What is the severity of ZDI-CAN-12327?

The severity of ZDI-CAN-12327 is critical due to the ability for network-adjacent attackers to bypass authentication.

How do I fix ZDI-CAN-12327?

To fix ZDI-CAN-12327, users should update their Western Digital My Cloud PR4100 to the latest firmware version that addresses this vulnerability.

Who is affected by ZDI-CAN-12327?

ZDI-CAN-12327 affects installations of Western Digital My Cloud PR4100 that have not been updated to a patched firmware.

What type of vulnerability is ZDI-CAN-12327?

ZDI-CAN-12327 is an authentication bypass vulnerability that allows attackers to gain unauthorized access.

What can an attacker do if they exploit ZDI-CAN-12327?

If exploited, an attacker can bypass authentication mechanisms and potentially gain access to sensitive data on the affected device.

Vulnerability/
ZDI-CAN-12327

medium

5.4

30/1/2025

ZDI-CAN-12327: (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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Frequently Asked Questions

What is the severity of ZDI-CAN-12327?
The severity of ZDI-CAN-12327 is critical due to the ability for network-adjacent attackers to bypass authentication.
How do I fix ZDI-CAN-12327?
To fix ZDI-CAN-12327, users should update their Western Digital My Cloud PR4100 to the latest firmware version that addresses this vulnerability.
Who is affected by ZDI-CAN-12327?
ZDI-CAN-12327 affects installations of Western Digital My Cloud PR4100 that have not been updated to a patched firmware.
What type of vulnerability is ZDI-CAN-12327?
ZDI-CAN-12327 is an authentication bypass vulnerability that allows attackers to gain unauthorized access.
What can an attacker do if they exploit ZDI-CAN-12327?
If exploited, an attacker can bypass authentication mechanisms and potentially gain access to sensitive data on the affected device.

agent/references
agent/softwarecombine
agent/severity
agent/title
agent/type
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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