Operating System:

[Cisco]

Published:

13 February 2019

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0448
          Cisco Network Assurance Engine CLI Access with Default
                          Password Vulnerability
                             13 February 2019

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

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

Product:           Cisco Network Assurance Engine
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Root Compromise -- Console/Physical
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1688  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190212-nae-dos

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

Cisco Network Assurance Engine CLI Access with Default Password Vulnerability

Priority:        High

Advisory ID:     cisco-sa-20190212-nae-dos

First Published: 2019 February 12 16:00 GMT

Version 1.0:     Final

Workarounds:     Yes

Cisco Bug IDs:   CSCvo18229

CVE-2019-1688    

CWE-798

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

Summary

  o A vulnerability in the management web interface of Cisco Network Assurance
    Engine (NAE) could allow an unauthenticated, local attacker to gain
    unauthorized access or cause a Denial of Service (DoS) condition on the
    server.

    The vulnerability is due to a fault in the password management system of
    NAE. An attacker could exploit this vulnerability by authenticating with
    the default administrator password via the CLI of an affected server. A
    successful exploit could allow the attacker to view potentially sensitive
    information or bring the server down, causing a DoS condition.

    Cisco has released software updates that address this vulnerability. There
    are workarounds that address this vulnerability.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190212-nae-dos

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco Network Assurance Engine (NAE) Release 3.0
    (1). The default password condition only affects new installations of
    Release 3.0(1).

    Determining the NAE Software Release

    To determine the software release that is running on the server,
    administrators can log in to the web interface using the http(s)://
    <system-ip> access URL and navigate to the Gear > About Network Assurance
    Engine screen. The release information is displayed as follows:

        Cisco Network Assurance Engine
              Version 3.0(1)

    Products Confirmed Not Vulnerable

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

Details

  o Customers upgrading from earlier versions will not be affected by this
    vulnerability. However, any user passwords changed from the web management
    interface in the affected release will not be propagated to the CLI. The
    old password, from before the change in the web management interface, would
    still be associated to the username in the CLI. See the Workarounds section
    for information on how to synchronize the passwords again.

Workarounds

  o The default administrator password can be changed from the CLI by setting a
    new password with the passwd command. Customers wishing to implement this
    workaround should contact Cisco TAC (Technical Assistance Center) so the
    default password can be entered securely over a remote support session.
    This will need to be done for all nodes in the cluster.

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:
    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

    This vulnerability is fixed in Cisco NAE Release 3.0(1a).

    To fix the vulnerability, the administrator password should be changed from
    the management web interface after upgrading to version 3.0(1a).

    Software Download

    Customers can download Cisco Network Assurance Software from the Software
    Center on Cisco.com by doing the following:

       Click Browse all.
       Navigate to Data Center Analytics > Network Assurance Engine.
       Access Cisco NAE releases by using the left pane of the software
        downloads navigation.

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.

Source

  o This vulnerability was found during internal security testing.

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.

Subscribe to Cisco Security Notifications

  o Subscribe

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190212-nae-dos

Revision History

  o +---------+-------------------------+---------+--------+------------------+
    | Version |       Description       | Section | Status |       Date       |
    +---------+-------------------------+---------+--------+------------------+
    | 1.0     | Initial public release. | -       | Final  | 2019-February-12 |
    +---------+-------------------------+---------+--------+------------------+

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