Multiple vulnerabilities in multiple ELECOM LAN routers

Published: 2021-11-30

Risk	Medium
Patch available	YES
Number of vulnerabilities	3
CVE-ID	CVE-2021-20859 CVE-2021-20860 CVE-2021-20861
CWE-ID	CWE-78 CWE-352 CWE-284
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	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.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) OS Command Injection

EUVDB-ID: #VU58442

Risk: Medium

CVSSv3.1: 7 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20859

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

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

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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.

2) Cross-site request forgery

EUVDB-ID: #VU58443

Risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20860

CWE-ID: CWE-352 - Cross-Site Request Forgery (CSRF)

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.

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

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

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.

3) Improper access control

EUVDB-ID: #VU58444

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-2021-20861

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

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

External links

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

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.