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AUSCERT External Security Bulletin Redistribution
ESB-2018.1693
Cisco IP Phone 6800, 7800, and 8800 Series with Multiplatform Firmware
Session Initiation Protocol Denial of Service Vulnerability
7 June 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IP Phone 6800, 7800, and 8800 Series
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0316
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-multiplatform-sip
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Cisco IP Phone 6800, 7800, and 8800 Series with Multiplatform Firmware Session
Initiation Protocol Denial of Service Vulnerability
High
Advisory ID: cisco-sa-20180606-multiplatform-sip
First Published: 2018 June 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvi24718
CVSS Score: Base 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-2018-0316
CWE-399
Summary
o A vulnerability in the Session Initiation Protocol (SIP) call-handling
functionality of Cisco IP Phone 6800, 7800, and 8800 Series Phones with
Multiplatform Firmware could allow an unauthenticated, remote attacker to
cause an affected phone to reload unexpectedly, resulting in a temporary
denial of service (DoS) condition.
The vulnerability exists because the firmware of an affected phone
incorrectly handles errors that could occur when an incoming phone call is
not answered. An attacker could exploit this vulnerability by sending a set
of maliciously crafted SIP packets to an affected phone. A successful
exploit could allow the attacker to cause the affected phone to reload
unexpectedly, resulting in a temporary DoS condition.
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-20180606-multiplatform-sip
Affected Products
o Vulnerable Products
This vulnerability affects Cisco IP Phone 6800, 7800, and 8800 Series
Phones with Multiplatform Firmware if they are running a Multiplatform
Firmware release prior to Release 11.1(2).
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o 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: https://www.cisco.com/c/en/us/products/
end-user-license-agreement.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: https://www.cisco.com/c
/en/us/support/web/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
This vulnerability is fixed in Multiplatform Firmware Releases 11.1(2) and
later for Cisco IP Phone 6800, 7800, and 8800 Series Phones. Customers are
advised to download the latest firmware release by visiting the Software
Center on Cisco.com and navigating to Collaboration Endpoints > IP Phones >
IP Phones with Multiplatform Firmware.
Exploitation and Public Announcements
o 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
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o 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
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-multiplatform-sip
Revision History
o +---------+---------------------------+---------+--------+---------------+
| Version | Description | Section | Status | Date |
+---------+---------------------------+---------+--------+---------------+
| 1.0 | Initial public release. | -- | Final | 2018-June-06 |
+---------+---------------------------+---------+--------+---------------+
Legal Disclaimer
o 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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