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AUSCERT External Security Bulletin Redistribution
Cisco Network Assurance Engine CLI Access with Default
13 February 2019
AusCERT Security Bulletin Summary
Product: Cisco Network Assurance Engine
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Console/Physical
CVE Names: CVE-2019-1688
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Cisco Network Assurance Engine CLI Access with Default Password Vulnerability
Advisory ID: cisco-sa-20190212-nae-dos
First Published: 2019 February 12 16:00 GMT
Version 1.0: Final
Cisco Bug IDs: CSCvo18229
o A vulnerability in the management web interface of Cisco Network Assurance
Engine (NAE) could allow an unauthenticated, local attacker to gain
unauthorized access or cause a Denial of Service (DoS) condition on the
The vulnerability is due to a fault in the password management system of
NAE. An attacker could exploit this vulnerability by authenticating with
the default administrator password via the CLI of an affected server. A
successful exploit could allow the attacker to view potentially sensitive
information or bring the server down, causing a DoS condition.
Cisco has released software updates that address this vulnerability. There
are workarounds that address this vulnerability.
This advisory is available at the following link:
o Vulnerable Products
This vulnerability affects Cisco Network Assurance Engine (NAE) Release 3.0
(1). The default password condition only affects new installations of
Determining the NAE Software Release
To determine the software release that is running on the server,
administrators can log in to the web interface using the http(s)://
<system-ip> access URL and navigate to the Gear > About Network Assurance
Engine screen. The release information is displayed as follows:
Cisco Network Assurance Engine
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
o Customers upgrading from earlier versions will not be affected by this
vulnerability. However, any user passwords changed from the web management
interface in the affected release will not be propagated to the CLI. The
old password, from before the change in the web management interface, would
still be associated to the username in the CLI. See the Workarounds section
for information on how to synchronize the passwords again.
o The default administrator password can be changed from the CLI by setting a
new password with the passwd command. Customers wishing to implement this
workaround should contact Cisco TAC (Technical Assistance Center) so the
default password can be entered securely over a remote support session.
This will need to be done for all nodes in the cluster.
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
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
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:
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
This vulnerability is fixed in Cisco NAE Release 3.0(1a).
To fix the vulnerability, the administrator password should be changed from
the management web interface after upgrading to version 3.0(1a).
Customers can download Cisco Network Assurance Software from the Software
Center on Cisco.com by doing the following:
Click Browse all.
Navigate to Data Center Analytics > Network Assurance Engine.
Access Cisco NAE releases by using the left pane of the software
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.
o This vulnerability was found during internal security testing.
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.
Subscribe to Cisco Security Notifications
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | - | Final | 2019-February-12 |
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