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AUSCERT External Security Bulletin Redistribution
ESB-2020.3483
Cisco Expressway Series and TelePresence Video Communication
Server Denial of Service Vulnerability
8 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Expressway Series
Cisco TelePresence Video Communication Server
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3596
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-expressway-vcs-dos-n6xxTMZB
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Cisco Expressway Series and TelePresence Video Communication Server Denial of
Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-expressway-vcs-dos-n6xxTMZB
First Published: 2020 October 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvu78519
CVE-2020-3596
CWE-789
Summary
o A vulnerability in the Session Initiation Protocol (SIP) of Cisco
Expressway Series and Cisco TelePresence Video Communication Server (VCS)
could allow an unauthenticated, remote attacker to cause a denial of
service (DoS) condition on an affected device.
The vulnerability is due to incorrect handling of incoming SIP traffic. An
attacker could exploit this vulnerability by sending a series of SIP
packets to an affected device. A successful exploit could allow the
attacker to exhaust memory on an affected device, causing it to crash and
leading to a DoS condition.
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-expressway-vcs-dos-n6xxTMZB
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco Expressway
Series and Cisco TelePresence VCS releases X12.6.3 and earlier.
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 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
For information about fixed software releases, see the Details section in
the bug ID(s) at the top of this advisory.
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 the resolution of a Cisco TAC support
case.
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-expressway-vcs-dos-n6xxTMZB
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-OCT-07 |
+----------+---------------------------+----------+--------+--------------+
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