SB2021051708 - Multiple vulnerabilities in Zyxel WiFi products

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Input validation error (CVE-ID: CVE-2020-24586)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists in the 802.11 standard due to the affected device does not clear its cache/memory to remove fragments of an incomplete MSDU/MMPDU from previous session after reconnection/reassociation. A remote attacker on the local network can perform a fragment cache attack and perform a denial of service (DoS) attack.

2) Information disclosure (CVE-ID: CVE-2020-24587)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in Windows Wireless Networking. A remote attacker on the local network can gain unauthorized access to sensitive information on the system.

3) Spoofing attack (CVE-ID: CVE-2020-24588)

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data in Windows Wireless Networking. A remote attacker on the local network can spoof page content.

Remediation

Install update from vendor's website.

References

• https://www.zyxel.com/support/Zyxel_security_advisory_for_FragAttacks_against_WiFi_products.shtml</p><p><br></p>