A vulnerability in 802.11 Wireless Multimedia Extensions (WME) action frame processing in Cisco Wireless LAN Controller (WLC) Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. The vulnerability is due to incomplete input validation of the 802.11 WME packet header. An attacker could exploit this vulnerability by sending malformed 802.11 WME frames to a targeted device. A successful exploit could allow the attacker to cause the WLC to reload unexpectedly. 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-20170405-wlc
(5500-4) >show sysinfo Manufacturer's Name.............................. Cisco Systems Inc. Product Name..................................... Cisco Controller Product Version.................................. 8.3.102.0 Bootloader Version............................... 1.0.1 Field Recovery Image Version..................... 6.0.182.0 Firmware Version................................. FPGA 1.3, Env 1.6, USB console 1.27 Build Type....................................... DATA + WPS . . .
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 upgrade 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: http://www.cisco.com/en/US/support/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
Customers should upgrade to an appropriate release as indicated in the table in this section. To help ensure a complete upgrade solution, consider that this advisory is part of a collection that includes the following advisories:
| Cisco Wireless LAN Controller | First Fixed Release for This Vulnerability | Recommended Release for This Vulnerability and All Vulnerabilities Described in the Collection of Advisories |
|---|---|---|
| Prior to 8.0 | Vulnerable; migrate to 8.0.140.0 |
8.0.140.0 |
| 8.0 | 8.0.140.0 |
8.0.140.0 |
| 8.1 | Vulnerable; migrate to 8.2.130.0 | 8.2.141.0 |
| 8.2 | 8.2.130.0 | 8.2.141.0 |
| 8.3 | 8.3.111.0 | 8.3.112.0 |
| 8.4 | Not vulnerable | 8.4.100.0 (future release) |
| Version | Description | Section | Status | Date |
|---|---|---|---|---|
| 1.1 | Metadata update. | - | Final | 2017-October-06 |
| 1.0 | Initial public release. | - | Final | 2017-April-05 |
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