ESB-2021.2146 – [Cisco] Cisco DNA Center: Multiple vulnerabilities

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AUSCERT External Security Bulletin Redistribution

ESB-2021.2146
Cisco DNA Center Certificate Validation Vulnerability
17 June 2021

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AusCERT Security Bulletin Summary
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Product: Cisco DNA Center
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Access Confidential Data — Remote/Unauthenticated
Reduced Security — Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1134

Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-dnac-certvalid-USEj2CZk

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Cisco DNA Center Certificate Validation Vulnerability

Priority: High
Advisory ID: cisco-sa-dnac-certvalid-USEj2CZk
First Published: 2021 June 16 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvt16845
CVE Names: CVE-2021-1134
CWEs: CWE-295

CVSS Score:
7.4 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:X/RL:X/RC:X

Summary

o A vulnerability in the Cisco Identity Services Engine (ISE) integration
feature of the Cisco DNA Center Software could allow an unauthenticated,
remote attacker to gain unauthorized access to sensitive data.

The vulnerability is due to an incomplete validation of the X.509
certificate used when establishing a connection between DNA Center and an
ISE server. An attacker could exploit this vulnerability by supplying a
crafted certificate and could then intercept communications between the ISE
and DNA Center. A successful exploit could allow the attacker to view and
alter sensitive information that the ISE maintains about clients that are
connected to the network.

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-dnac-certvalid-USEj2CZk

Affected Products

o Vulnerable Products

This vulnerability affects Cisco DNA Center Software releases earlier than
2.2.2.1 when they are integrated with ISE by using the Cisco Platform
Exchange Grid (pxGrid) service, which is disabled by default.

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 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 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 releases 2.2.2.1 ^
1 and 2.2.2.3 and later.

1. Limited Availability Release

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
DNA Center Upgrade Guide 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-dnac-certvalid-USEj2CZk

Revision History

o +———-+—————————+———-+——–+————–+
| Version | Description | Section | Status | Date |
+———-+—————————+———-+——–+————–+
| 1.0 | Initial public release. | – | Final | 2021-JUN-16 |
+———-+—————————+———-+——–+————–+

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you do not know who that is, please send an email to auscert@auscert.org.au
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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT’s members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation’s
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author’s website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

https://www.auscert.org.au/bulletins/

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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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