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AUSCERT External Security Bulletin Redistribution
ESB-2017.1005
Cisco Unified Communications Manager Denial of Service Vulnerability
21 April 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-2017-3808
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-ucm
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Cisco Security Advisory
Cisco Unified Communications Manager Denial of Service Vulnerability
High
Advisory ID:
cisco-sa-20170419-ucm
First Published:
2017 April 19 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCuz72455
CVE-2017-3808
CWE-119
CVSS Score:
Base 7.5, Temporal 7.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2017-3808
CWE-119
Summary
A vulnerability in the Session Initiation Protocol (SIP) UDP throttling
process of Cisco Unified Communications Manager (Cisco Unified CM) could
allow an unauthenticated, remote attacker to cause a denial of service
(DoS) condition on an affected device.
The vulnerability is due to insufficient rate limiting protection. An
attacker could exploit this vulnerability by sending the affected device a
high rate of SIP messages. An exploit could allow the attacker to cause the
device to reload unexpectedly. The device and services will restart
automatically.
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-ucm
Affected Products
Vulnerable Products
This vulnerability affects Cisco Unified Communications Manager
(CallManager) releases prior to the first fixed release. For information
about fixed releases, see the Fixed Software section of this advisory.
To determine the release of Cisco Unified Communications Manager running on
a device, administrators can use the show version active command in the CLI
of the device.
The following example shows the output from a device that is running
Release 11.5(1) of the service:
admin: show version active
Active Master Version: 11.5.1.10000-4
Active Version Installed Software Options:
No Installed Software Options Found.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Cisco has confirmed that Cisco Unified CM Releases 9.x and earlier are not
affected by this vulnerability.
Workarounds
There are no workarounds that address this vulnerability.
Fixed Software
Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
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.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC:
http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Customers are advised to install an appropriate fixed release as indicated
in this section.
The following list indicates the first minor release that includes the fix
for this this vulnerability:
10.5.2.14900-16
11.0.1.23900-5
11.5.1.12900-2
Customers can download software for the Cisco Unified Communication Manager
Service from the Software Center on Cisco.com by navigating to Products >
Unified Communications > Call Control > Unified Communications Manager
(CallManager).
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 support case.
Cisco Security Vulnerability Policy
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.
Subscribe to Cisco Security Notifications
Subscribe
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170419-ucm
Revision History
Version Description Section Status Date
1.0 Initial public release. Final 2017-April-19
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.
Cisco Security Vulnerability Policy
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.
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