OS Command Injection in multiple Zyxel devices

1) OS Command Injection

EUVDB-ID: #VU63145

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-2022-30525

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 in the CGI program. A remote unauthenticated attacker 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

USG FLEX 100W: 5.00 - 5.21 Patch 1

USG FLEX 200: 5.00 - 5.21 Patch 1

USG FLEX 500: 5.00 - 5.21 Patch 1

USG FLEX 700: 5.00 - 5.21 Patch 1

USG FLEX 50W: 5.10 - 5.21 Patch 1

USG20W-VPN: 5.10 - 5.21 Patch 1

ATP series: 5.10 - 5.21 Patch 1

VPN series: 4.60 - 5.21 Patch 1

External links

http://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.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.