Advisory Details

February 9th, 2023

(Pwn2Own) Western Digital MyCloud PR4100 DDNS Response Processing Command Injection Remote Code Execution Vulnerability

CVE ID	CVE-2022-29843
CVSS SCORE	7.5, AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of DDNS responses. 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 vulnerability to execute 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	2023-01-21 - Vulnerability reported to vendor 2023-02-09 - Coordinated public release of advisory
CREDIT	rskvp93 and biennd4 (from VcsLab of Viettel Cyber Security)

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