exists because the SOAP API improperly handles XML
    External Entity (XXE) entries when parsing certain XML files. An attacker
    could exploit this vulnerability by inserting malicious XML content in an
    API request. A successful exploit could allow the attacker to read
    arbitrary files from the affected device.

    Note: The severity of this vulnerability is aggravated by the
    vulnerabilities described in the Cisco Data Center Network Manager
    Authentication Bypass Vulnerabilities advisory, published simultaneously
    with this one.

    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

    At the time of publication, this vulnerability affected Cisco DCNM software
    releases earlier than Release 11.3(1) for Microsoft Windows, Linux, and
    virtual appliance platforms.

    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.


  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

    Fixed Releases

    At the time of publication, Cisco DCNM Software releases 11.3(1) 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.

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

     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

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 vulnerability that is
    described in this advisory.

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


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

Action Links for This Advisory

  o Snort Rule 52525
    Snort Rule 52526
    Snort Rule 52527


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

Revision History

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

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