#VU67888 Authentication bypass using an alternate path or channel in BUFFALO INC. products - CVE-2022-40966

Vulnerability identifier: #VU67888

Vulnerability risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-40966

CWE-ID: CWE-288

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
WCR-300
Hardware solutions / Routers & switches, VoIP, GSM, etc
WHR-HP-G300N
Hardware solutions / Routers & switches, VoIP, GSM, etc
WHR-HP-GN
Hardware solutions / Routers & switches, VoIP, GSM, etc
WPL-05G300
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRM-D2133HP
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRM-D2133HS
Hardware solutions / Routers & switches, VoIP, GSM, etc
WTR-M2133HP
Hardware solutions / Routers & switches, VoIP, GSM, etc
WTR-M2133HS
Hardware solutions / Routers & switches, VoIP, GSM, etc
WXR-1900DHP
Hardware solutions / Routers & switches, VoIP, GSM, etc
WXR-1900DHP2
Hardware solutions / Routers & switches, VoIP, GSM, etc
WXR-1900DHP3
Hardware solutions / Routers & switches, VoIP, GSM, etc
WXR-5950AX12
Hardware solutions / Routers & switches, VoIP, GSM, etc
WXR-6000AX12B
Hardware solutions / Routers & switches, VoIP, GSM, etc
WXR-6000AX12S
Hardware solutions / Routers & switches, VoIP, GSM, etc
WZR-300HP
Hardware solutions / Routers & switches, VoIP, GSM, etc
WZR-450HP
Hardware solutions / Routers & switches, VoIP, GSM, etc
WZR-600DHP
Hardware solutions / Routers & switches, VoIP, GSM, etc
WZR-HP-AG300H
Hardware solutions / Routers & switches, VoIP, GSM, etc
WZR-HP-G302H
Hardware solutions / Routers & switches, VoIP, GSM, etc
WZR-900DHP
Hardware solutions / Routers & switches, VoIP, GSM, etc
WZR-1750DHP2
Hardware solutions / Routers & switches, VoIP, GSM, etc
WEM-1266
Hardware solutions / Routers & switches, VoIP, GSM, etc
WEM-1266WP
Hardware solutions / Routers & switches, VoIP, GSM, etc
WLAE-AG300N
Hardware solutions / Routers & switches, VoIP, GSM, etc
FS-G300N
Hardware solutions / Routers & switches, VoIP, GSM, etc
FS-HP-G300N
Hardware solutions / Routers & switches, VoIP, GSM, etc
FS-R600DHP
Hardware solutions / Routers & switches, VoIP, GSM, etc
FS-600DHP
Hardware solutions / Routers & switches, VoIP, GSM, etc
BHR-4GRV
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: BUFFALO INC.

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests. A remote attacker on the local network can bypass authentication for the target device.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

WCR-300: before 1.88

WHR-HP-G300N: before 2.01

WHR-HP-GN: before 1.88

WPL-05G300: before 1.89

WRM-D2133HP: before 2.86

WRM-D2133HS: before 2.97

WTR-M2133HP: before 2.86

WTR-M2133HS: before 2.97

WXR-1900DHP: before 2.51

WXR-1900DHP2: before 2.60

WXR-1900DHP3: before 2.64

WXR-5950AX12: before 3.41

WXR-6000AX12B: before 3.41

WXR-6000AX12S: before 3.41

WZR-300HP: before 2.01

WZR-450HP: before 2.01

WZR-600DHP: before 2.01

WZR-HP-AG300H: before 1.77

WZR-HP-G302H: before 1.89

WZR-900DHP: before 1.16

WZR-1750DHP2: before 2.32

WEM-1266: before 2.86

WEM-1266WP: before 2.86

WLAE-AG300N: before 1.87

FS-G300N: before 3.15

FS-HP-G300N: before 3.34

FS-R600DHP: before 3.41

FS-600DHP: before 3.41

BHR-4GRV: before 2.01

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External links
https://jvn.jp/en/vu/JVNVU92805279/index.html
https://www.buffalo.jp/news/detail/20221003-01.html

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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.