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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.1603 Cisco Embedded Wireless Controller with Catalyst Access Points IP Flood Denial of Service Vulnerability 14 April 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Embedded Wireless Controller Publisher: Cisco Systems Operating System: Cisco Resolution: Patch/Upgrade CVE Names: CVE-2022-20622 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-ip-flood-dos-6hxxENVQ Comment: CVSS (Max): 8.6 CVE-2022-20622 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H) CVSS Source: Cisco Systems Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Embedded Wireless Controller with Catalyst Access Points IP Flood Denial of Service Vulnerability Priority: High Advisory ID: cisco-sa-ap-ip-flood-dos-6hxxENVQ First Published: 2022 April 13 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvx88847 CVE Names: CVE-2022-20622 CWEs: CWE-770 Summary o A vulnerability in IP ingress packet processing of the Cisco Embedded Wireless Controller with Catalyst Access Points Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, causing a denial of service (DoS) condition. The device may experience a performance degradation in traffic processing or high CPU usage prior to the unexpected reload. This vulnerability is due to improper rate limiting of IP packets to the management interface. An attacker could exploit this vulnerability by sending a steady stream of IP traffic at a high rate to the management interface of the affected device. A successful exploit could allow the attacker to cause the device to reload. 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-ap-ip-flood-dos-6hxxENVQ Affected Products o Vulnerable Products This vulnerability affects Cisco devices if they are running a vulnerable release of Cisco Embedded Wireless Controller with Catalyst Access Points Software. Note: To be vulnerable, devices must have the default configuration. For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect the following Cisco products: Catalyst 9800 Embedded Wireless Controller for Catalyst 9300, 9400, and 9500 Series Switches IOS Software IOS XE Software IOS XR Software Meraki products NX-OS Software Wireless LAN Controller (WLC) AireOS Software 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 with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels. 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. The Cisco Support and Downloads page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. 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 The process to upgrade an access point (AP) requires administrators to upgrade the wireless controller to which the AP is registered. Customers are advised to upgrade to an appropriate fixed software release as indicated in the following table(s): Cisco Embedded Wireless Controller with Catalyst Access First Fixed Release Points Software Release 16.12 and earlier Not affected. 17.2 Not affected. 17.3 17.3.4 17.4 Migrate to a fixed release. 17.5 Migrate to a fixed release. 17.6 17.6.1 The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory. Exploitation and Public Announcements o The Cisco 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 by Miroslav Popovic of Cisco 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-ap-ip-flood-dos-6hxxENVQ Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2022-APR-13 | +----------+---------------------------+----------+--------+--------------+ - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYldh1uNLKJtyKPYoAQjj7A/9EpVRy8zOcc4xauJykUTN2JTSwg3JmGAf n6h1eECsrWf7Q2z8k5EAw0cx6WldZpeizMQ9ZX4M5Mu5LdlmPyYX9Hl7uyOSbLbd pMkL0Qi5yJXhD5TnnCrBNkSWaX9nwOFRZ+eXhGJRQSiF2SeOccGui5Iml9CecCfw ves3mTDzv4gz9r7plLz8lSUVHZrR313iu5x5ibfnfVr4+mLXjRmF2Z5+krVz4For 6fdFPinX9/WNU6j8XwL2KEQNyho9xnWu4SoqwZfnoXcvYpmQ7tZqa0e0BdZrQOro TCAHygacC2GrAJavDDZXlhOlC4NqoTrrBlpV5dZrJPWVmA8iY0fLYRcQYBcHdOfn kC8Dn1wt4t9MRVAFJCdLy2njqVNf4Fi87KCWt3kEmj6bUAvW5mHOhIGg6tVU6O/P jftVwbGhyWqpyQNTmyR7Refooc6+Q8UczBKhgCZAvBSSG38yEvvPJPvUwO7ze4lP M7BUciLK88GJUMMeyqcAAcHx7jtZsOGeU6oxmazsWajD0h4F0kr9U0o6bfbBOdya lcR8jVfUcogI8ODA5gNZDktsmaZTOJHEXX+/c3rsF6ID8pRhAdoBH5nl1gU5LWFG 2CFofJ5NsTynsPMBlz3cXB9D9EwymWsQCTO/FpD80Ux3l02O1OjPAP3KSl38eeGv 0Ryvb5Gg84s= =0D2H -----END PGP SIGNATURE-----