Zyxel NAS < 5.21 / USG < 4.35 / ATP < 4.35 / VPN < 4.35 / ZyWALL < 4.35 RCE (CVE-2020-9054)

critical Nessus Plugin ID 176894

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Synopsis

The remote security gateway is affected by a remote rode execution vulnerability.

Description

Firmware version of the Zyxel USG, ATP, ZyWALL or VPN is less than 4.35 or the version of Zyxel NAS is less than 5.21. This Zyxel device firmware is missing authentication logic which could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Zyxel USG / ATP / VPN / ZyWALL to version 4.35 or later or update Zyxel NAS to version 5.21 or later.

Plugin Details

Severity: Critical

ID: 176894

File Name: zyxel_usg_CVE-2020-9054.nasl

Version: 1.2

Type: combined

Family: Firewalls

Published: 6/7/2023

Updated: 6/8/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2020-9054

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/h:zyxel:usg_flex

Required KB Items: installed_sw/Zyxel Unified Security Gateway (USG)

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/24/2020

Vulnerability Publication Date: 2/24/2020

CISA Known Exploited Vulnerability Due Dates: 4/15/2022

Reference Information

CVE: CVE-2020-9054

Detections

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