What is the severity of ZDI-22-347?

ZDI-22-347 is considered a high severity vulnerability due to its potential for unauthorized access.

How do I fix ZDI-22-347?

To mitigate ZDI-22-347, update the firmware of the Western Digital MyCloud PR4100 to the latest version provided by the manufacturer.

Who is affected by ZDI-22-347?

ZDI-22-347 affects installations of the Western Digital MyCloud PR4100 that are running vulnerable firmware.

What does ZDI-22-347 allow an attacker to do?

ZDI-22-347 allows network-adjacent attackers to bypass authentication without requiring user credentials.

Is authentication required to exploit ZDI-22-347?

No, authentication is not required to exploit the vulnerability described in ZDI-22-347.

Vulnerability/
ZDI-22-347

medium

6.3

30/1/2025

ZDI-22-347: (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. Authentication is not required to exploit this vulnerability. The specific flaw exists within the nasAdmin service, which listens on TCP ports 80 and 443 by default. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this vulnerability to bypass authentication on the system.

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-22-347?
ZDI-22-347 is considered a high severity vulnerability due to its potential for unauthorized access.
How do I fix ZDI-22-347?
To mitigate ZDI-22-347, update the firmware of the Western Digital MyCloud PR4100 to the latest version provided by the manufacturer.
Who is affected by ZDI-22-347?
ZDI-22-347 affects installations of the Western Digital MyCloud PR4100 that are running vulnerable firmware.
What does ZDI-22-347 allow an attacker to do?
ZDI-22-347 allows network-adjacent attackers to bypass authentication without requiring user credentials.
Is authentication required to exploit ZDI-22-347?
No, authentication is not required to exploit the vulnerability described in ZDI-22-347.

agent/references
agent/type
agent/softwarecombine
agent/severity
agent/title
agent/description
agent/event
agent/source
agent/tags
collector/zdi-advisory
source/ZDI
alias/ZDI-22-347
alias/ZDI-CAN-15888
alias/CVE-2022-22990
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-22-347?
ZDI-22-347 is considered a high severity vulnerability due to its potential for unauthorized access.
How do I fix ZDI-22-347?
To mitigate ZDI-22-347, update the firmware of the Western Digital MyCloud PR4100 to the latest version provided by the manufacturer.
Who is affected by ZDI-22-347?
ZDI-22-347 affects installations of the Western Digital MyCloud PR4100 that are running vulnerable firmware.
What does ZDI-22-347 allow an attacker to do?
ZDI-22-347 allows network-adjacent attackers to bypass authentication without requiring user credentials.
Is authentication required to exploit ZDI-22-347?
No, authentication is not required to exploit the vulnerability described in ZDI-22-347.