This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Canon imageCLASS MF743Cdw printers.
Authentication is not required to exploit this vulnerability.
The specific flaw exists within the Authorization header provided to the /mls/rls-login/basic endpoint.
The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer.
An attacker can leverage this vulnerability to execute code in the context of the device.
Canon has issued an update to correct this vulnerability.
Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.