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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1687
             Cisco WebEx Cross-Site Scripting Vulnerabilities
                                7 June 2018

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

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

Product:           Cisco WebEx
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0357 CVE-2018-0356 

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-webex-xss
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-webex-xss1

Comment: This bulletin contains two (2) Cisco Systems security advisories.

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

Cisco WebEx Cross-Site Scripting Vulnerability

Medium
Advisory ID: cisco-sa-20180606-webex-xss
First Published: 2018 June 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvi63757

CVSS Score: Base 6.1
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:X/RL:X/RC:X
CVE-2018-0356
CWE-79

Summary

  o A vulnerability in the web framework of Cisco WebEx could allow an
    unauthenticated, remote attacker to conduct a cross-site scripting (XSS)
    attack against the user of the web interface of an affected system.

    The vulnerability is due to insufficient input validation of certain
    parameters that are passed to the affected software via the HTTP GET and
    HTTP POST methods. An attacker who can convince a user to follow an
    attacker-supplied link could execute arbitrary script or HTML code in the
    user's browser in the context of an affected site.

    There are no workarounds that address this vulnerability.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-webex-xss

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco WebEx. For information about affected
    software releases, consult the Cisco bug ID(s) at the top of this advisory.

    Products Confirmed Not Vulnerable

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

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

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

    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.

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 Cisco would like to thank Adam Willard 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.

Subscribe to Cisco Security Notifications

  o Subscribe

Action Links for This Advisory

  o Understanding Cross-Site Scripting (XSS) Threat Vectors

Related to This Advisory

  o Cross-Site Scripting

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-webex-xss

Revision History

  o +---------+---------------------------+---------+--------+---------------+
    | Version |        Description        | Section | Status |     Date      |
    +---------+---------------------------+---------+--------+---------------+
    | 1.0     | Initial public release.   | --      | Final  | 2018-June-06  |
    +---------+---------------------------+---------+--------+---------------+

Legal Disclaimer

  o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
    OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
    FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
    OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
    THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

    A standalone copy or paraphrase of the text of this document that omits the
    distribution URL is an uncontrolled copy and may lack important information
    or contain factual errors. The information in this document is intended for
    end users of Cisco products.

- -------------------------------------------------------------------------------

Cisco WebEx Cross-Site Scripting Vulnerability

Medium
Advisory ID: cisco-sa-20180606-webex-xss1
First Published: 2018 June 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvi71274

CVSS Score: Base 6.1
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:X/RL:X/RC:X
CVE-2018-0357
CWE-79

Summary

  o A vulnerability in the web framework of Cisco WebEx could allow an
    unauthenticated, remote attacker to conduct a cross-site scripting (XSS)
    attack against the user of the web interface of an affected system.

    The vulnerability is due to insufficient input validation of certain
    parameters that are passed to the affected software via the HTTP GET and
    HTTP POST methods. An attacker who can convince a user to follow an
    attacker-supplied link could execute arbitrary script or HTML code in the
    user's browser in the context of an affected site.

    There are no workarounds that address this vulnerability.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-webex-xss1

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco WebEx. For information about affected
    software releases, consult the Cisco bug ID(s) at the top of this advisory.

    Products Confirmed Not Vulnerable

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

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

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

    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.

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 Cisco would like to thank Daniel Diez Tainta 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.

Subscribe to Cisco Security Notifications

  o Subscribe

Action Links for This Advisory

  o Understanding Cross-Site Scripting (XSS) Threat Vectors

Related to This Advisory

  o Cross-Site Scripting

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-webex-xss1

Revision History

  o +---------+---------------------------+---------+--------+---------------+
    | Version |        Description        | Section | Status |     Date      |
    +---------+---------------------------+---------+--------+---------------+
    | 1.0     | Initial public release.   | --      | Final  | 2018-June-06  |
    +---------+---------------------------+---------+--------+---------------+

Legal Disclaimer

  o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
    OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
    FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
    OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
    THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

    A standalone copy or paraphrase of the text of this document that omits the
    distribution URL is an uncontrolled copy and may lack important information
    or contain factual errors. The information in this document is intended for
    end users of Cisco products.

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

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