Cisco Security Advisory
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CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
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A vulnerability in 802.11 association request frame processing for the Cisco Aironet 1560, 2800, and 3800 Series Access Points could allow an unauthenticated, Layer 2 radio frequency (RF) adjacent attacker to cause the Access Point (AP) to reload, resulting in a denial of service (DoS) condition.
The vulnerability is due to insufficient frame validation of the 802.11 association request. An attacker could exploit this vulnerability by sending a malformed 802.11 association request to the targeted device. An exploit could allow the attacker to cause the AP to reload, resulting in a DoS condition while the AP is reloading.
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-20171101-aironet1
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Vulnerable Products
This vulnerability affects the following Cisco products running either the Lightweight AP Software or Mobility Express image:
- Aironet 1560 Series Access Points
- Aironet 2800 Series Access Points
- Aironet 3800 Series Access Points
Determine the Software Version
To determine which version of Cisco Aironet Series Access Point Software is running on a device, administrators can use the controller web interface or the CLI.
To use the web interface, log in to the web interface, choose Management > Software Update and then refer to the release number that appears at the top of the page.
To use the CLI, issue the show version command and then refer to the value in the AP Running Image field of the command output. The following example shows the output of the command for a device running software version 8.3.102.0:
AP# show version . . . cisco AIR-AP3802E-B-K9 ARMv7 Processor rev 1 (v7l) with 1030528/668540K bytes of memory. Processor board ID RFDPP1BS497 AP Running Image : 8.3.102.0 Primary Boot Image : 8.3.102.0 . . .
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Aironet 1800 Series Access Points or any Aironet Access Point running Cisco IOS Software.
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There are no workarounds that address this vulnerability.
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Cisco has released free software updates that address the vulnerability described in this advisory. 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: http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.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.
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 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: 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-sa-20171101-aironet1: Cisco Aironet 1560, 2800, and 3800 Series Access Point Platforms 802.11 Denial of Service Vulnerability
- cisco-sa-20171101-aironet2: Cisco Aironet 1560, 2800, and 3800 Series Access Point Platforms Extensible Authentication Protocol Denial of Service Vulnerability
- cisco-sa-20171101-wlc1: Cisco Wireless LAN Controller Simple Network Management Protocol Memory Leak Denial of Service Vulnerability
- cisco-sa-20171101-wlc2: Cisco Wireless LAN Controller 802.11v Basic Service Set Transition Management Denial of Service Vulnerability
In the following table, the left column lists releases of Cisco software. The center column indicates the first recommended release that includes the fix for this vulnerability. The right column indicates the first recommended release that includes fixes for all the vulnerabilities described in this collection of advisories.
Cisco Aironet 1560, 2800, 3800 Access Points Recommended Fixed Release for This Vulnerability Recommended Release for This Vulnerability and All Vulnerabilities Described in the Collection of Advisories Prior to 8.0
Not applicable
8.0.152.0 8.0 Not applicable 8.0.152.0 8.1
Not applicable
8.2.166.0
8.2 8.2.166.0 8.2.166.0 8.3 8.3.133.0 8.3.133.0 8.4 8.4.100.0 8.4.100.0 8.5 8.5.105.0
8.5.110.0 (future release)
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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.
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This vulnerability was found during internal security testing.
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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.
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Show LessVersion Description Section Status Date 1.1 Releases 8.2 and 8.3 were rebuilt to address customer issues. The recommended releases have been updated. Fixed Software Final 2017-November-02 1.0 Initial public release. — Final 2017-November-01
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