Remote Code Execution on Western Digital PR4100 NAS (CVE-2022-23121)

This blog post describes an unchecked return value vulnerability found and exploited in September 2021 by Alex Plaskett, Cedric Halbronn and Aaron Adams working at the Exploit Development Group (EDG) of NCC Group. We successfully exploited it at Pwn2Own 2021 competition in November 2021 when targeting the Western Digital PR4100.