Summary

• 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://sec.cloudapps.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

• 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 Ip	MAC Address	Group Name	Multicast IPv4	Multicast IPv6	Status	PMTU
  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

• 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

• There are no workarounds that address this vulnerability.

Fixed Software

• 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.

   

  Only this advisory All Critical and High advisories All advisories

   

Exploitation and Public Announcements

• 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

• This vulnerability was found during the resolution of a Cisco TAC support case.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-c9800-mob-dos-342YAc6J

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	—	Final	2022-SEP-28

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