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             AUSCERT External Security Bulletin Redistribution

         Cisco Application Policy Infrastructure Controller Out Of
              Band Management IP Tables Bypass Vulnerability
                              24 January 2020


        AusCERT Security Bulletin Summary

Product:           Cisco Application Policy Infrastructure Controller (APIC)
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Reduced Security -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-3139  

Original Bulletin: 

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

Cisco Application Policy Infrastructure Controller Out Of Band Management IP
Tables Bypass Vulnerability

Priority:        Medium

Advisory ID:     cisco-sa-iptable-bypass-GxW88XjL

First Published: 2020 January 22 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds availableCisco Bug IDs:   CSCvs10135



CVSS Score:


  o [CVE-2020-3139_su]

    A vulnerability in the out of band (OOB) management interface IP table rule
    programming for Cisco Application Policy Infrastructure Controller (APIC)
    could allow an unauthenticated, remote attacker to bypass configured deny
    entries for specific IP ports. These IP ports would be permitted to the OOB
    management interface when, in fact, the packets should be dropped.

    The vulnerability is due to the configuration of specific IP table entries
    for which there is a programming logic error that results in the IP port
    being permitted. An attacker could exploit this vulnerability by sending
    traffic to the OOB management interface on the targeted device. A
    successful exploit could allow the attacker to bypass configured IP table
    rules to drop specific IP port traffic. The attacker has no control over
    the configuration of the device itself.

    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 [CVE-2020-3139_ap]


    Vulnerable Products


    At the time of publication, this vulnerability affected Cisco APIC releases
    prior to the first fixed software Release 4.2(3j).

    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.

    Cisco has confirmed that this vulnerability does not affect Nexus 9000
    Series Fabric Switches in Application Centric Infrastructure (ACI) mode.



  o [CVE-2020-3139_de]

    The result of this vulnerability is that the UI CLI command acidiag run
    iptables-list will show that the IP port number is configured for deny but
    that configuration setting was not actually properly programmed.

    For additional information on how to secure the OOB management interface,
    see Securing Management Access .



  o [CVE-2020-3139_wa]

    There are no workarounds that address this vulnerability.


Fixed Software

  o [CVE-2020-3139_fs]

    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 APIC Release 4.2(3j) 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.


Exploitation and Public Announcements

  o [CVE-2020-3139_ex]

    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 [CVE-2020-3139_vs]

    This vulnerability was found during the resolution of a Cisco TAC support


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-JAN-22  |

- --------------------------END INCLUDED TEXT--------------------

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