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AUSCERT External Security Bulletin Redistribution
ESB-2019.3875
Cisco Aironet Access Points and Catalyst 9100 Access Points
CAPWAP Denial of Service Vulnerability
17 October 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Aironet Access Points
Cisco Catalyst 9100 Access Points
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-15264
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191016-airo-capwap-dos
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Cisco Aironet Access Points and Catalyst 9100 Access Points CAPWAP Denial of
Service Vulnerability
Priority: High
Advisory ID: cisco-sa-20191016-airo-capwap-dos
First Published: 2019 October 16 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvo40697
CVE-2019-15264
CWE-400
CVSS Score:
7.4 AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the Control and Provisioning of Wireless Access Points
(CAPWAP) protocol implementation of Cisco Aironet and Catalyst 9100 Access
Points (APs) could allow an unauthenticated, adjacent attacker to cause an
affected device to restart unexpectedly, resulting in a denial of service
(DoS) condition.
The vulnerability is due to improper resource management during CAPWAP
message processing. An attacker could exploit this vulnerability by sending
a high volume of legitimate wireless management frames within a short time
to an affected device. A successful exploit could allow the attacker to
cause a device to restart unexpectedly, resulting in a DoS condition for
clients associated with the AP.
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-20191016-airo-capwap-dos
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable software release:
Aironet 1540 Series APs
Aironet 1560 Series APs
Aironet 1800 Series APs
Aironet 2800 Series APs
Aironet 3800 Series APs
Aironet 4800 APs
Catalyst 9100 APs
Note: For Catalyst 9100 APs, Release 8.9.100.0 is the first supported
release.
For information about which software releases are vulnerable, see the Fixed
Software section of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
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 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.
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:
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
Customers are advised to 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-20191016-airo-capwap-dos : Cisco Aironet Access Points and
Catalyst 9100 Access Points CAPWAP Denial of Service Vulnerability
cisco-sa-20191016-airo-pptp-dos : Cisco Aironet Access Points
Point-to-Point Tunneling Protocol Denial of Service Vulnerability
cisco-sa-20191016-airo-unauth-access : Cisco Aironet Access Points
Unauthorized Access Vulnerability
cisco-sa-20191016-wlc-ssh-dos : Cisco Wireless LAN Controller Secure
Shell Denial of Service Vulnerability
In the following table, 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 collection of
advisories and which release includes fixes for those vulnerabilities.
Cisco Aironet AP First Fixed Release Recommended Release for All
Software Major for This Vulnerabilities Described in the
Release Vulnerability Collection of Advisories
8.2 8.5.151.0 8.5.151.0
8.3 8.5.151.0 8.5.151.0
8.4 8.5.151.0 8.5.151.0
8.5 8.5.151.0 8.5.151.0
8.6 8.8.125.0 8.8.125.0
8.7 8.8.125.0 8.8.125.0
8.8 8.8.125.0 8.8.125.0
8.9 8.9.111.0 8.9.111.0
8.10 Not vulnerable Not vulnerable
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 by Xiaomei Jia of Cisco during internal
security testing.
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20191016-airo-capwap-dos
Revision History
o +---------+--------------------------+---------+--------+-----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+-----------------+
| 1.0 | Initial public release. | - | Final | 2019-October-16 |
+---------+--------------------------+---------+--------+-----------------+
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