ASUS WebStorage abused to spy on users at the router level. Vulnerable software is potentially facilitating surveillance and data theft. The ASUS WebStorage system is being actively abused to perform Man-in-The-Middle (MiTM) attacks, researchers say. ESET researcher Anton Cherepanov published a report detailing attack vectors related to WebStorage, ASUS’s cloud storage service, on Tuesday. Third-party company: ASUS Webstorage.