ESB-2018.0919 - [Cisco] Cisco IOS XE: Cross-site scripting - Remote with user interaction 2018-03-29

Printable version
PGP/GPG verifiable version

Hash: SHA256

             AUSCERT External Security Bulletin Redistribution

     Cisco IOS XE Software Web UI Cross-Site Scripting Vulnerabilities
                               29 March 2018


        AusCERT Security Bulletin Summary

Product:           Cisco IOS XE
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0190 CVE-2018-0188 CVE-2018-0186

Original Bulletin:

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

Cisco Security Advisory

Cisco IOS XE Software Web UI Cross-Site Scripting Vulnerabilities


Advisory ID:     cisco-sa-20180328-webuixss

First Published: 2018 March 28 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:



CVSS Score:


  o Multiple vulnerabilities in the web-based user interface (web UI) of
    Cisco IOS XE Software could allow an unauthenticated, remote attacker to
    conduct a cross-site scripting (XSS) attack against a user of the web UI of
    the affected software.

    The vulnerabilities are due to insufficient input validation of certain
    parameters that are passed to the affected software via the web UI. An
    attacker could exploit these vulnerabilities by persuading a user of the
    affected UI to access a malicious link or by intercepting a user request
    for the affected UI and injecting malicious code into the request. A
    successful exploit could allow the attacker to execute arbitrary script
    code in the context of the affected UI or allow the attacker to access
    sensitive browser-based information on the user's system.

    There are no workarounds that address these vulnerabilities.

    This advisory is available at the following link:

Affected Products

  o Vulnerable Products

    These vulnerabilities affect Cisco devices that are running a vulnerable
    release of Cisco IOS XE Software, if the HTTP Server feature is enabled.
    The default state of the HTTP Server feature is version-dependent.

    For information about which Cisco IOS XE Software releases are vulnerable,
    consult the Cisco bug ID(s) at the top of this advisory.

    Assessing the HTTP Server Configuration

    To determine whether the HTTP Server feature is enabled for a device,
    administrators can log in to the device and use the show running-config |
    include http (secure|server) command in the CLI to check for the presence
    of the ip http server command or the ip http secure-server command in the
    global configuration. If either command is present and configured, the HTTP
    Server feature is enabled for the device.

    The following example shows the output of the show running-config | include
    http (secure|server) command for a router that has the HTTP Server feature

        Router# show running-config | include http (secure|server)

        ip http server
        ip http secure-server

    Determining the Cisco IOS XE Software Release

    To determine which Cisco IOS XE Software release is running on a device,
    administrators can log in to the device, use the show version command in
    the CLI, and then refer to the system banner that appears. If the device is
    running Cisco IOS XE Software, the system banner displays Cisco IOS
    Software, Cisco IOS XE Software, or similar text.

    The following example shows the output of the command for a device that is
    running Cisco IOS XE Software Release 16.2.1 and has an installed image
    name of CAT3K_CAA-UNIVERSALK9-M:

        ios-xe-device# show version

        Cisco IOS Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version Denali 16.2.1, RELEASE SOFTWARE (fc1)
        Technical Support:
        Copyright (c) 1986-2016 by Cisco Systems, Inc.
        Compiled Sun 27-Mar-16 21:47 by mcpre

    For information about the naming and numbering conventions for Cisco IOS XE
    Software releases, see the Cisco IOS and NX-OS Software Reference Guide.

    Products Confirmed Not Vulnerable

    No other Cisco products are currently known to be affected by these

    Cisco has confirmed that these vulnerabilities do not affect Cisco IOS
    Software, Cisco IOS XR Software, or Cisco NX-OS Software.


  o There are no workarounds that address these vulnerabilities.

Fixed Software

  o For detailed information about fixed software releases, consult the Cisco
    bug ID(s) at the top of this advisory.

    For a mapping of Cisco IOS XE Software releases to Cisco IOS Software
    releases, refer to the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S
    Release Notes, or Cisco IOS XE 3SG Release Notes, depending on the
    Cisco IOS XE Software release.

    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

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 vulnerabilities that are
    described in this advisory.


  o These vulnerabilities were 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



Revision History

    | Version  |        Description         | Section  | Status  |      Date      |
    | 1.0      | Initial public release.    | --       | Final   | 2018-March-28  |

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

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email:
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.


« Back to bulletins