Advisory Details

June 8th, 2023

(Pwn2Own) Western Digital MyCloud PR4100 RESTSDK Server-Side Request Forgery Vulnerability

ZDI-23-850
ZDI-CAN-19767

CVE ID CVE-2022-29840
CVSS SCORE 7.3, AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AFFECTED VENDORS Western Digital
AFFECTED PRODUCTS MyCloud PR4100
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to execute arbitrary code 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 the lack of proper validation of a URI prior to accessing resources. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root.

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)
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