Zyxel Signature Update Causing Firewall Boot Loops, here is a Quick Look at what to know

Zyxel

Zyxel Signature Update Causing Firewall Boot Loops, here is a Quick Look at what to know

Zyxel recently issued a warning about a faulty security signature update. This update is causing critical errors in USG FLEX and ATP Series firewalls, including boot loops. The company identified the issue and shared steps to resolve it.

1489338066_cia-wikileaks-hacker-2-1024x575 Zyxel Signature Update Causing Firewall Boot Loops, here is a Quick Look at what to know

Identifying the Problem

The issue stems from a failure in an Application Signature Update for cybersecurity features. Zyxel pushed out this update between January 24 and 25, which led to several problems. Devices affected by the faulty update are experiencing reboot loops, ZySH daemon failures, and login access problems. Additionally, the system LED may flash, and CPU usage is high.

The Impact of the Update

Only USG FLEX or ATP Series firewalls with active security licenses are impacted. Devices on the Nebula platform or USG FLEX H (uOS) series are not affected. The faulty update has caused a range of issues, including device errors, high CPU usage, and coredump messages on the console.

Steps for a Solution

Zyxel advises that the only way to fix the issue is to have physical access to the firewall. Administrators need to connect to the console via an RS232 serial cable. They must then follow a series of steps to restore the firewall, including backing up the configuration, downloading and applying a special firmware, and restoring the backed-up configuration file via the web GUI.

Support for Administrators

Zyxel will host a Microsoft Teams Open Question Session on January 25th to assist customers with the recovery process. This session will provide an opportunity for administrators to ask questions and receive guidance on resolving the issue.

Importance of Managing Updates

Zyxel’s warning highlights the importance of carefully managing security updates. Administrators should review the detailed steps provided by Zyxel before attempting to recover their devices. By following these steps, they can restore their firewalls and prevent further issues.


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