Vulnerability identifier: #VU65413

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-2030

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
USG FLEX 200
Hardware solutions / Firmware
USG FLEX 100W
Hardware solutions / Firmware
USG FLEX 500
Hardware solutions / Firmware
USG FLEX 700
Hardware solutions / Firmware
USG FLEX 50W
Hardware solutions / Firmware
USG20W-VPN
Hardware solutions / Firmware
ATP series
Hardware solutions / Routers for home users
VPN series
Client/Desktop applications / Antivirus software/Personal firewalls
USG series
Client/Desktop applications / Antivirus software/Personal firewalls
ZyWALL
Other software / Other software solutions

Vendor: ZyXEL Communications Corp.

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in some CGI programs. A remote user can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

USG FLEX 200: 4.50 - 5.30

USG FLEX 100W: 4.50 - 5.30

USG FLEX 500: 4.50 - 5.30

USG FLEX 700: 4.50 - 5.30

USG FLEX 50W: 4.16 - 5.30

USG20W-VPN: 4.16 - 5.30

ATP series: 4.32 - 5.30

VPN series: 4.30 - 5.30

USG series: 4.11 - 4.72

ZyWALL: 4.11 - 4.72

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External links
http://www.zyxel.com/support/Zyxel-security-advisory-authenticated-directory-traversal-vulnerabilities-of-firewalls.shtml

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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