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.
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