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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4844 Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Mobility Denial of Service Vulnerability 29 September 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Catalyst 9800-CL Wireless Controllers for Cloud Catalyst 9300,9400 Embedded Wireless Controller 9500 Series Switches Catalyst 9800 Series Wireless Controllers Publisher: Cisco Systems Operating System: Cisco Resolution: Patch/Upgrade CVE Names: CVE-2022-20856 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-c9800-mob-dos-342YAc6J Comment: CVSS (Max): 8.6 CVE-2022-20856 (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 IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Mobility Denial of Service Vulnerability Priority: High Advisory ID: cisco-sa-c9800-mob-dos-342YAc6J First Published: 2022 September 28 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCwa92678 CVE Names: CVE-2022-20856 CWEs: CWE-664 Summary o A vulnerability in the processing of Control and Provisioning of Wireless Access Points (CAPWAP) Mobility messages in Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to a logic error and improper management of resources related to the handling of CAPWAP Mobility messages. An attacker could exploit this vulnerability by sending crafted CAPWAP Mobility packets to an affected device. A successful exploit could allow the attacker to exhaust resources on the affected device. This would cause the device to reload, 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-c9800-mob-dos-342YAc6J This advisory is part of the September 2022 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2022 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication. Affected Products o Vulnerable Products This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco IOS XE Software and are part of a Mobility group (disabled by default): Catalyst 9800-CL Wireless Controllers for Cloud Catalyst 9800 Embedded Wireless Controller for Catalyst 9300, 9400, and 9500 Series Switches Catalyst 9800 Series Wireless Controllers For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Determine the Device Configuration A device is affected by this vulnerability if it is part of a Mobility group. To determine whether a device is part of a Mobility group, use the command show wireless mobility summary . At the end of the output generated by this command, the Mobility peers are listed under Controllers configured in the Mobility Domain , including the current controller. If the only entry is the current device, then it is not part of a Mobility group and is not affected. If there are devices listed other than the current device, then it is part of a Mobility group and is affected. The example output below (layout changed for readability purposes) shows two devices: the device where the command was issued and its Mobility peer. Therefore, the example device is part of a Mobility group and is affected. WLC#show wireless mobility summary Mobility Summary Wireless Management VLAN: 999 Wireless Management IP Address: 9.9.9.9 Wireless Management IPv6 Address: Mobility Control Message DSCP Value: 48 Mobility High Cipher : False Mobility DTLS Supported Ciphers: TLS_ECDHE_RSA_AES128_GCM_SHA256, TLS_RSA_AES256_GCM_SHA384, TLS_RSA_AES128_CBC_SHA Mobility Keepalive Interval/Count: 10/3 Mobility Group Name: default Mobility Multicast Ipv4 address: 0.0.0.0 Mobility Multicast Ipv6 address: :: Mobility MAC Address: 001e.ffff.ffff Mobility Domain Identifier: 0x34ac Controllers configured in the Mobility Domain: IP Public MAC Address Group Multicast Multicast Status PMTU Ip Name IPv4 IPv6 9.9.9.9 N/A 001e.ffff.ffff default 0.0.0.0 :: N/A N/A 9.9.9.10 9.9.9.10 001e.ffff.fffe default 0.0.0.0 :: Up 1385 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: Embedded Wireless Controller on Catalyst Access Points IOS Software IOS XR Software Meraki products NX-OS Software Wireless LAN Controller (WLC) AireOS Software Indicators of Compromise o The Cisco Security Indicators of Compromise Reference Guide lists commonly observed IoCs, which can help identify devices that may have been impacted by the vulnerability disclosed in this Cisco security advisory. Exploitation of this vulnerability could cause a crash of the mobilityd process on an affected device. When a device has experienced a crash of the mobilityd process, the following messages may be seen in the crash log bundle: Feb 15 19:15:43.331: %ID_MANAGER-3-INVALID_ID: Chassis 1 R0/0: mobilityd: bad id in id_get (Out of IDs!) (id: 0x00000000) 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. Cisco IOS and IOS XE Software To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker . This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory ("First Fixed"). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities that are described in all the advisories that the Software Checker identifies ("Combined First Fixed"). To use the tool, go to the Cisco Software Checker page and follow the instructions. Alternatively, use the following form to determine whether a release is affected by any Cisco Security Advisory. To use the form, follow these steps: 1. Choose which advisories the tool will search-only this advisory, only advisories with a Critical or High Security Impact Rating (SIR) , or all advisories. 2. Enter a release number-for example, 15.9(3)M2 or 17.3.3. 3. Click Check 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 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 Cisco Event Response: September 2022 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-c9800-mob-dos-342YAc6J 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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBYzUrhskNZI30y1K9AQg09BAAqv66Pa7Qr4hf2acFXjNSL5j3pdDPOx+p nwCDI+shn87ub7TgxZ9ZtEKvaFO0CE6ndok/z52rJQu9QgQU9wvqeXrVCmFxHKwF +rqRhr0jEX2QgAdICz/1vN/d+mCw2R2FE+VgHeL9U6L9RSnHiloJY81jsG08wo67 kxmcCUPOUV5/WzCabTrsq628bfRXjefjOrPCGMxec8ihXpzRNNmILOddVZFO/O3A z9Z98Pvqs77FvqksLEPUNyGvgtMgq1T1Ak869ZAwCO6Vm4w+PlITsQlIzH7SljOX lSaIpquqqyGnF5SEPdGKDITT1401EpexxX3253PqVTNASN6NqJnMmgy1ohJs+BE7 0RrcGuctjSXmREgqUOWcBj76LtQogsdJiLrp22+aY1Mcly0cREvN4LkUyHfC5MyK 9NFGpbEG3vPcT/5sEMFlegLHMMwjrj7cVcQYl+VOjjRj7xOMrIy0fpDsl8ZxPh/L yEpEFjdQ4OOhl2eVzhKHic5jhmXrHsaYJWiKdkvQj8Zw9DtHakcCKOmg6looWfmk mwk4fbV8BqQOetz4Mj89UYRhDRI4ZOdbYu4ystvYsrymjXSiXiRVjMgVOENndmqb qNpIYwwRlpZdwOpGEwnDCg3uzPNFNRZ01XWGnUtWEFJO+cADb+USl3reJPFB4vvv IRvNDIt+ZIc= =XzNQ -----END PGP SIGNATURE-----