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AUSCERT External Security Bulletin Redistribution
ESB-2017.2238
Cisco Unified Communications Manager Trust Verification
Service Denial of Service Vulnerability
7 September 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Unified Communications Manager
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-6791
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-ucm
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Cisco Unified Communications Manager Trust Verification Service Denial of
Service Vulnerability
Medium
Advisory ID: cisco-sa-20170906-ucm
First Published: 2017 September 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
CSCux21905
CVSS Score:
Base 5.3
Base 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X
CVE-2017-6791
CWE-119
Summary
A vulnerability in the Trust Verification Service (TVS) of Cisco Unified
Communications Manager could allow an unauthenticated, remote attacker to
cause a denial of service (DoS) condition on an affected device.
The vulnerability is due to improper handling of Transport Layer Security
(TLS) traffic by the affected software. An attacker could exploit this
vulnerability by generating incomplete traffic streams. A successful exploit
could allow the attacker to deny access to the TVS for an affected device,
resulting in a DoS condition, until an administrator restarts the service.
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-20170906-ucm
Affected Products
Vulnerable Products
This vulnerability affects Cisco Unified Communications Manager. 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 internal security testing.
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-ucm
Revision History
Version Description Section Status Date
1.0 Initial public release. — Final 2017-September-06
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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