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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4180.2 Cisco Wireless LAN Controller HTTP Parsing Engine Denial of Service Vulnerability 12 May 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Wireless LAN Controller Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-15276 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-wlc-dos Revision History: May 12 2020: Vendor released update 1.2 November 7 2019: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Wireless LAN Controller HTTP Parsing Engine Denial of Service Vulnerability Priority: High Advisory ID: cisco-sa-20191106-wlc-dos First Published: 2019 November 6 16:00 GMT Last Updated: 2020 May 11 15:58 GMT Version 1.2: Final Workarounds: No workarounds availableCisco Bug IDs: CSCvp92098 CVE-2019-15276 CWE-20 CVSS Score: 7.7 AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X Summary o A vulnerability in the web interface of Cisco Wireless LAN Controller Software could allow a low-privileged, authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability exists due to a failure of the HTTP parsing engine to handle specially crafted URLs. An attacker could exploit this vulnerability by authenticating with low privileges to an affected controller and submitting the crafted URL to the web interface of the affected device. Conversely, an unauthenticated attacker could exploit this vulnerability by persuading a user of the web interface to click the crafted URL. A successful exploit could allow the attacker to cause an unexpected restart of the device, resulting in a DoS condition. 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-20191106-wlc-dos Affected Products o Vulnerable Products This vulnerability affects Cisco Wireless LAN Controllers running Software Release 8.4 and later, and earlier than 8.10. 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 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 In the following table, the left column lists major Cisco software releases. The right column indicates the recommended major release which includes the fix for the vulnerability described in this advisory. Cisco Wireless LAN Controller Major Software Release First Fixed Release Prior to 8.0 Not vulnerable. 8.0 Not vulnerable. 8.1 Not vulnerable. 8.2 Not vulnerable. 8.3 Not vulnerable. 8.4 8.5.160.0 8.5 8.5.160.0 8.6 8.8.130.0 8.7 8.8.130.0 8.8 8.8.130.0 8.9 8.10 8.10 Not vulnerable. 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 independent security researcher SecuNinja for reporting this vulnerability. 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. Action Links for This Advisory o Snort Rule 52126 URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20191106-wlc-dos Revision History o +---------+-----------------------------+----------+--------+-------------+ | Version | Description | Section | Status | Date | +---------+-----------------------------+----------+--------+-------------+ | 1.2 | Updated Fixed Software | Fixed | Final | 2020-MAY-11 | | | table with 8.8 release. | Software | | | +---------+-----------------------------+----------+--------+-------------+ | 1.1 | Updated Fixed Software | Fixed | Final | 2019-DEC-11 | | | table with 8.5 release. | Software | | | +---------+-----------------------------+----------+--------+-------------+ | 1.0 | Initial public release. | - | Final | 2019-NOV-06 | +---------+-----------------------------+----------+--------+-------------+ - --------------------------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 auscert@auscert.org.au 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: 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). 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