Cisco Security Advisory - Cisco Access Points VLAN Bypass from Native VLAN Vulnerability

[Netwörkheäd]

Cisco Access Points VLAN Bypass from Native VLAN Vulnerability

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

     
         
Security Impact Rating:  Medium
   
   
       
CVE: CVE-2022-20728
Source: Cisco Access Points VLAN Bypass from Native VLAN Vulnerability

[Otanx]

Hey! A new vlan hoping attack. The 90s just sent a fax. They want their vulnerability back.

-Otanx

[deanwebb]

Oh noes! Not VLAN hopping again!

Remember, kids! Don't use the native VLAN!