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AUSCERT External Security Bulletin Redistribution
ESB-2019.2202.2
Cisco DNA Center Authentication Bypass Vulnerability
28 June 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco DNA Center
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1848
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190619-dnac-bypass
Revision History: June 28 2019: Updated workaround made available
June 20 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco DNA Center Authentication Bypass Vulnerability
Priority: Critical
Advisory ID: cisco-sa-20190619-dnac-bypass
First Published: 2019 June 19 16:00 GMT
Last Updated: 2019 June 27 17:34 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvj03748
CVE-2019-1848
CWE-668
CVSS Score:
9.3 AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in Cisco Digital Network Architecture (DNA) Center could
allow an unauthenticated, adjacent attacker to bypass authentication and
access critical internal services.
The vulnerability is due to insufficient access restriction to ports
necessary for system operation. An attacker could exploit this
vulnerability by connecting an unauthorized network device to the subnet
designated for cluster services. A successful exploit could allow an
attacker to reach internal services that are not hardened for external
access.
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-20190619-dnac-bypass
Affected Products
o Vulnerable Products
This vulnerability affects Cisco DNA Center Software releases prior to 1.3.
Determining the Cisco DNA Center Software Release
To determine which Cisco DNA Center Software release is running on a
system, administrators can use a compatible browser to log in to the Cisco
DNA Center GUI with HTTPS, click Settings (gear icon) on the DNA Center
home page, and then click About DNA Center . The System version field
indicates which release is currently running on the system.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Workarounds
o A workaround for this vulnerability is available for customers who cannot
upgrade to a fixed release. To coordinate implementation of the workaround,
contact the Cisco Technical Assistance Center (TAC) .
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 DNA Center Software Release 1.3.
Cisco DNA Center is a dedicated physical appliance that is purchased from
Cisco with the DNA Center ISO image preinstalled. System updates are
available for installation from the Cisco cloud and are not available for
download from the Software Center on Cisco.com. To upgrade to a fixed
release of Cisco DNA Center Software, administrators can use the System
Updates feature of the software. For more information, refer to the Cisco
Digital Network Architecture Center Administrator Guide and the release
notes for the release to be installed.
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 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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190619-dnac-bypass
Revision History
o +---------+--------------------------+------------+--------+--------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+------------+--------+--------------+
| 1.1 | Updated workaround | Workaround | Final | 2019-June-27 |
| | availability. | | | |
+---------+--------------------------+------------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2019-June-19 |
+---------+--------------------------+------------+--------+--------------+
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