Multiple vulnerabilities in the implementation of the Lightweight Directory Access Protocol (LDAP) feature in Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the improper parsing of LDAP packets by an affected device. An attacker could exploit these vulnerabilities by sending an LDAP packet crafted using Basic Encoding Rules (BER) to an affected device. The LDAP packet must have a source IP address of an LDAP server configured on the targeted device. A successful exploit could cause the affected device to reload, resulting in a DoS condition. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxosldap 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.
Multiple vulnerabilities in the implementation of the Lightweight Directory Access Protocol (LDAP) feature in Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.
The vulnerabilities are due to the improper parsing of LDAP packets by an affected device. An attacker could exploit these vulnerabilities by sending an LDAP packet crafted using Basic Encoding Rules (BER) to an affected device. The LDAP packet must have a source IP address of an LDAP server configured on the targeted device. A successful exploit could cause the affected device to reload, resulting in a DoS condition.
Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxosldap
For information about which Cisco FXOS Software and Cisco NX-OS Software releases are vulnerable, see the Fixed Software section of this advisory.
To determine whether a Nexus device is configured for LDAP-based authentication, authorization, and accounting (AAA), administrators can use the show ldap-server CLI command. Output after the following LDAP servers are configured header indicates that a device is vulnerable. For additional information about AAA configuration for FXOS-based devices, customers can refer to the Configuring AAA section of the Cisco FXOS CLI Configuration Guide.
fxos# show ldap-server timeout : 30 port : 0 baseDN : user profile attribute : search filter : cn=$userid use groups : 0 recurse groups : 0 group attribute : memberOf total number of servers : 1 following LDAP servers are configured: ldap1: timeout: 30 port: 389 rootDN: DC=cisco-firepower-aaa1,DC=qalab0,DC=com0,DC=cisco-firepower-aaa2,DC=qalab1,DC=com1,DC=cisco-firepower-aaa3,DC=qalab2,DC=com2,DC=cisco-firepower-aaa4,DC=qalab3,DC=com3,DC=cisco-firepower-aaa5,DC=qalab4,DC=com4,DC=cisco-firepower-aaa6,DC=qalab5,DC=qalab006 enable-ssl: true . . .
To determine whether a Nexus device is configured for the LDAP feature, administrators can use the show running-config | include "ldap-server host" command from the NX-OS CLI and verify that the feature is enabled.
nxos-switch# show running-config | include "ldap-server host"
ldap-server host ...
For additional information on NX-OS LDAP configuration, customers can refer to the Configuring LDAP chapter of the Cisco Security Configuration Guide.
Administrators can check the release of Cisco FXOS Software that is running on a device by using the following commands in the device CLI or by navigating to the Overview tab in the Admin portal. The following example shows the output of the show version CLI command on a device that is running Cisco FXOS Software Release 2.2(2.14), as identified in the Package-Vers field of the command output:
QP4120B1 # scope system QP4120B1 /system # show version FPRM: Running-Vers: 4.2(2.15) Package-Vers: 2.2(2.14) Activate-Status: Ready
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] . . .
Only products listed in the Vulnerable Products section of this advisory are known to be affected by these vulnerabilities.
Cisco has confirmed that these vulnerabilities do not affect the following Cisco products:
Cisco has released free software updates that address the vulnerabilities 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 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.
