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AUSCERT External Security Bulletin Redistribution
ESB-2017.1949
Cisco Meeting Server H.264 Protocol Denial of Service Vulnerability
7 August 2017
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AusCERT Security Bulletin Summary
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Product: Cisco Meeting Server
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-6763
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170802-ms
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Cisco Meeting Server H.264 Protocol Denial of Service Vulnerability
Medium
Advisory ID: cisco-sa-20170802-ms
First Published: 2017 August 2 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCve10131
CVSS Score: Base 5.8, Temporal 5.8
CVE-2017-6763
CWE-20
Summary
A vulnerability in the implementation of the H.264 protocol in Cisco
Meeting Server (CMS) could allow an unauthenticated, remote attacker to
cause a denial of service (DoS) condition on an affected system.
The vulnerability exists because the affected application does not properly
validate Fragmentation Unit (FU-A) protocol packets. An attacker could
exploit this vulnerability by sending a crafted H.264 FU-A packet through
the affected application. A successful exploit could allow the attacker to
cause a DoS condition on the affected system due to an unexpected restart
of the CMS media process on the system. Although the CMS platform continues
to operate and only the single, affected CMS media process is restarted,
a brief interruption of media traffic for certain users could occur.
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-20170802-ms
Affected Products
Vulnerable Products
This vulnerability affects Cisco Meeting Server. For information about
affected software releases, consult the Cisco bug ID(s) at the top of
this advisory.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
There are no workarounds that address this vulnerability.
Fixed Software
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
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
This vulnerability was found during the resolution of a Cisco TAC support
case.
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170802-ms
Revision History
Version Description Section Status Date
1.0 Initial public release. -- Final 2017-August-02
Legal Disclaimer
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended
for end users of Cisco products.
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