#VU9874 Improper access control in WD My Cloud

Vulnerability identifier: #VU9874

Vulnerability risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: N/A

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WD My Cloud
Hardware solutions / Office equipment, IP-phones, print servers

Vendor: Western Digital

Description
The vulnerability allows a remote attacker to gain access to potentially sensitive data.

The vulnerability exists due to absent validation of the access credentials before displaying the list of all application users via "/api/2.1/rest/users" API. A remote unauthenticated attacker can send a simple HTTP GET request an view the list of all device users.

Exploitation example:

GET /api/2.1/rest/users? HTTP/1.1

Mitigation
Update to version 2.30.172.

Vulnerable software versions

WD My Cloud: 2.10.302 - 2.30.165

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External links
https://support.wdc.com/download/notes/WD_My_Cloud_Firmware_Release_Notes_2.30.172.pdf?v=987
https://gulftech.org/advisories/WDMyCloud%20Multiple%20Vulnerabilities/125

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.