Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.0782 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 Resolution: Patch/Upgrade CVE Names: CVE-2016-1351 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160323-lisp - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Advisory Cisco IOS and NX-OS Software Locator/ID Separation Protocol Packet Denial of Service Vulnerability High Advisory ID: cisco-sa-20160323-lisp Published: 2016 March 23 16:00 GMT Version 1.0: Final CVSS Score: Base - 7.8 Workarounds: No workarounds available Cisco Bug IDs: CSCuu64279 CSCuv11993 CVE-2016-1351 CWE-399 Summary 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. Affected Products Vulnerable Products 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 example: iosRouter# show running-config | include lisp router 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 c6880x-ADVENTERPRISEK9-M: 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 LISP Multicast: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 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) . . . 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): N7K-M148GT-11 N7K-M132XP-12 N7K-M148GS-11 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 vulnerability. Cisco has confirmed that this vulnerability does not affect Cisco IOS-XR and Cisco IOS-XE. Cisco 7600 Series Routers are not affected by this vulnerability. Details 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 Patch errors. 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. 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 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. 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 publication 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: Check 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. Source This vulnerability was found during resolution of a customer case handled by the Cisco TAC. URL http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160323-lisp Revision History Version Description Section Status Date 1.0 Initial public release. Final 2016-March-23 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBVvNk+H6ZAP0PgtI9AQJACg//Z4FIe+nFLqkLXDFfGesZUwOGZgEilhaZ UG8Z3Jc9PfhvVYUXLH6SwRlnZDmxsqepFOfu1XLDD4KVdlSLTQebZoT5cqys47/Q iDM5TiAph0uVga8Wa4ciB8VExjHJnn91OIYXwoQaUk3oE0h+hw4qoURONLgW52iz 7BWkzU3TxwHGGyfFlYzzy043gsJVJfQEVh9HGl4F6iZeVRKueHqYG835lzY8LYRv TfoT4fmb7d/thlu6mxYYfCTLxSu05jj+omNrZN2/QQgkhBM8Z09YGWgH7uBXwXj5 833nWIrDWlmgVt4AUII7/2hnZkLzbyjljvYZSTHPlFwjuA3dzxINrDZMCXhGn0ie GzF+/rkNDBydbYgukJ5Ra/gPryQrjpnVK1KPlguwMdZFJtyr8LNEEstZiW0DprRX YHA197mvx4fDDkAY1s+Ycwgyg51v0rRH5dpyxyJV4Yi/kBlGp5VjTNzuA99LgFRq 8MkTLCtNcnMnfeqKEYFcxnOQaMxVcbfUcGq1nHYMCfpRKsCUk3Qvig2XIMWhCevH oE0V4osabZLsNyKBtBzqYwJQu+mHOdaUmmZiZXONYx+u2caHF5A9bHpD09NCcLyw Nk99vy5DQVPcZjsRaZhFP5MLEB6B7vEf/yWnu13rpWQzWwpKFpM78eJ67QguiP+a 4CmD0NLafro= =0B1/ -----END PGP SIGNATURE-----