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AUSCERT External Security Bulletin Redistribution
ESB-2020.2858
Cisco Webex Meetings Desktop App for Windows Arbitrary File
Overwrite Vulnerability
20 August 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Webex Meetings Desktop App
Publisher: Cisco Systems
Operating System: Windows
Impact/Access: Overwrite Arbitrary Files -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3440
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-desktop-app-OVSfpVMj
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Webex Meetings Desktop App for Windows Arbitrary File Overwrite
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-webex-desktop-app-OVSfpVMj
First Published: 2020 August 19 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvt80020
CVE-2020-3440
CWE-22
CVSS Score:
6.5 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in Cisco Webex Meetings Desktop App for Windows could allow
an unauthenticated, remote attacker to overwrite arbitrary files on an
end-user system.
The vulnerability is due to improper validation of URL parameters that are
sent from a website to the affected application. An attacker could exploit
this vulnerability by persuading a user to follow a URL to a website that
is designed to submit crafted input to the affected application. A
successful exploit could allow the attacker to overwrite arbitrary files on
the affected system, possibly corrupting or deleting critical system files.
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-webex-desktop-app-OVSfpVMj
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco Webex
Meetings Desktop App for Windows releases earlier than Release 40.8.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
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 this vulnerability does not affect Cisco Webex
Meetings Desktop App for Mac.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories 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.
Fixed Releases
At the time of publication, Cisco Webex Meetings Desktop App for Windows
releases 40.8 and later contained the fix for this vulnerability.
Administrators can update the Cisco Webex Meetings Desktop App for their
user bases by following the instructions available in the IT Administrator
Guide for Mass Deployment of the Cisco Webex Meetings Desktop App .
Users can update the Cisco Webex Meetings Desktop App by following the
instructions in the Update the Cisco Webex Meetings Desktop App article.
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-webex-desktop-app-OVSfpVMj
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-AUG-19 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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