Advisory Details

June 8th, 2023

(Pwn2Own) Western Digital MyCloud PR4100 do_reboot Command Injection Remote Code Execution Vulnerability

ZDI-23-849
ZDI-CAN-19607

CVE ID CVE-2022-29841
CVSS SCORE 8.8, (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Western Digital
AFFECTED PRODUCTS MyCloud PR4100
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Western Digital MyCloud PR4100 NAS devices. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.

The specific flaw exists within the do_reboot binary. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. 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-23002-my-cloud-firmware-version-5-26-119
DISCLOSURE TIMELINE
  • 2023-01-24 - Vulnerability reported to vendor
  • 2023-06-08 - Coordinated public release of advisory
CREDIT Claroty Research - Vera Mens, Noam Moshe, Uri Katz, Sharon Brizinov
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