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 vulnerabilities described in this advisory and the first release that includes the fix for these vulnerabilities. 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:
Firepower 4100 Series Next-Generation Firewalls: CSCvd40241 and CSCvd57308
| Cisco FXOS Software Release | First Fixed Release for These Vulnerabilities | First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories |
|---|---|---|
| 1.1 |
2.0.1.201 |
2.2.2.91 |
| 2.0 | 2.0.1.201 |
2.2.2.91 |
| 2.1 | 2.2.2.54 |
2.2.2.91 |
| 2.2 | 2.2.2.54 |
2.2.2.91 |
| 2.3 | 2.3.1.75 |
2.3.1.110 |
| 2.4 | Not vulnerable | 2.4.1.122 |
Firepower 9300 Security Appliance: CSCvd40241 and CSCvd57308
| Cisco FXOS Software Release | First Fixed Release for These Vulnerabilities | First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories |
|---|---|---|
| 1.1 |
2.0.1.201 | 2.2.2.91 |
| 2.0 | 2.0.1.201 | 2.2.2.91 |
| 2.1 | 2.2.2.54 | 2.2.2.91 |
| 2.2 | 2.2.2.54 | 2.2.2.91 |
| 2.3 | 2.3.1.75 | 2.3.1.110 |
| 2.4 | Not vulnerable | 2.4.1.122 |
MDS 9000 Series Multilayer Switches: CSCve57820 and CSCve02867
| Cisco NX-OS Software Release | First Fixed Release for These Vulnerabilities | First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories |
|---|---|---|
| 5.2 |
6.2(21) | 6.2(27) |
| 6.2 | 6.2(21) | 6.2(27) |
| 7.3 | 8.2(1) | 8.3(2) |
| 8.1 | 8.2(1) | 8.3(2) |
| 8.2 | Not vulnerable | 8.3(2) |
| 8.3 | Not vulnerable | 8.3(2) |
Nexus 3000 Series Switches: CSCve58224 and CSCve02858
| Cisco NX-OS Software Release | First Fixed Release for These Vulnerabilities | First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories |
|---|---|---|
| Prior to 7.0(3)I4 |
7.0(3)I4(7) | 7.0(3)I7(6) |
| 7.0(3)I4 | 7.0(3)I4(7) | 7.0(3)I7(6) |
| 7.0(3)I5 | 7.0(3)I7(1) | 7.0(3)I7(6) |
| 7.0(3)I6 | 7.0(3)I7(1) | 7.0(3)I7(6) |
| 7.0(3)I7 | 7.0(3)I7(1) | 7.0(3)I7(6) |
| 9.2(1) | Not vulnerable |
9.2(2) |
Nexus 3500 Platform Switches: CSCve02871
| Cisco NX-OS Software Release | First Fixed Release for These Vulnerabilities | First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories |
|---|---|---|
| Prior to 6.0(2)A8 |
6.0(2)A8(11) | 6.0(2)A8(11) |
| 6.0(2)A8 |
6.0(2)A8(11) |
6.0(2)A8(11) |
| 7.0(3) | 7.0(3)I7(2) |
7.0(3)I7(6) |
| 9.2 | Not vulnerable | 9.2(2) |
Nexus 7000 and 7700 Series Switches: CSCve57820 and CSCve02867
| Cisco NX-OS Software Release | First Fixed Release for These Vulnerabilities | First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories |
|---|---|---|
| Prior to 6.2 |
6.2(20) | 6.2(22) |
| 6.2 |
6.2(20) | 6.2(22) |
| 7.2 | 7.3(2)D1(1) | 8.2(3) |
| 7.3 | 7.3(2)D1(1) | 8.2(3) |
| 8.0 | 8.2(1) | 8.2(3) |
| 8.1 | 8.2(1) | 8.2(3) |
| 8.2 | Not vulnerable | 8.2(3) |
| 8.3 | Not vulnerable |
8.3(2) |
Nexus 9000 Series Switches in Standalone NX-OS Mode: CSCve02865 and CSCve57816
| Cisco NX-OS Software Release | First Fixed Release for These Vulnerabilities | First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories |
|---|---|---|
| Prior to 7.0(3)I4 |
7.0(3)I4(7) | 7.0(3)I7(6) |
| 7.0(3)I4 | 7.0(3)I4(7) | 7.0(3)I7(6) |
| 7.0(3)I5 | 7.0(3)I7(1) | 7.0(3)I7(6) |
| 7.0(3)I6 | 7.0(3)I7(1) | 7.0(3)I7(6) |
| 7.0(3)I7 | 7.0(3)I7(1) | 7.0(3)I7(6) |
| 9.2(1) | Not vulnerable |
9.2(2) |
UCS 6200 and 6300 Fabric Interconnects: CSCve02855
| Cisco NX-OS Software Release | First Fixed Release for These Vulnerabilities | First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories |
|---|---|---|
| Prior to 3.1 |
3.2(2b) | 3.2(3j) |
| 3.1 | 3.2(2b) | 3.2(3j) |
| 3.2 | 3.2(2b) | 3.2(3j) |
| 4.0 | Not vulnerable |
4.0(2a) |
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.
For help determining the best Cisco NX-OS Software release for Cisco UCS, refer to the Recommended Releases documents in the release notes for the device.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
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
These vulnerabilities were found during internal security testing.
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.
| Version | Description | Section | Status | Date |
|---|---|---|---|---|
| 1.0 | Initial public release. | - | Final | 2019-March-06 |
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.
Vulmon