Hidden functionality in multiple ELECOM LAN routers

1) Hidden functionality

EUVDB-ID: #VU60361

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-21173

CWE-ID: CWE-912 - Hidden Functionality (Backdoor)

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system

The vulnerability exists due to hidden functionality (backdoor) is present in software. A remote attacker on the local network can use this functionality to execute arbitrary OS command on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WRH-300BK3: 1.05

WRH-300WH3: 1.05

WRH-300BK3-S: 1.05

WRH-300DR3-S: 1.05

WRH-300LB3-S: 1.05

WRH-300PN3-S: 1.05

WRH-300WH3-S: 1.05

WRH-300YG3-S: 1.05

External links

http://jvn.jp/en/jp/JVN17482543/index.html
http://www.elecom.co.jp/news/security/20220208-02/

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).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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