Cisco Security Advisory
Cisco Access Points VLAN Bypass from Native VLAN Vulnerability
Click Icon to Copy Verbose Score
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
-
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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY
-
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.
-
In order to exploit this vulnerability, an attacker must be able to inject traffic into the native VLAN of an AP.
-
There are no workarounds that address this vulnerability.
-
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 Controller Software Release First Fixed 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.
-
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.
-
This vulnerability was found by Javier Contreras of Cisco during internal security testing.
-
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.
-
Show LessVersion Description Section Status Date 1.1 Updated Fixed Release information for Cisco Wireless LAN Controller Software Release. Fixed Software Final 2022-OCT-04 1.0 Initial public release. - Final 2022-SEP-27
-
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.