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CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
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A vulnerability in the Cisco Fabric Services component of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a buffer overflow, resulting in a denial of service (DoS) condition.
The vulnerability is due to insufficient validation of Cisco Fabric Services packets. An attacker could exploit this vulnerability by sending a crafted Cisco Fabric Services packet to an affected device. A successful exploit could allow the attacker to cause a buffer overflow, resulting in process crashes and a DoS condition on the device.
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:
This advisory is part of the March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 26 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-fabric-dos
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Vulnerable Products
This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco NX-OS Software:
- MDS 9000 Series Multilayer Switches
- Nexus 3000 Series Switches
- Nexus 3500 Platform Switches
- Nexus 3600 Platform Switches
- Nexus 7000 Series Switches
- Nexus 7700 Series Switches
- Nexus 9000 Series Switches in standalone NX-OS mode
- Nexus 9500 R-Series Line Cards and Fabric Modules
- UCS 6200 Series Fabric Interconnects
- UCS 6300 Series Fabric Interconnects
- UCS 6400 Series Fabric Interconnects
For information about determining whether a device is configured to use Cisco Fabric Services, see the Details section of this advisory.
For information about which Cisco NX-OS Software releases are vulnerable, see the Fixed Software section of this advisory.
Determining the Cisco NX-OS Software Release
Administrators can check the release of Cisco NX-OS Software that is running on a device by using the show version command in the device CLI. The following example shows the output of this command on a device that is running Cisco NX-OS Software Release 7.0(3)I5(1):
nxos-switch# show version Cisco Nexus Operating System (NX-OS) Software TAC support: http://www.cisco.com/tac Copyright (C) 2002-2016, Cisco and/or its affiliates. All rights reserved. The copyrights to certain works contained in this software are owned by other third parties and used and distributed under their own licenses, such as open source. This software is provided "as is," and unless otherwise stated, there is no warranty, express or implied, including but not limited to warranties of merchantability and fitness for a particular purpose. Certain components of this software are licensed under the GNU General Public License (GPL) version 2.0 or GNU General Public License (GPL) version 3.0 or the GNU Lesser General Public License (LGPL) Version 2.1 or Lesser General Public License (LGPL) Version 2.0. A copy of each such license is available at http://www.opensource.org/licenses/gpl-2.0.php and http://opensource.org/licenses/gpl-3.0.html and http://www.opensource.org/licenses/lgpl-2.1.php and http://www.gnu.org/licenses/old-licenses/library.txt. Software BIOS: version 07.57 NXOS: version 7.0(3)I5(1) [build 7.0(3)I5(0.9)] BIOS compile time: 06/29/2016 NXOS image file is: bootflash:///nxos.7.0.3.I5.0.9.bin NXOS compile time: 8/1/2016 23:00:00 [08/02/2016 00:30:32] . . .
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following Cisco products:- Firepower 2100 Series Firewalls
- Firepower 4100 Series Next-Generation Firewalls
- Firepower 9300 Security Appliance
- Nexus 1000V Switch for Microsoft Hyper-V
- Nexus 1000V Switch for VMware vSphere
- Nexus 2000 Series Fabric Extenders
- Nexus 5500 Platform Switches
- Nexus 5600 Platform Switches
- Nexus 6000 Series Switches
- Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode
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Cisco Fabric Services provides a common infrastructure for distributing and synchronizing configuration data between Cisco devices that are on the same network and with virtual port channels (vPCs). This includes configuration data for applications and features that are compatible with and enabled to use Cisco Fabric Services—for example, Distributed Device Alias Services, Network Time Protocol (NTP), and user and administrator roles.
To distribute and synchronize data, Cisco Fabric Services can be configured to use any of the following distribution types:
- Cisco Fabric Services over Fibre Channel (CFSoFC): Distributes data over a Fibre Channel (FC), such as a virtual storage area network (VSAN). CFSoFC distribution is enabled by default.
- Cisco Fabric Services over Ethernet (CFSoE): Distributes data over an Ethernet network. CFSoE packets transit only on the vPC peer link, which is used to sync states between a pair of vPC switches. CFSoE distribution is disabled by default.
- Cisco Fabric Services over IP (CFSoIP): Distributes data over an IPv4 or IPv6 network. CFSoIP distribution is disabled by default.
The vulnerability described in this advisory is due to insufficient input validation that could occur when the affected software processes Cisco Fabric Services packets that it receives during distribution and synchronization operations. Exploitation of the vulnerability does not require any applications to be enabled to use Cisco Fabric Services. Instead, exploitation depends on which Cisco Fabric Services distribution types are configured for a device. In addition, the attack vectors vary based on which distribution types are configured, as follows:
- CFSoFC: If FC ports are configured for a device, an attack could occur via Fibre Channel over Ethernet (FCoE) or Fibre Channel over IP (FCIP). In this scenario, an attack could succeed in the data plane, not the management plane, of any FC port. If no FC ports are configured for a device, this distribution type cannot be used to exploit the vulnerability.
- CFSoE: An attack is possible from an attacker who has direct access to the vPC peer link. No other peer, neighbor, or vPC-connected device can be used to exploit the vulnerability.
- CFSoIP: An attack is possible from any node that has IP network connectivity to the management interface of a device. In this scenario, an attack cannot succeed from the data plane.
If a device is enabled to use more than one distribution type, the applicable attack vectors for all those distribution types exist for the device.
