IDC SFX2100 Satellite Receiver allows unprivileged modification of DNS configuration due to world-writable `/etc/resolv.conf`

IDC SFX2100 Satalite Recievers set the `/etc/resolv.conf` file to be world-writable by any local user, allowing DNS resolver tampering that can redirect network communications, facilitate man-in-the-middle attacks, and cause denial of service.