Remote code execution in multiple Zyxel storage devices

Published: 2020-02-25 | Updated: 2023-10-09

Risk	High
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2020-9054
CWE-ID	CWE-78
Exploitation vector	Network
Public exploit	Vulnerability #1 is being exploited in the wild.
Vulnerable software Subscribe	Zyxel NAS 326 Hardware solutions / Firmware NAS520 Hardware solutions / Routers for home users NAS540 Hardware solutions / Routers for home users NAS542 Hardware solutions / Routers for home users NSA210 Hardware solutions / Routers for home users NSA220 Hardware solutions / Routers for home users NSA220+ Hardware solutions / Routers for home users NSA221 Hardware solutions / Routers for home users NSA310 Hardware solutions / Routers for home users NSA310S Hardware solutions / Routers for home users NSA320 Hardware solutions / Routers for home users NSA320S Hardware solutions / Routers for home users NSA325 Hardware solutions / Routers for home users NSA325v2 Hardware solutions / Routers for home users
Vendor	ZyXEL Communications Corp.

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) OS Command Injection

EUVDB-ID: #VU25597

Risk: High

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2020-9054

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

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation when processing username in the login form. A remote unauthenticated attacker can send a specially crafted HTTP request and execute arbitrary OS commands on the target system.

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

Mitigation

The vendor has released a hotfix for the following models:

NAS326
NAS520
NAS540
NAS542

Vulnerable software versions

Zyxel NAS 326: 5.21

NAS520: 5.21

NAS540: 5.21

NAS542: 5.21

NSA210: All versions

NSA220: All versions

NSA220+: All versions

NSA221: All versions

NSA310: All versions

NSA310S: All versions

NSA320: All versions

NSA320S: All versions

NSA325: All versions

NSA325v2: All versions

External links

http://www.zyxel.com/support/remote-code-execution-vulnerability-of-NAS-products.shtml

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.