Remote code execution in multiple Zyxel storage devices



Published: 2020-02-25

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) OS Command Injection

EUVDB-ID: #VU25597

Risk: High

CVSSv3.1:

CVE-ID: CVE-2020-9054

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 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


CPE2.3 External links

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

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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