Operating System:

Published:

21 February 2019

Protect yourself against future threats.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0540
       Cisco Webex Teams for iOS Arbitrary File Upload Vulnerability
                             21 February 2019

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

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

Product:           Cisco Webex Teams
Publisher:         Cisco Systems
Operating System:  IOS
Impact/Access:     Create Arbitrary Files -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-1689  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190220-webx-ios-file

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

Cisco Webex Teams for iOS Arbitrary File Upload Vulnerability

Priority:        Medium

Advisory ID:     cisco-sa-20190220-webx-ios-file

First Published: 2019 February 20 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:   CSCvn16403

CVE-2019-1689    

CWE-20

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

Summary

  o 
    A vulnerability in the client application for iOS of Cisco Webex Teams
    could allow an authenticated, remote attacker to upload arbitrary files
    within the scope of the iOS application.

    The vulnerability is due to improper input validation in the client
    application. An attacker could exploit this vulnerability by sending a
    malicious file to a targeted user and persuading the user to manually open
    it. An exploit could allow the attacker to overwrite sensitive application
    files and eventually cause a denial of service (DoS) condition by
    foreclosing future access to the system to the targeted user.

    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-20190220-webx-ios-file

Affected Products

  o Vulnerable Products

    This vulnerability affects the client application for iOS of Cisco Webex
    Teams. 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 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-20190220-webx-ios-file

Revision History

  o 
    +----------+--------------------------+----------+--------+-------------------+
    | Version  |       Description        | Section  | Status |       Date        |
    +----------+--------------------------+----------+--------+-------------------+
    | 1.0      | Initial public release.  | --        | Final  | 2019-February-20  |
    +----------+--------------------------+----------+--------+-------------------+

- --------------------------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 auscert@auscert.org.au
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:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iQIVAwUBXG4Eg2aOgq3Tt24GAQh56w//Zmd/HX0vovnqwmFckIKUfWz1sLGHStG2
NFp/iD2LKBakb6z3e1DtcHoArMcqIqTTcUcFsHQBSio+gyuwGlg8b120VBrWmkxo
iEeS1KVc02h2kmsJ/YFtZnQEinqaC5e6HvFtucUrJkqKYrQfUl5IcT+7NataXGMF
Qe91wTTMmS+WIXk/nlgv/j1oGNzOktd7V4gN6Joo1bUprOlWoubQNdj2nBcqsJTv
o0KT/A8qGt5ZWyfXDBc9rWhYB43wUyfZl3bQmRXyJXPPwsXvC9yuVYtyb3rykxzC
7v71ubzKfJpryCMXDm+4jclnFLBg2q2eUQmJ4vQRBLrX7ZBkWh/BQcxx87w8JAGo
842CGWBMWZ18RyUG6RsjKV6WImMniKrW+PGCBfHbCsXOqUgX9ikLINHxO0hlJJWl
XT6wpNdLO+AQ9Gck4lB9xcplp/zly2KZ69tg5SUxnIBDboWvbDOmja94x0Uod2Gs
ODAptLMIoSD8HoWecUoeORoxQgMF6wzY4SjSEsqDgsSsy+Ytwk+acFBS+7b4tQL9
dCuAr2GTqMXQr36RrKs1MIAxOYz25hin9rG4Vurq4cOxmDLmBxB0DbyqzpAoQZ0C
M2PPUSAAfzShFcV/pjef2DKJY97rkaH66mAcPbFwBKpBqBdJDnFzWKhkGsaCcGzr
Ppn0rr3f3tA=
=5Ut6
-----END PGP SIGNATURE-----