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AUSCERT External Security Bulletin Redistribution
ESB-2020.3271
Multiple Cisco Aironet Access Point vulnerabilities
25 September 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Aironet Access Points
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3560 CVE-2020-3559 CVE-2020-3552
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-dos-h3DCuLXw
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-ethport-dos-xtjTt8pY
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-dos-VHr2zG9y
Comment: This bulletin contains three (3) Cisco Systems security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Aironet Access Point Authentication Flood Denial of Service
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-aironet-dos-h3DCuLXw
First Published: 2020 September 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvr68273
CVE-2020-3559
CWE-400
CVSS Score:
6.8 AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in Cisco Aironet Access Point (AP) Software could allow an
unauthenticated, remote attacker to cause an affected device to reload.
The vulnerability is due to improper handling of clients that are trying to
connect to the AP. An attacker could exploit this vulnerability by sending
authentication requests from multiple clients to an affected device. A
successful exploit could allow the attacker to cause the affected device to
reload.
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-aironet-dos-h3DCuLXw
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
devices:
Aironet 1800 Series APs
Business 100 Series APs
Business 200 Series APs
Integrated Access Point on 1100 Integrated Services Routers
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory. See
the Details section in the bug ID(s) at the top of this advisory for the
most complete and current information.
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 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.
Fixed Releases
To upgrade the APs, administrators must upgrade the wireless controllers
that manage the APs.
At the time of publication, the release information in the following table
(s) was accurate. See the Details section in the bug ID(s) at the top of
this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column
indicates whether a release was affected by the vulnerability described in
this advisory and which release included the fix for this vulnerability.
Cisco APs Managed by Cisco Wireless LAN Controller
Cisco Wireless LAN Controller Software Major First Fixed Release for This
Release Vulnerability
8.5 and earlier 8.5.160.0
8.6 8.8.130.0
8.7 8.8.130.0
8.8 8.8.130.0
8.9 8.10.112.0
8.10 8.10.112.0
Cisco APs Managed by Cisco Catalyst 9800 Wireless Controller
Cisco Catalyst 9800 Wireless Controller First Fixed Release for This
Software Major Release Vulnerability
16.12 and earlier 16.12.4a
17 Not vulnerable.
Cisco Business APs Software
Cisco Business Access Point Software Major First Fixed Release for This
Release Vulnerability
10.0 10.1.1.0
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-aironet-dos-h3DCuLXw
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-SEP-24 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------
Cisco Aironet Access Points Ethernet Wired Clients Denial of Service
Vulnerability
Priority: High
Advisory ID: cisco-sa-ap-ethport-dos-xtjTt8pY
First Published: 2020 September 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvq94716
CVE-2020-3552
CWE-476
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 Ethernet packet handling of Cisco Aironet Access
Points (APs) Software could allow an unauthenticated, adjacent attacker to
cause a denial of service (DoS) condition on an affected device.
The vulnerability is due to insufficient input validation. An attacker
could exploit this vulnerability by connecting as a wired client to the
Ethernet interface of an affected device and sending a series of specific
packets within a short time frame. A successful exploit could allow the
attacker to cause a NULL pointer access that results in a reload of the
affected device.
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-ap-ethport-dos-xtjTt8pY
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they have an
Ethernet interface used to provide network access to wired clients, such as
a Remote LAN (RLAN) port or Ethernet bridging, and that interface is
configured for 802.1q tagging:
Aironet 1540 Series APs
Aironet 1560 Series APs
Aironet 1810, 1815, 1840, and 1850 Series APs
Aironet 2800 Series APs
Aironet 3800 Series APs
For information about which Cisco 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.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Business 100 Series APs and Mesh Extenders
Business 200 Series APs
Aironet 1830 Series APs
Aironet 4800 APs
Catalyst IW 6300 APs
ESW6300 Series APs
Catalyst 9100 APs
Integrated Access Point on 1100 Integrated Services Routers
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 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
The process to upgrade the APs requires administrators to upgrade the
wireless controller that the APs are registered to.
