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AUSCERT External Security Bulletin Redistribution
Cisco IOS and NX-OS Software Locator/ID Separation Protocol
Packet Denial of Service Vulnerability
24 March 2016
AusCERT Security Bulletin Summary
Product: Cisco Catalyst 6500 and 6800 Series Switches
Cisco Nexus 7000 and Nexus 7700 Series Switches
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2016-1351
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Cisco Security Advisory
Cisco IOS and NX-OS Software Locator/ID Separation Protocol Packet Denial of
Advisory ID: cisco-sa-20160323-lisp
Published: 2016 March 23 16:00 GMT
Version 1.0: Final
Base - 7.8
No workarounds available
Cisco Bug IDs:
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:
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.
Cisco Catalyst 6500 and 6800 Series Switches running Cisco IOS Software, and
Cisco Nexus 7000 and Nexus 7700 Series Switches with an M1 Series Gigabit
Ethernet Module running Cisco NX-OS Software are vulnerable when LISP is
configured. LISP is not enabled by default on either platform.
For information about which Cisco IOS and NX-OS Software versions are
vulnerable, see the "Fixed Software" section of this advisory.
Cisco Catalyst 6500 and 6800 Series Switches
LISP support was first introduced in release 15.1(1)SY1. To determine if LISP
is configured on the device, use the show running-config | include lisp
command to see if router lisp is configured, as shown in the following
iosRouter# show running-config | include lisp
Determining the Cisco IOS Software Release
To determine which Cisco IOS Software release is running on a Cisco product,
administrators can log in to the device and issue the show version command to
display the system banner. If the device is running Cisco IOS Software, the
system banner displays text similar to Cisco Internetwork Operating System
Software or Cisco IOS Software. The image name displays in parentheses,
followed by the Cisco IOS Software release number and release name.
The following example identifies a Cisco product that is running Cisco IOS
Software Release 15.2(1)SY1 with an installed image name of
iosRouter# show version
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
Additional information about Cisco IOS Software release naming conventions is
available in White Paper: Cisco IOS and NX-OS Software Reference Guide.
Nexus 7000 and 7700 Series Switches
The Nexus 7000 and 7700 Series Switches added LISP support in software release
5.2(1). The Nexus 7000 and 7700 Series Switches with LISP configured are
vulnerable only if the LISP packet is input on an M1 Series Gigabit Ethernet
Module. Use the show module | include M1 command to check whether an M1 module
is installed in the Nexus 7000 chassis, as shown in the following example:
nxosRouter# show module | include M1
3 48 10/100/1000 Mbps Ethernet XL Module N7K-M148GT-11L powered-up
If 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:
nxosRouter# show feature | include lisp
lisp 1 enabled
The show ip lisp command can be used to determine the LISP configuration for
the M1 interfaces:
nxosRouter# show ip lisp
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
For more information on the Nexus 7000 and 7700 Series Switches LISP
Configuration, see Configuring Locator/ID Separation Protocol.
Determine the Cisco NX-OS Software Release
To determine the Cisco NX-OS Software release that is running on a Cisco Nexus
7000 Series switch, administrators can log in to the device and issue the show
version command. The following example identifies the 6.2(14) release:
nxosRouter# show version
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
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
BIOS: version 2.12.0
kickstart: version 6.2(14)
system: version 6.2(14)
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):
For further information, see the Unsupported Hardware section in Cisco Nexus
7000 Series NX-OS Release Notes, Release 7.3.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
Cisco has confirmed that this vulnerability does not affect Cisco IOS-XR and
Cisco 7600 Series Routers are not affected by this vulnerability.
The LISP network architecture and protocol implements a new semantic for IP
addressing by creating two new namespaces: Endpoint Identifiers (EIDs), which
are assigned to end hosts, and Routing Locators (RLOCs), which are assigned to
devices (primarily routers) that make up the global routing system. Splitting
EID and RLOC functions improves routing system scalability, multihoming
efficiency, and ingress traffic engineering. LISP end site support is
configured on devices such as Cisco routers. This...
Indicators of Compromise
On Cisco Catalyst 6500 and 6800 Series Switches, an exploit of this
vulnerability causes the device to reload with a reset reason of EARL Recovery
On Cisco Nexus 7000 and 7700 Series Switches with M1 Series Gigabit Ethernet
Module, this vulnerability causes the M1 module to reload with a reset reason
of Fatal Interrupt Metropolis device error.
Cisco Technical Assistance Center (TAC) should review the system log file to
determine if the device has been affected by this vulnerability.
There are no workarounds that address this vulnerability.
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:
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
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):
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.
Cisco IOS Software
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:
Initiate a search by choosing one or more releases from a drop-down menu or
uploading a file from a local system for the tool to parse
Enter the output of the show version command for the tool to parse
Create a custom search by including all previously published Cisco Security
Advisories, a specific advisory, or all advisories in the most recent bundled
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 releasefor example, 15.1(4)M2in the following field:
Cisco NX-OS Software
This vulnerability is fixed in software version 7.3(0)D1(1). The Cisco Nexus
7000 and Nexus 7700 Series Software can be downloaded from the Software Center
on Cisco.com by visiting http://www.cisco.com/cisco/software/navigator.html
and choosing Downloads Home > Products > Switches > Data Center Switches >
Nexus 7000 Series Switches.
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.
This vulnerability was found during resolution of a customer case handled by
the Cisco TAC.
Version Description Section Status Date
1.0 Initial public release. Final 2016-March-23
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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