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GOT PATCHES? —


ZYXEL PATCHES CRITICAL VULNERABILITY THAT CAN ALLOW FIREWALL AND VPN HIJACKS


HACKERS CAN EXPLOIT AUTHENTICATION BYPASS FLAW TO GAIN ADMINISTRATIVE CONTROL.

Dan Goodin - 4/5/2022, 12:14 AM

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Hardware manufacturer Zyxel has issued patches for a highly critical security
flaw that gives malicious hackers the ability to take control of a wide range of
firewalls and VPN products the company sells to businesses.

The flaw is an authentication bypass vulnerability that stems from a lack of a
proper access-control mechanism in the CGI (common gateway interface) of
affected devices, the company said. Access control refers to a set of policies
that rely on passwords and other forms of authentication to ensure resources or
data are available only to authorized people. The vulnerability is tracked as
CVE-2022-0342.

“The flaw could allow an attacker to bypass the authentication and obtain
administrative access of the device,” Zyxel said in an advisory. The severity
rating is 9.8 out of a possible 10.

The vulnerability is present in the following devices:

Affected series Affected firmware version Patch availability USG/ZyWALL ZLD
V4.20 through ZLD V4.70 ZLD V4.71 USG FLEX ZLD V4.50 through ZLD V5.20 ZLD V5.21
Patch 1 ATP ZLD V4.32 through ZLD V5.20 ZLD V5.21 Patch 1 VPN ZLD V4.30 through
ZLD V5.20 ZLD V5.21 NSG V1.20 through V1.33 Patch 4
 * Hotfix V1.33p4_WK11* available now
 * Standard patch V1.33 Patch 5 in May 2022

The advisory comes after other hardware makers have recently reported their
products have similar vulnerabilities that are actively being exploited in the
wild. Sophos, for instance, said that an authentication bypass vulnerability
allowing remote code execution was recently fixed in the Sophos Firewall v18.5
MR3 (18.5.3) and older. CVE-2022-1040 was already being used to target
companies, primarily in Asia.

Trend Micro also warned that hackers were exploiting a vulnerability in its
Trend Micro Apex Central that made it possible to upload and execute malicious
files. The flaw is tracked as CVE-2022-26871.

Zyxel credited the discovery of CVE-2022-0342 to Alessandro Sgreccia from
Tecnical Service SrL and Roberto Garcia H and Victor Garcia R from Innotec
Security. There are no known reports of the vulnerabilities being actively
exploited.


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Dan Goodin Dan is the Security Editor at Ars Technica, which he joined in 2012
after working for The Register, the Associated Press, Bloomberg News, and other
publications.
Email dan.goodin@arstechnica.com // Twitter @dangoodin001

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