SB2020121920 - Remote code execution in Zyxel routers

Description

This security bulletin contains information about 1 security vulnerability.

1) Input validation error (CVE-ID: N/A)

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input when processing HTTP requests in zhttpd webserver. A remote attacker can send specially crafted HTTP request to the affected device and execute arbitrary code on the system.

Successful exploitation of the vulnerability will result in a complete compromise of the router.

Remediation

Install update from vendor's website.

References

• https://www.zyxel.com/support/Zyxel-security-advisory-for-remote-code-execution-and-denial-of-service-vulnerabilities-of-CPE.shtml