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AUSCERT External Security Bulletin Redistribution
Cisco Expressway Series and Cisco TelePresence Video Communication Server
REST API Denial of Service Vulnerability
19 October 2017
AusCERT Security Bulletin Summary
Product: Cisco TelePresence Video Communication Server (VCS) Software
Cisco Expressway Series Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Existing Account
CVE Names: CVE-2017-12287
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Cisco Security Advisory
Cisco Expressway Series and Cisco TelePresence Video Communication Server REST
API Denial of Service Vulnerability
Advisory ID: cisco-sa-20171018-expressway-tp-vcs
First Published: 2017 October 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
Base 4.3 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X
A vulnerability in the cluster database (CDB) management component of Cisco
Expressway Series Software and Cisco TelePresence Video Communication Server
(VCS) Software could allow an authenticated, remote attacker to cause the CDB
process on an affected system to restart unexpectedly, resulting in a
temporary denial of service (DoS) condition.
The vulnerability is due to incomplete input validation of URL requests by the
REST API of the affected software. An attacker could exploit this
vulnerability by sending a crafted URL to the REST API of the affected
software on an affected system. A successful exploit could allow the attacker
to cause the CDB process on the affected system to restart unexpectedly,
resulting in a temporary DoS condition.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
This vulnerability affects Cisco Expressway Series Software and Cisco
TelePresence Video Communication Server (VCS) Software.
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
Indicators of Compromise
Exploitation of this vulnerability will cause the CDB process to restart. When
the process restarts, the following system alarm will be generated:
An unexpected software error was detected in ClusterDB: unknown reason
Contact the Cisco Technical Assistance Center (TAC) to determine whether the
system has been compromised by exploitation of this vulnerability.
There are no workarounds that address this vulnerability.
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
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.
This vulnerability was found during internal security testing.
Version Description Section Status Date
1.0 Initial public release. Final 2017-October-18
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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