Unrestricted file upload in WD My Cloud - #VU9872

Vulnerability identifier: #VU9872

CSH Severity: High

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber

CVE-ID: N/A

CWE-ID: CWE-434

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: Western Digital

Affected software:
WD My Cloud

The vulnerability allows a remote attacker to compromise vulnerable device.

The vulnerability exists due to improper validation of file extension in "/usr/local/modules/web/pages/jquery/uploader/multi_uploadify.php" scrpit before uploading files via the "/mydlink/mydlink.cgi" URI. A remote unauthenticated attacker can send a specially crafted HTTP POST request to vulnerable device and upload arbitrary file on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable device.

Note: description of this vulnerability was updated according to GulfTech advisory.

Update to version 2.30.172.

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