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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4816 Cisco Wireless LAN Controller AireOS Software FIPS Mode Denial of Service Vulnerability 29 September 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Wireless LAN Controller Publisher: Cisco Systems Operating System: Cisco Resolution: Patch/Upgrade CVE Names: CVE-2022-20769 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-dos-mKGRrsCB Comment: CVSS (Max): 7.4 CVE-2022-20769 (CVSS:3.1/AV:A/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:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Wireless LAN Controller AireOS Software FIPS Mode Denial of Service Vulnerability Priority: High Advisory ID: cisco-sa-wlc-dos-mKGRrsCB First Published: 2022 September 28 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCwa40778 CVE Names: CVE-2022-20769 CWEs: CWE-787 Summary o A vulnerability in the authentication functionality of Cisco Wireless LAN Controller (WLC) AireOS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient error validation. An attacker could exploit this vulnerability by sending crafted packets to an affected device. A successful exploit could allow the attacker to cause the wireless LAN controller to crash, resulting in a DoS condition. Note : This vulnerability affects only devices that have Federal Information Processing Standards (FIPS) mode enabled. 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-wlc-dos-mKGRrsCB Affected Products o Vulnerable Products This vulnerability affects Cisco devices if they are running a vulnerable release of Cisco WLC AireOS Software and they have FIPS mode enabled. For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Determine Whether FIPS Mode is Enabled To determine whether FIPS mode is enabled, use the show switchconfig CLI command. If FIPS prerequisite features is enabled, as shown in the following example, the device is considered vulnerable: wlc> show switchconfig 802.3x Flow Control Mode......................... Disable FIPS prerequisite features....................... Enabled WLANCC prerequisite features..................... Enabled UCAPL prerequisite features...................... Disabled secret obfuscation............................... Enabled 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-CL Wireless Controllers for Cloud Catalyst 9800 Embedded Wireless Controllers for Catalyst 9300, 9400, and 9500 Series Switches Catalyst 9800 Series Wireless Controllers Embedded Wireless Controllers on Catalyst Access Points Mobility Express 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 In the following table(s), the left column lists Cisco software releases. The center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by all the vulnerabilities described in this bundle of advisories and which release includes fixes for those vulnerabilities. Cisco WLC AireOS Release First Fixed Release 8.9 and earlier Migrate to a fixed release. 8.10 and later 8.10.171.0 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 during the resolution of a Cisco TAC support case. 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. Related to This Advisory o September-2022-WLC Bundle URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-dos-mKGRrsCB Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2022-SEP-28 | +----------+---------------------------+----------+--------+--------------+ - --------------------------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: https://auscert.org.au/gpg-key/ iQIVAwUBYzTppskNZI30y1K9AQjHAhAAhyhaB6XfpqNJ38HC9+rTCyVGtlKA0QJ7 F4wZCH3/mawisaHU3Ap0JmYew0BImJD6kyi0h6bHrMwXgosQCIQBDgYaLspfyezm 5xd+kJYuoKc0K5NfzGpvvnWmeSpDON7mwmeBRMpZDAqtJvdMwXG+SMCqKoDedkpf FNzDofJLvPf56xqt4bARXd6HjZQwPy9VN1QjoW8jehO0v/Ifcr5MUKO0BuWALJoF 3Z25SHcehVDWJULigUbbKIOQ3ELe+jme1gn2konaTL0FDwmepXymjSPOQwT1O5Ht 5W8lP2gK63tBZVbSxb+N6wwsNOD8zxY29GO5kIhulQY6H3R6UcRuq6UNdGw4/Tgs wHOqXW3wbh85bnKp3FpeS8ZNpxwdH7t5l0iwYD684aTAO0JcmrtVV7bDN0SApvDa U6FXk8FI6ZfYKMFuozG8t23LfTUr8kVrImwfGf3sqUPMrUJfW5VabLAbQC1HJ8PV esyniJvGES2YggekT7rKeU53DKFRH7lPFuSe5TPJTuEBOLu1awA4sL6VdwR3860W DmCOZiTdCqME3iTMJrd4h2R5RVHNQH4Enx6UrhxbN3lNi5yGnfIyTDzh5MkMSf7e UrujbfEKmJfJwHRa2YR9C6X3wjwnEgNDaNfLbcwJlX6usKeEv9wTm+pr96QLMdF2 F0A28EaC0Zs= =LMcD -----END PGP SIGNATURE-----