What is the severity of ZDI-20-1445?

The severity of ZDI-20-1445 is classified as critical due to the potential for authentication bypass.

How do I fix ZDI-20-1445?

To fix ZDI-20-1445, update the firmware of the Western Digital MyCloud PR4100 to the latest version.

Who is affected by ZDI-20-1445?

ZDI-20-1445 affects installations of Western Digital MyCloud PR4100 that have not been updated.

What type of vulnerability is identified by ZDI-20-1445?

ZDI-20-1445 is an authentication bypass vulnerability that allows attackers to gain unauthorized access.

Can ZDI-20-1445 be exploited remotely?

No, ZDI-20-1445 requires network-adjacent access to exploit the vulnerability.

Vulnerability/
ZDI-20-1445

medium

5.4

30/1/2025

ZDI-20-1445: (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-20-1445?
The severity of ZDI-20-1445 is classified as critical due to the potential for authentication bypass.
How do I fix ZDI-20-1445?
To fix ZDI-20-1445, update the firmware of the Western Digital MyCloud PR4100 to the latest version.
Who is affected by ZDI-20-1445?
ZDI-20-1445 affects installations of Western Digital MyCloud PR4100 that have not been updated.
What type of vulnerability is identified by ZDI-20-1445?
ZDI-20-1445 is an authentication bypass vulnerability that allows attackers to gain unauthorized access.
Can ZDI-20-1445 be exploited remotely?
No, ZDI-20-1445 requires network-adjacent access to exploit the vulnerability.

agent/references
agent/type
agent/severity
agent/title
agent/description
agent/softwarecombine
agent/event
agent/source
agent/tags
collector/zdi-advisory
source/ZDI
alias/ZDI-20-1445
alias/ZDI-CAN-12214
alias/CVE-2020-28940
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-20-1445?
The severity of ZDI-20-1445 is classified as critical due to the potential for authentication bypass.
How do I fix ZDI-20-1445?
To fix ZDI-20-1445, update the firmware of the Western Digital MyCloud PR4100 to the latest version.
Who is affected by ZDI-20-1445?
ZDI-20-1445 affects installations of Western Digital MyCloud PR4100 that have not been updated.
What type of vulnerability is identified by ZDI-20-1445?
ZDI-20-1445 is an authentication bypass vulnerability that allows attackers to gain unauthorized access.
Can ZDI-20-1445 be exploited remotely?
No, ZDI-20-1445 requires network-adjacent access to exploit the vulnerability.