Administrators can display configuration information and check the distribution status of Cisco Fabric Services for a device by using the show cfs status command in the device CLI, as shown in the following example:
switch# show cfs status Distribution : Enabled Distribution over IP : Disabled IPv4 multicast address : 239.255.70.83 IPv6 multicast address : ff15::efff:4653 Distribution over Ethernet : Disabled
In the preceding example, the Enabled value in the Distribution field of the command output indicates that Cisco Fabric Services is enabled for the device and the device is configured to use the default Cisco Fabric Services distribution type, which is CFSoFC. The Disabled value in the Distribution over IP field and the Distribution over Ethernet field indicates that the device is not additionally configured to use the CFSoIP and CFSoE distribution types.
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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.htmlAdditionally, 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.htmlCustomers 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 upgrade to an appropriate release as indicated in the applicable table in this section. To help ensure a complete upgrade solution, customers should consider that this advisory is part of a bundled publication. The following page provides a complete list of bundle advisories: Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.
In the following tables, the left column lists releases of Cisco FXOS Software or Cisco NX-OS Software. The center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by all the vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities.
Although the releases listed in the right column of each table include fixes for the vulnerabilities, the fix related to the Cisco NX-OS Software Image Signature Verification Vulnerability requires a BIOS upgrade as part of the software upgrade. Customers who are upgrading the software for any of the following products are advised to refer to this advisory for further details about the BIOS upgrade and affected product IDs and BIOS versions:
- Nexus 3000 Series Switches
- Nexus 9000 Series Fabric Switches in ACI mode
- Nexus 9000 Series Switches in standalone NX-OS mode
- Nexus 9500 R-Series Line Cards and Fabric Modules
MDS 9000 Series Multilayer Switches: CSCvj10178
Cisco NX-OS Software Release First Fixed Release for This Vulnerability First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories 5.2 6.2(25) 6.2(27) 6.2 6.2(25) 6.2(27) 7.3 8.1(1b) 8.3(2) 8.1 8.1(1b) 8.3(2) 8.2 8.3(1) 8.3(2)
8.3 Not vulnerable 8.3(2)
Nexus 3000 Series Switches: CSCvh99066
Cisco NX-OS Software Release First Fixed Release for This Vulnerability First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories Prior to 7.0(3)I4 7.0(3)I4(9) 7.0(3)I7(6) 7.0(3)I4 7.0(3)I4(9) 7.0(3)I7(6) 7.0(3)I5 7.0(3)I7(4) 7.0(3)I7(6) 7.0(3)I6 7.0(3)I7(4) 7.0(3)I7(6) 7.0(3)I7 7.0(3)I7(4) 7.0(3)I7(6) 9.2 Not vulnerable 9.2(2)
Nexus 3500 Platform Switches: CSCvj10181
Cisco NX-OS Software Release First Fixed Release for This Vulnerability First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories Prior to 6.0(2)A8 6.0(2)A8(10) 6.0(2)A8(11) 6.0(2)A8 6.0(2)A8(10) 6.0(2)A8(11) 7.0(3) 7.0(3)I7(4) 7.0(3)I7(6) 9.2 Not vulnerable 9.2(2)
Nexus 3600 Platform Switches: CSCvj10176
Cisco NX-OS Software Release First Fixed Release for This Vulnerability First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories 7.0(3)F3 7.0(3)F3(3c)1 7.0(3)F3(5) 9.2 Not vulnerable 9.2(2)
Nexus 7000 and 7700 Series Switches: CSCvj10178
Cisco NX-OS Software Release First Fixed Release for This Vulnerability First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories Prior to 6.2 Not vulnerable 6.2(22) 6.2 6.2(22) 6.2(22)
7.2 8.2(3) 8.2(3) 7.3 Umbrella SMU for CSCvj10178 and CSCvj638071 8.2(3) 8.0 8.2(3) 8.2(3) 8.1 8.2(3) 8.2(3) 8.2 8.2(3) 8.2(3)
8.3 Not vulnerable 8.3(2)
Nexus 9000 Series Switches in Standalone NX-OS Mode: CSCvh99066
Cisco NX-OS Software Release First Fixed Release for This Vulnerability First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories Prior to 7.0(3)I4 7.0(3)I4(9) 7.0(3)I7(6) 7.0(3)I4 7.0(3)I4(9) 7.0(3)I7(6) 7.0(3)I5 7.0(3)I7(4) 7.0(3)I7(6) 7.0(3)I6 7.0(3)I7(4) 7.0(3)I7(6) 7.0(3)I7 7.0(3)I7(4) 7.0(3)I7(6) 9.2 Not vulnerable 9.2(2)
Nexus 9500 R-Series Line Cards and Fabric Modules: CSCvj10176
Cisco NX-OS Software Release First Fixed Release for This Vulnerability First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories 7.0(3)F1 7.0(3)F3(3c)1 7.0(3)F3(5) 7.0(3)F2 7.0(3)F3(3c)1 7.0(3)F3(5) 7.0(3)F3 7.0(3)F3(3c)1 7.0(3)F3(5) 9.2 Not vulnerable 9.2(2)
UCS 6200, 6300, and 6400 Fabric Interconnects: CSCvj10183
Cisco NX-OS Software Release First Fixed Release for This Vulnerability First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories Prior to 3.1 3.2(3j) 3.2(3j) 3.1 3.2(3j) 3.2(3j) 3.2 3.2(3j) 3.2(3j)
4.0 4.0(2a) 4.0(2a)
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco Nexus Switch, administrators can refer to the following Recommended Releases documents. If a security advisory recommends a later release, Cisco recommends following the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series and 3500 Series Switches
Cisco Nexus 5000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
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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.
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This vulnerability was found during internal security testing.
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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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Version Description Section Status Date 1.1 Added SMU fix for Nexus 7000 and 7700 for the 7.3 software release. Fixed Software Final 2019-March-19 1.0 Initial public release. — Final 2019-March-06
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