VLAN separation bypass in Cisco Access Points

1) Improper access control

EUVDB-ID: #VU67708

Risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-20728

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

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

Cisco Wireless LAN Controller: before 8.10MR8

Cisco Catalyst 9800 Wireless Controller: before 17.3.6

CPE2.3

• cpe:2.3:a:cisco_systems:6300_series_embedded_services_access_points:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_aironet_1540_series:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_aironet_1560_series:*:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:aironet_1800_access_points:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_aironet_2800_series_access_points:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_aironet_3800_series_access_points:*:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:aironet_4800_access_points:*:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:business_100_series_access_points:*:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:business_200_series_access_points:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_9100:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:catalyst_iw6300_ac_heavy_duty_access_point:*:*:*:*:*:catalyst_iw6300_heavy_duty_series_access_points:*:*
• cpe:2.3:h:cisco_systems:integrated_ap_on_1100_integrated_services_routers:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_wireless_lan_controller:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_9800_wireless_controller:*:*:*:*:*:*:*:*

External links

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

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.