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             AUSCERT External Security Bulletin Redistribution

        Cisco Data Center Network Manager Arbitrary File Upload and
                    Remote Code Execution Vulnerability
                             20 September 2019


        AusCERT Security Bulletin Summary

Product:           Cisco Data Center Network Manager
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Create Arbitrary Files          -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1620  

Original Bulletin: 

Revision History:  September 20 2019: Cisco notes that a proof-of-concept
                                      exploit is now available.
                   June      27 2019: Initial Release

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

Cisco Data Center Network Manager Arbitrary File Upload and Remote Code
Execution Vulnerability

Priority:        Critical
Advisory ID:     cisco-sa-20190626-dcnm-codex
First Published: 2019 June 26 16:00 GMT
Last Updated:    2019 September 19 16:08 GMT
Version 1.1:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvo64647


CVSS Score:


  o A vulnerability in the web-based management interface of Cisco Data Center
    Network Manager (DCNM) could allow an unauthenticated, remote attacker to
    upload arbitrary files on an affected device.

    The vulnerability is due to incorrect permission settings in affected DCNM
    software. An attacker could exploit this vulnerability by uploading
    specially crafted data to the affected device. A successful exploit could
    allow the attacker to write arbitrary files on the filesystem and execute
    code with root privileges on 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

    The vulnerability affects Cisco Data Center Network Manager (DCNM) software
    releases prior to Release 11.2(1).

    Products Confirmed Not Vulnerable

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


  o An attacker may achieve creation of arbitrary files on the underlying DCNM
    filesystem by sending specially crafted data to a specific web servlet that
    is available on affected devices.

    In DCNM Software Release 11.0(1) and earlier, an attacker would need to be
    authenticated to the DCNM web-based management interface to exploit this

    In DCNM Software Release 11.1(1), unauthenticated access to the affected
    web servlet is available, making it possible for an unauthenticated
    attacker to exploit this vulnerability.

    Cisco removed the affected web servlet completely in DCNM Software Release


  o There are no workarounds that address this vulnerability.

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 DCNM Software Release 11.2(1) and

    The software is available for download from the Software Center on
    Cisco.com by doing the following:

     1. Click Browse All .
     2. Choose Cloud and Systems Management > Data Center Infrastructure
        Management > Data Center Network Manager .
     3. Access releases by using 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 vulnerability described
    in this advisory.

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


  o Cisco would like to thank the independent security researcher Pedro Ribeiro
    for reporting this vulnerability to iDefense's Vulnerability Contributor

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 50513
    Cisco Data Center Network Manager Arbitrary WAR File Upload


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

Revision History

  o +---------+------------------+---------------+--------+-------------------+
    | Version |   Description    |    Section    | Status |       Date        |
    |         | Documented the   |               |        |                   |
    |         | availability of  | Exploitation  |        |                   |
    | 1.1     | a                | and Public    | Final  | 2019-September-19 |
    |         | proof-of-concept | Announcements |        |                   |
    |         | exploit.         |               |        |                   |
    | 1.0     | Initial public   | -             | Final  | 2019-June-26      |
    |         | release.         |               |        |                   |

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