ICS Advisories

Risk evaluation

The firmware update package (WUP) is not signed entirely. The used password offers no additional security, it is just meant to protect from unintentional modifications of the WUP file. Thus only the integrity of the signed firmware part (rauc file) is protected against intended manipulation. An attacker could manipulate the WUP file in a way that additional files with potentially malicious content are added to the WUP file. In case an authorized user that issues a firmware update could be tricked into installing this manipulated WUP file onto the device, the potentially malicious files would also be copied and installed on to the device and executed with elevated privileges.

Mitigation summary

Execute FW-Update only as user 'admin'.