Zyxel addresses four flaws affecting APs, AP controllers, and firewalls

Zyxel addressed multiple vulnerabilities impacting many of its products, including APs, AP controllers, and firewalls.

Zyxel has released security updates to address multiple vulnerabilities affecting multiple products, including firewall, AP, and AP controller products.

Below is the list of the four vulnerabilities, the most severe one is a command injection flaw in some CLI commands tracked as CVE-2022-26532 (CVSS v3.1 7.8):

CVE-2022-0734: A cross-site scripting vulnerability was identified in the CGI program of some firewall versions that could allow an attacker to obtain some information stored in the user’s browser, such as cookies or session tokens, via a malicious script.
CVE-2022-26531: Multiple improper input validation flaws were identified in some CLI commands of some firewall, AP controller, and AP versions that could allow a local authenticated attacker to cause a buffer overflow or a system crash via a crafted payload.
CVE-2022-26532: A command injection vulnerability in the “packet-trace” CLI command of some firewall, AP controller, and AP versions could allow a local authenticated attacker to execute arbitrary OS commands by including crafted arguments to the command.
CVE-2022-0910: An authentication bypass vulnerability caused by the lack of a proper access control mechanism has been found in the CGI program of some firewall versions. The flaw could allow an attacker to downgrade from two-factor authentication to one-factor authentication via an IPsec VPN client.

According to the advisory published by the vendor, the issues affect USG/ZyWALL, USG FLEX, ATP, VPN, NSG firewalls, NXC2500 and NXC5500 AP controllers, and NAP, NWA, WAC, and WAX Access Point families.

The vendor has already released security patched to address the flaws for most of the affected models.

The hotfix for NXC2500 AP controllers affected by CVE-2022-26531 and CVE-2022-26532 must be requested from a local service representative.

Experts urge admins to upgrade their installs to avoid cyber attacks exploiting the above flaws.

This advice is especially important for US companies as we head into a holiday weekend when it is common for threat actors to conduct attacks.

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Pierluigi Paganini

(SecurityAffairs – hacking, Zyxel)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.