In the following table(s), the left column lists Cisco Wireless Controller
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. To ensure a complete upgrade solution, consider
that this advisory is part of a collection that includes the following
advisory:
cisco-sa-aironet-dos-VHr2zG9y : Cisco Aironet Access Points UDP
Flooding Denial of Service Vulnerability
Cisco Access Points Managed by Cisco Wireless LAN Controller
Cisco Wireless LAN First Fixed First Fixed Release for All
Controller Software Release for This Vulnerabilities Described in This
Major Release Vulnerability Collection of Advisories
8.5 and earlier Not vulnerable. 8.5.161.0
8.6 - 8.7 Not vulnerable. 8.10.112.0
8.8 - 8.9 8.10.105.0 8.10.112.0
8.10 Not vulnerable. 8.10.112.0
Cisco Access Points Managed by Cisco Catalyst 9800 Wireless Controller
Cisco Catalyst 9800 First Fixed First Fixed Release for All
Wireless Controller Release for This Vulnerabilities Described in This
Software Major Release Vulnerability Collection of Advisories
16.12 and earlier 16.12.2s 16.12.4a
17 Not vulnerable. Not vulnerable.
Cisco Business Access Points Software
Cisco Business AP First Fixed First Fixed Release for All
Software Major Release for This Vulnerabilities Described in This
Release Vulnerability Collection of Advisories
10.0 Not vulnerable. 10.1.1.0
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 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-ap-ethport-dos-xtjTt8pY
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-SEP-24 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------
Cisco Aironet Access Points UDP Flooding Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-aironet-dos-VHr2zG9y
First Published: 2020 September 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvr85609CSCvr85614
CVE-2020-3560
CWE-400
CVSS Score:
8.6 AV:N/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 Cisco Aironet Access Points (APs) could allow an
unauthenticated, remote attacker to cause a denial of service (DoS) on an
affected device.
The vulnerability is due to improper resource management while processing
specific packets. An attacker could exploit this vulnerability by sending a
series of crafted UDP packets to a specific port on an affected device. A
successful exploit could either allow the attacker to tear down the
connection between the AP and the wireless LAN controller, resulting in the
affected device not being able to process client traffic, or cause the
vulnerable device to reload, triggering a DoS condition. After the attack,
the affected device should automatically recover its normal functions
without manual intervention.
Cisco has released software updates that address the vulnerability
described in this advisory. 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-aironet-dos-VHr2zG9y
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
Business 100 Series APs and Mesh Extenders
Business 200 Series APs
Catalyst 9100 APs
Catalyst IW 6300 APs
ESW6300 Series APs
Integrated Access Point on 1100 Integrated Services Routers
Note: For Cisco 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.
Details
o The vulnerability described in this advisory presents two different
nuances. The exploit techniques and attack vectors are almost identical,
and the fixed code addresses both of them. In this section, administrators
can find additional details about these two security issues:
CSCvr85614 can be exploited by an attacker connected over the network,
targeting any AP regardless of its deployment mode. Exploiting this
vulnerability would cause the targeted AP to lose the connection to its
controller, which could lead to client network loss or radio resets,
depending on the configuration. The AP should recover on its own when
the attack stops.
CSCvr85609 can also be exploited by an attacker connected over the
network and is also independent of the AP deployment mode. Exploiting
this vulnerability would cause the AP to unexpectedly reload. The
device should recover automatically after a few minutes without manual
intervention.
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
The process to upgrade the APs requires administrators to upgrade the
wireless controller that the APs are registered to.
In the following table(s), the left column lists Cisco Wireless Controller
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. To ensure a complete upgrade solution, consider
that this advisory is part of a collection that includes the following
advisory:
cisco-sa-ap-ethport-dos-xtjTt8pY : Cisco Aironet Access Points Ethernet
Wired Clients Denial of Service Vulnerability
Cisco Access Points Managed by Cisco Wireless LAN Controller
Cisco Wireless LAN First Fixed First Fixed Release for All
Controller Software Release for This Vulnerabilities Described in This
Major Release Vulnerability Collection of Advisories
8.5 and earlier 8.5.161.0 8.5.161.0
8.6 8.8.130.0 8.10.112.0
8.7 8.8.130.0 8.10.112.0
8.8 8.8.130.0 8.10.112.0
8.9 8.10.112.0 8.10.112.0
8.10 8.10.112.0 8.10.112.0
Cisco Access Points Managed by Cisco Catalyst 9800 Wireless Controller
Cisco Catalyst 9800 First Fixed First Fixed Release for All
Wireless Controller Release for This Vulnerabilities Described in This
Software Major Release Vulnerability Collection of Advisories
16.12 and earlier 16.12.4a 16.12.4a
17 Not vulnerable. Not vulnerable.
Cisco Business Access Points Software
Cisco Business AP First Fixed First Fixed Release for All
Software Major Release for This Vulnerabilities Described in This
Release Vulnerability Collection of Advisories
10.0 10.1.1.0 10.1.1.0
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 Dakshil Shah and Shu Xiao 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-aironet-dos-VHr2zG9y
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-SEP-24 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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