Vulnerability identifier: #VU67708

Vulnerability risk: Medium

CVSSv3.1: 4.1 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-20728

CWE-ID: CWE-284

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
6300 Series Embedded Services Access Points
Other software / Other software solutions
Aironet 1800 Access Points
Other software / Other software solutions
Aironet 4800 Access Points
Other software / Other software solutions
Business 100 Series Access Points
Other software / Other software solutions
Business 200 Series Access Points
Other software / Other software solutions
Cisco Aironet 1540 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Aironet 1560 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Aironet 2800 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Aironet 3800 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9100
Hardware solutions / Routers & switches, VoIP, GSM, etc
Catalyst IW6300 AC Heavy Duty Access Point
Hardware solutions / Routers & switches, VoIP, GSM, etc
Integrated AP on 1100 Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9800 Wireless Controller
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Wireless LAN Controller
Hardware solutions / Firmware

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists 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. A remote non-authenticated attacker on the local network with access to the native VLAN can direct traffic directly to the client through their MAC/IP combination, and as a result bypass VLAN separation and potentially also bypass any Layer 3 protection mechanisms that are deployed.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

6300 Series Embedded Services Access Points: All versions

Cisco Aironet 1540 Series Access Points: All versions

Cisco Aironet 1560 Series Access Points: All versions

Aironet 1800 Access Points: All versions

Cisco Aironet 2800 Series Access Points: All versions

Cisco Aironet 3800 Series Access Points: All versions

Aironet 4800 Access Points: All versions

Business 100 Series Access Points: All versions

Business 200 Series Access Points: All versions

Cisco Catalyst 9100: All versions

Catalyst IW6300 AC Heavy Duty Access Point : All versions

Integrated AP on 1100 Integrated Services Routers: All versions

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz99036

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.