A vulnerability in the Locator/ID Separation Protocol (LISP) of Cisco IOS Software running on the Cisco Catalyst 6500 and 6800 Series Switches and Cisco NX-OS Software running on the Cisco Nexus 7000 and Nexus 7700 Series Switches with an M1 Series Gigabit Ethernet Module could allow an unauthenticated, remote attacker to cause a reload of the vulnerable device. The vulnerability is due to a lack of proper input validation when a malformed LISP packet header is received. An attacker could exploit this vulnerability by sending a malformed LISP packet on UDP port 4341. An exploit could allow the attacker to cause a denial of service (DoS) condition. Cisco has released software updates that address this vulnerability. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160323-lisp This advisory is part of the March 23, 2016, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes six Cisco Security Advisories that describe six vulnerabilities. All the vulnerabilities have a Security Impact Rating of "High." For a complete list of advisories and links to them, see Cisco Event Response: Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.
iosRouter# show running-config | include lispDetermining the Cisco IOS Software Release
router lisp
iosRouter# show versionAdditional information about Cisco IOS Software release naming conventions is available in White Paper: Cisco IOS and NX-OS Software Reference Guide.
Cisco IOS Software, c6880x Software (c6880x-ADVENTERPRISEK9-M), Version 15.2(1)SY1, RELEASE SOFTWARE (fc5)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Mon 11-May-15 00:26 by prod_rel_team
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nxosRouter# show module | include M1If there is an M1 Series Gigabit Ethernet Module installed, it will be vulnerable only if LISP packets are input to interfaces configured on this module. To check whether the LISP feature is enabled, use the show feature | include lisp command, as in the following example:
3 48 10/100/1000 Mbps Ethernet XL Module N7K-M148GT-11L powered-up
nxosRouter# show feature | include lispThe show ip lisp command can be used to determine the LISP configuration for the M1 interfaces:
lisp 1 enabled
nxosRouter# show ip lispFor more information on the Nexus 7000 and 7700 Series Switches LISP Configuration, see Configuring Locator/ID Separation Protocol.
LISP IP Configuration Information for VRF "default" (iid 1)
Ingress Tunnel Router (ITR):enabled
Egress Tunnel Router (ETR):disabled
Proxy-ITR Router (PTR):disabled
Proxy-ETR Router (PETR):disabled
Map Resolver (MR):disabled
Map Server (MS):disabled
LISP Multicast:disabled
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nxosRouter# show version
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
Documents: http://www.cisco.com/en/US/products/ps9372/tsd_products_support_series_home.html
Copyright (c) 2002-2015, Cisco Systems, Inc. All rights reserved.
The copyrights to certain works contained in this software are
owned by other third parties and used and distributed under
license. Certain components of this software are licensed under
the GNU General Public License (GPL) version 2.0 or the GNU
Lesser General Public License (LGPL) Version 2.1. A copy of each
such license is available at
http://www.opensource.org/licenses/gpl-2.0.php and
http://www.opensource.org/licenses/lgpl-2.1.php
Software
BIOS: version 2.12.0
kickstart: version 6.2(14)
system: version 6.2(14)
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Note: The following Cisco M1 Series Gigabit Ethernet Module Series modules are no longer supported as of Cisco NX-OS Release 7.3(0)D1(1):
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 consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to upgrade 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 Technical Assistance Center (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.
To help customers determine their exposure to vulnerabilities in Cisco IOS Software, Cisco provides a tool, the Cisco IOS Software Checker, that identifies any Cisco Security Advisories that impact a specific Cisco IOS Software release and the earliest release that fixes the vulnerabilities described in each advisory ("First Fixed"). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified ("Combined First Fixed").
Customers can use this tool to perform the following tasks:
To determine whether a release is affected by any published Cisco Security Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a Cisco IOS Software release-for example, 15.1(4)M2-in the following field:
Version | Description | Section | Status | Date |
---|---|---|---|---|
1.0 | Initial public release. | - | Final | 2016-March-23 |
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