Path traversal in ZyXEL Communications Corp. products - CVE-2022-2030

Vulnerability identifier: #VU65413

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2022-2030

CWE-ID: CWE-22

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

USG FLEX 200
USG FLEX 100W
USG FLEX 500
USG FLEX 700
USG20W-VPN
USG FLEX 50W
ZyWALL
USG series
VPN series
ATP series

Install updates from vendor's website.

USG FLEX 200 - update to 5.31
ZyWALL - update to 4.72 week28
USG FLEX 100W - update to 5.31
USG series - update to 4.72 week28
USG FLEX 500 - update to 5.31
VPN series - update to 5.31
ATP series - update to 5.31
USG FLEX 700 - update to 5.31
USG20W-VPN - update to 5.31
USG FLEX 50W - update to 5.31

• https://www.zyxel.com/support/Zyxel-security-advisory-authenticated-directory-traversal-vulnerabilities-of-firewalls.shtml

• Multiple vulnerabilities in Zyxel products