(Pwn2Own) Western Digital MyCloud PR4100 RESTSDK Uncontrolled Resource Consumption Denial-of-Service Vulnerability

June 8th, 2023
ZDI-23-851 ZDI-CAN-19856

CVE ID

CVE-2022-36326

CVSS Score

6.5 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors

Western Digital

Affected Products

MyCloud PR4100

Vulnerability Details

This vulnerability allows network-adjacent attackers to create a denial-of-service condition on affected installations of Western Digital MyCloud PR4100 NAS devices. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the RESTSDK server. The issue results from uncontrolled resource consumption. An attacker can leverage this vulnerability to create a denial-of-service condition on the device.

Additional Details

Western Digital has issued an update to correct this vulnerability. More details can be found at:
https://www.westerndigital.com/support/product-security/wdc-23006-my-cloud-firmware-version-5-26-202

Disclosure Timeline

  • 2022-12-29 - Vulnerability reported to vendor
  • 2023-06-08 - Coordinated public release of advisory

Credit

Sam Thomas (@_s_n_t) of Pentest Ltd (@pentestltd)

Back to Advisories