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AUSCERT External Security Bulletin Redistribution
ESB-2019.0621
Cisco Webex Meetings Desktop App and Cisco Webex Productivity Tools Update
Service Command Injection Vulnerability
28 February 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Webex Meetings Desktop App
Cisco Webex Productivity Tools
Publisher: Cisco Systems
Operating System: Windows
Impact/Access: Administrator Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1674
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190227-wmda-cmdinj
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Webex Meetings Desktop App and Cisco Webex Productivity Tools Update
Service Command Injection Vulnerability
Priority: High
Advisory ID: cisco-sa-20190227-wmda-cmdinj
First Published: 2019 February 27 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvn55874
CVE-2019-1674
CWE-78
CVSS Score:
7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the update service of Cisco Webex Meetings Desktop App
and Cisco Webex Productivity Tools for Windows could allow an
authenticated, local attacker to execute arbitrary commands as a privileged
user.
The vulnerability is due to insufficient validation of user-supplied
parameters. An attacker could exploit this vulnerability by invoking the
update service command with a crafted argument. An exploit could allow the
attacker to run arbitrary commands with SYSTEM user privileges.
While the CVSS Attack Vector metric denotes the requirement for an attacker
to have local access, administrators should be aware that in Active
Directory deployments, the vulnerability could be exploited remotely by
leveraging the operating system remote management tools.
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190227-wmda-cmdinj
Affected Products
o Vulnerable Products
This vulnerability affects all Cisco Webex Meetings Desktop App releases
prior to 33.6.6, and Cisco Webex Productivity Tools Releases 32.6.0 and
later prior to 33.0.7, when running on a Microsoft Windows end-user system.
To determine whether a vulnerable version of Cisco Webex Meetings Desktop
App is installed on a Windows machine, users can launch the Cisco Webex
Meetings application and click the gear icon in the top right of the
application window, then choose the About... menu entry; a popup window
displaying the currently installed version will open. This is also
documented in the article Check the Cisco Webex Meetings Desktop App
Version .
To determine whether a vulnerable version of Cisco Webex Productivity Tools
is installed on a Windows machine, users can right-click the Webex
Productivity Tools icon on the Windows taskbar and select About from the
menu; a popup window displaying the currently installed version will open.
This is also documented in the article Check the Cisco Webex Productivity
Tools Version for Windows .
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 these vulnerabilities do not affect the Apple Mac
OS X or Linux versions of these products.
Workarounds
o There are no workarounds that address this vulnerability.
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
Cisco Webex Meetings Desktop App (Cisco Webex Meetings Suite WBS33)
This vulnerability is fixed in Cisco Webex Meetings Desktop App Release
33.6.6 and 33.9.1 releases.
Administrators can update the Cisco Webex Meetings Desktop App for their
user base by following the instructions available in the document IT
Administrator Guide for Mass Deployment of the Cisco Webex Meetings Desktop
App .
Users can update the Cisco Webex Meetings Desktop App by launching the
Cisco Webex Meetings application and clicking the gear icon in the top
right of the application window and then choosing the Check for Updates
entry from the drop-down list. This is also documented in the article
Update the Cisco Webex Meetings Desktop App .
Cisco Webex Productivity Tools (Cisco Webex Meetings Suite WBS32)
This vulnerability is fixed in Cisco Webex Productivity Tools Release
33.0.7.
Cisco Webex Productivity Tools is an optional companion application that
allows users to quickly schedule and join meetings from their desktop
without the need to access the Meetings website. The application should not
be confused with the Cisco Webex Meetings Client, which is the main client
application that provides the core functionality to host or attend a Webex
meeting.
Administrators can update the Cisco Webex Productivity Tools for their user
base by following the instructions available in the document IT
Administrator Guide for Mass Deployment of the Cisco Webex Meetings Desktop
App .
Users can update the Cisco Webex Productivity Tools by launching the Cisco
Webex Meetings application and clicking Settings in the top right of the
application window and then choosing Check for Updates from the drop-down
list. This is documented in more detail in the article Check for Cisco
Webex Productivity Tools Updates for Windows .
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 Marcos Accossatto of SecureAuth 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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190227-wmda-cmdinj
Revision History
o +---------+-------------------------+---------+--------+------------------+
| Version | Description | Section | Status | Date |
+---------+-------------------------+---------+--------+------------------+
| 1.0 | Initial public release. | - | Final | 2019-February-27 |
+---------+-------------------------+---------+--------+------------------+
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