If the permissions allow it, files are moved (instead of copied) to the destination.
It writes data to files, it may be used to do privileged writes or write files outside a restricted file system.
LFILE=file_to_write INPUT=input_file exiftool -filename=$LFILE $INPUT
It reads data from files, it may be used to do privileged reads or disclose files outside a restricted file system.
LFILE=file_to_read OUTPUT=output_file exiftool -filename=$OUTPUT $LFILE cat $OUTPUT
If the binary is allowed to run as superuser by
sudo, it does not drop the elevated privileges and may be used to access the file system, escalate or maintain privileged access.
LFILE=file_to_write INPUT=input_file sudo exiftool -filename=$LFILE $INPUT