#VU58444 Improper access control in ELECOM CO. ,LTD. products - CVE-2021-20861

Vulnerability identifier: #VU58444

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-2021-20861

CWE-ID: CWE-284

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
WRC-1167GST2
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-1167GST2A
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-1167GST2H
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-2533GS2-B
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-2533GS2-W
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-1750GS
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-1750GSV
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-1900GST
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-2533GST
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-2533GSTA
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-2533GST2
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-2533GST2SP
Hardware solutions / Routers & switches, VoIP, GSM, etc
WRC-2533GST2-G
Hardware solutions / Routers & switches, VoIP, GSM, etc
EDWRC-2533GST2
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: ELECOM CO. ,LTD.

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the management screen. A remote attacker on the local network can bypass implemented security restrictions and gain unauthorized access to the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

WRC-1167GST2: 1.25

WRC-1167GST2A: 1.25

WRC-1167GST2H: 1.25

WRC-2533GS2-B: 1.52

WRC-2533GS2-W: 1.52

WRC-1750GS: 1.03

WRC-1750GSV: 2.11

WRC-1900GST: 1.03

WRC-2533GST: 1.03

WRC-2533GSTA: 1.03

WRC-2533GST2: 1.25

WRC-2533GST2SP: 1.25

WRC-2533GST2-G: 1.25

EDWRC-2533GST2: 1.25

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External links
https://jvn.jp/en/jp/JVN88993473/index.html
https://www.elecom.co.jp/news/security/20211130-01/

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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.