What is the severity of ZDI-20-1447?

The severity of ZDI-20-1447 is classified as critical due to the potential for authentication bypass.

How do I fix ZDI-20-1447?

To fix ZDI-20-1447, update the Western Digital MyCloud PR4100 to the latest firmware version provided by the vendor.

Who is affected by ZDI-20-1447?

ZDI-20-1447 affects installations of Western Digital MyCloud PR4100 that have not applied the necessary security updates.

What types of attacks can occur due to ZDI-20-1447?

ZDI-20-1447 allows network-adjacent attackers to access the system by bypassing the authentication mechanism.

Is user interaction required to exploit ZDI-20-1447?

Yes, while authentication is required, the existing mechanism can be bypassed without further user interaction.

Vulnerability/
ZDI-20-1447

medium

5.4

30/1/2025

ZDI-20-1447: (Pwn2Own) Western Digital MyCloud PR4100 nasAdmin Authentication Bypass Vulnerability

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of Western Digital MyCloud PR4100. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the nasAdmin service, which listens on TCP port 80 and 443 by default. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this vulnerability to execute arbitrary code in the context of root.

Affected Software	Affected Version	How to fix
Western Digital My Cloud PR4100

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Reference Links

Frequently Asked Questions

What is the severity of ZDI-20-1447?
The severity of ZDI-20-1447 is classified as critical due to the potential for authentication bypass.
How do I fix ZDI-20-1447?
To fix ZDI-20-1447, update the Western Digital MyCloud PR4100 to the latest firmware version provided by the vendor.
Who is affected by ZDI-20-1447?
ZDI-20-1447 affects installations of Western Digital MyCloud PR4100 that have not applied the necessary security updates.
What types of attacks can occur due to ZDI-20-1447?
ZDI-20-1447 allows network-adjacent attackers to access the system by bypassing the authentication mechanism.
Is user interaction required to exploit ZDI-20-1447?
Yes, while authentication is required, the existing mechanism can be bypassed without further user interaction.

agent/type
agent/references
agent/softwarecombine
agent/severity
agent/title
agent/description
agent/event
agent/source
agent/tags
collector/zdi-advisory
source/ZDI
alias/ZDI-20-1447
alias/ZDI-CAN-12327
alias/CVE-2020-28971
agent/software-canonical-lookup
agent/software-canonical-lookup-request
vendor/western digital
canonical/western digital my cloud pr4100

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Frequently Asked Questions

What is the severity of ZDI-20-1447?
The severity of ZDI-20-1447 is classified as critical due to the potential for authentication bypass.
How do I fix ZDI-20-1447?
To fix ZDI-20-1447, update the Western Digital MyCloud PR4100 to the latest firmware version provided by the vendor.
Who is affected by ZDI-20-1447?
ZDI-20-1447 affects installations of Western Digital MyCloud PR4100 that have not applied the necessary security updates.
What types of attacks can occur due to ZDI-20-1447?
ZDI-20-1447 allows network-adjacent attackers to access the system by bypassing the authentication mechanism.
Is user interaction required to exploit ZDI-20-1447?
Yes, while authentication is required, the existing mechanism can be bypassed without further user interaction.