Authentication bypass in several Zyxel firewalls



Published: 2022-03-30
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-0342
CWE-ID CWE-287
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		USG series
Client/Desktop applications / Antivirus software/Personal firewalls

USG FLEX series
Client/Desktop applications / Antivirus software/Personal firewalls

VPN series
Client/Desktop applications / Antivirus software/Personal firewalls

ZyWALL
Other software / Other software solutions

NSG series
Hardware solutions / Routers for home users

ATP series
Hardware solutions / Routers for home users

Vendor

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Improper Authentication

EUVDB-ID: #VU61723

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-0342

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to missing authentication checks in the web interface. A remote attacker can bypass authentication process and obtain administrative access to the device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

USG series: before 4.71

ZyWALL: before 4.71

USG FLEX series: before 5.21 Patch 1

VPN series: before 5.21

NSG series: before 1.33p4_WK11

ATP series: before 5.21 Patch 1

External links

http://www.zyxel.com/support/Zyxel-security-advisory-for-authentication-bypass-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?

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



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