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AUSCERT External Security Bulletin Redistribution
ESB-2022.4806.2
Cisco Access Points VLAN Bypass from Native VLAN Vulnerability
6 October 2022
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: 6300 Series Embedded Services Access Points (ESW6300)
Aironet Access Points
Business Series Access Points
Catalyst Access Points
Integrated AP on 1100 Integrated Services Routers
Publisher: Cisco Systems
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20728
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY
Comment: CVSS (Max): 4.7 CVE-2022-20728 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Revision History: October 6 2022: Vendor updated Fixed Release information
September 28 2022: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Access Points VLAN Bypass from Native VLAN Vulnerability
Priority: Medium
Advisory ID: cisco-sa-apvlan-TDTtb4FY
First Published: 2022 September 27 16:00 GMT
Last Updated: 2022 October 4 13:22 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvz99036
CVE Names: CVE-2022-20728
CWEs: CWE-284
Summary
o A vulnerability in the client forwarding code of multiple Cisco Access
Points (APs) could allow an unauthenticated, adjacent attacker to inject
packets from the native VLAN to clients within nonnative VLANs on an
affected device.
This vulnerability is due to a logic error on the AP that forwards packets
that are destined to a wireless client if they are received on the native
VLAN. An attacker could exploit this vulnerability by obtaining access to
the native VLAN and directing traffic directly to the client through their
MAC/IP combination. A successful exploit could allow the attacker to bypass
VLAN separation and potentially also bypass any Layer 3 protection
mechanisms that are deployed.
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-apvlan-TDTtb4FY
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running a vulnerable release of Cisco Aironet Series
Access Points Software in either local or flex local switching modes:
6300 Series Embedded Services Access Points (ESW6300)
Aironet 1540 Series Access Points
Aironet 1560 Series Access Points
Aironet 1800 Series Access Points
Aironet 2800 Series Access Points
Aironet 3800 Series Access Points
Aironet 4800 Access Points
Business 100 Series Access Points
Business 200 Series Access Points
Catalyst 9100 Access Points
Catalyst IW 6300 Heavy Duty Series Access Points
Integrated AP 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.
Cisco has confirmed that this vulnerability does not affect any Cisco
Access Point series that is not listed in the Vulnerable Products section
of this advisory.
Details
o In order to exploit this vulnerability, an attacker must be able to inject
traffic into the native VLAN of an AP.
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
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 that is
described in this advisory and which release included the fix for this
vulnerability.
Access Points Managed by Wireless LAN Controller
Cisco Wireless LAN Controller Software Release First Fixed Release
8.5 and earlier Migrate to a fixed release.
8.10 8.10.181.0
Access Points Managed by Catalyst 9800 Wireless Controller
Cisco Catalyst 9800 Wireless First Fixed Release
Controller Software Release
17.2 and earlier Migrate to a fixed release.
17.3 Migrate to 17.3.6 and apply APSP patch
(APSP patch no. TBD)
17.4 Migrate to a fixed release.
17.5 Migrate to a fixed release.
17.6 17.6.2
17.7 and later Not affected.
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
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 Javier Contreras 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.
Related to This Advisory
o
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY
Revision History
o +---------+-----------------------------+----------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+-----------------------------+----------+--------+-------------+
| | Updated Fixed Release | | | |
| 1.1 | information for Cisco | Fixed | Final | 2022-OCT-04 |
| | Wireless LAN Controller | Software | | |
| | Software Release. | | | |
+---------+-----------------------------+----------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2022-SEP-27 |
+---------+-----------------------------+----------+--------+-------------+
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