28 June 2019
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.2202.2 Cisco DNA Center Authentication Bypass Vulnerability 28 June 2019 =========================================================================== 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 | +---------+--------------------------+------------+--------+--------------+ - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to email@example.com and we will forward your request to the appropriate person. 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/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: firstname.lastname@example.org 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). 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