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AUSCERT External Security Bulletin Redistribution
Cisco Meeting Server TURN Server Unauthorized Access and
Information Disclosure Vulnerability
14 September 2017
AusCERT Security Bulletin Summary
Product: Cisco Meeting Server
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Access Confidential Data -- Existing Account
CVE Names: CVE-2017-12249
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Cisco Security Advisory: Cisco Meeting Server TURN Server Unauthorized Access
and Information Disclosure Vulnerability
Advisory ID: cisco-sa-20170913-cmsturn
For Public Release: 2017 September 13 16:00 GMT
Last Updated: 2017 September 13 16:00 GMT
CVE ID(s): CVE-2017-12249
CVSS Score v(3): 9.1 CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
A vulnerability in the Traversal Using Relay NAT (TURN) server
included with Cisco Meeting Server (CMS) could allow an authenticated, remote
attacker to gain unauthenticated or unauthorized access to components of or
sensitive information in an affected system.
The vulnerability is due to an incorrect default configuration of the TURN
server, which could expose internal interfaces and ports on the external
interface of an affected system. An attacker could exploit this vulnerability
by using a TURN server to perform an unauthorized connection to a Call Bridge,
a Web Bridge, or a database cluster in an affected system, depending on the
deployment model and CMS services in use. A successful exploit could allow the
attacker to gain unauthenticated access to a Call Bridge or database cluster
in an affected system or gain unauthorized access to sensitive meeting
information in an affected system. To exploit this vulnerability, the attacker
must have valid credentials for the TURN server of the affected system.
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:
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