#VU58442 OS Command Injection in ELECOM CO. ,LTD. products - CVE-2021-20859

Vulnerability identifier: #VU58442

Vulnerability risk: Medium

CVSSv4.0: 6.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-20859

CWE-ID: CWE-78

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 execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation. A remote authenticated attacker on the local network can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

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 authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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