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AUSCERT External Security Bulletin Redistribution
ESB-2020.0079
Cisco Webex Centers Denial of Service Vulnerability
9 January 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Webex Centers
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3116
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200108-webex-centers-dos
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Webex Centers Denial of Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20200108-webex-centers-dos
First Published: 2020 January 8 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvr16379CSCvr16383CSCvr16386
CVE-2020-3116
CWE-20
CVSS Score:
5.5 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the way Cisco Webex applications process Universal
Communications Format (UCF) files could allow an attacker to cause a denial
of service (DoS) condition.
The vulnerability is due to insufficient validation of UCF media files. An
attacker could exploit this vulnerability by sending a user a malicious UCF
file through a link or email attachment and persuading the user to open the
file with the affected software on the local system. A successful exploit
would cause the application to quit unexpectedly.
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-20200108-webex-centers-dos
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco Webex Event
Center, Cisco Webex Meeting Center, Cisco Webex Support Center, and Cisco
Webex Training Center, which are cloud based.
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.
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 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.
Fixed Releases
Cisco has addressed this vulnerability in Cisco Webex Event Center, Cisco
Webex Meeting Center, Cisco Webex Support Center, and Cisco Webex Training
Center, which are cloud based. No user action is required. Customers can
determine the current remediation status or software version by using the
Help function in the service GUI.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
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 Wen Guang Jiao of Qihoo 360 Core Security 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-20200108-webex-centers-dos
Revision History
o +---------+--------------------------+---------+--------+-----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+-----------------+
| 1.0 | Initial public release. | - | Final | 2020-January-08 |
+---------+--------------------------+---------+--------+-----------------+
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