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AUSCERT External Security Bulletin Redistribution
ESB-2019.1507.2
Cisco Nexus 9000 Series Fabric Switches Application Centric
Infrastructure Mode Default SSH Key Vulnerability
10 May 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Nexus 9000 Series Fabric Switches
Publisher: Cisco Systems
Operating System: Cisco NX-OS
Impact/Access: Root Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1804
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-nexus9k-sshkey
Revision History: May 10 2019: Added software release 13.2(6i) as fixed
May 2 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode
Default SSH Key Vulnerability
Priority: Critical
Advisory ID: cisco-sa-20190501-nexus9k-sshkey
First Published: 2019 May 1 16:00 GMT
Last Updated: 2019 May 9 12:49 GMT
Version 1.2: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvo80686
CVE-2019-1804
CWE-310
CVSS Score:
9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the SSH key management for the Cisco Nexus 9000 Series
Application Centric Infrastructure (ACI) Mode Switch Software could allow
an unauthenticated, remote attacker to connect to the affected system with
the privileges of the root user.
The vulnerability is due to the presence of a default SSH key pair that is
present in all devices. An attacker could exploit this vulnerability by
opening an SSH connection via IPv6 to a targeted device using the extracted
key materials. An exploit could allow the attacker to access the system
with the privileges of the root user. This vulnerability is only
exploitable over IPv6; IPv4 is not vulnerable.
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190501-nexus9k-sshkey
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a Cisco Nexus 9000 Series ACI Mode Switch Software Release prior to 13.2
(6i) or 14.1(1i):
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
Determining the Cisco NX-OS Software Release
Administrators can determine the release of Cisco NX-OS Software running on
a device by using the show version command in the device CLI. The following
example identifies the 11.2(2) Release:
nxos-n9k-aci# show version
Cisco Nexus Operating System (NX-OS) Software
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 N/A
kickstart: version 11.2(2) [build 11.2(1.184)]
system: version 11.2(2) [build 11.2(1.184)]
.
.
.
Determining the Cisco Application Policy Infrastructure Controller Software
Release
There is a one-to-one mapping between the software for Cisco Application
Policy Infrastructure Controller (APIC) and Cisco Nexus 9000 Series Fabric
Switches in ACI mode. To determine which Cisco APIC Software release is
running on a device, administrators can disregard the leftmost digit of the
Cisco NX-OS Software version number. In the preceding example, the output
shows Cisco NX-OS Software version 11.2(2) , which maps to Cisco APIC
Software Release 1.2(2) .
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
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 3000 Series Switches
Nexus 3500 Platform Switches
Nexus 3600 Platform Switches
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Nexus 7700 Series Switches
Nexus 9000 Series Switches in standalone NX-OS mode
Nexus 9500 R-Series Switching Platform
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o 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.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 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.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.
Fixed Releases
This vulnerability is fixed in Cisco Nexus 9000 Series ACI Mode Switch
Software Releases 13.2(6i), 14.1(1i) , and later.
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
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.
Exploitation and Public Announcements
o 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
o Cisco would like to thank Oliver Matula from ERNW Enno Rey Netzwerke GmbH
in cooperation with ERNW Research GmbH.
Cisco Security Vulnerability Policy
o 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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190501-nexus9k-sshkey
Revision History
o +---------+--------------------+------------------+---------+-------------+
| Version | Description | Section | Status | Date |
+---------+--------------------+------------------+---------+-------------+
| | Added software | Vulnerable | | |
| 1.2 | release 13.2(6i) | Products and | Final | 2019-May-09 |
| | as fixed. | Fixed Software | | |
+---------+--------------------+------------------+---------+-------------+
| | Changed the | Vulnerable | | |
| 1.1 | product name to be | Products | Interim | 2019-May-02 |
| | more specific. | | | |
+---------+--------------------+------------------+---------+-------------+
| 1.0 | Initial public | - | Interim | 2019-May-01 |
| | release. | | | |
+---------+--------------------+------------------+---------+-------------+
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