netdev - Re: [PATCH] USB: disable all RNDIS protocol drivers

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Date:   Wed, 11 Jan 2023 15:56:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jan Engelhardt <jengelh@...i.de>
Cc:     linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Kalle Valo <kvalo@...nel.org>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Maciej Żenczykowski <maze@...gle.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Andrzej Pietrasiewicz <andrzejtp2010@...il.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Łukasz Stelmach <l.stelmach@...sung.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org,
        Ilja Van Sprundel <ivansprundel@...ctive.com>,
        Joseph Tartaro <joseph.tartaro@...ctive.com>
Subject: Re: [PATCH] USB: disable all RNDIS protocol drivers

On Wed, Jan 11, 2023 at 02:38:04PM +0100, Jan Engelhardt wrote:
> 
> On Wednesday 2022-11-23 13:46, Greg Kroah-Hartman wrote:
> >
> >The Microsoft RNDIS protocol is, as designed, insecure and vulnerable on
> >any system that uses it with untrusted hosts or devices.  Because the
> >protocol is impossible to make secure, just disable all rndis drivers to
> >prevent anyone from using them again.
> >
> >Windows only needed this for XP and newer systems, Windows systems older
> >than that can use the normal USB class protocols instead, which do not
> >have these problems.
> 
> 
> In other news, someone just proposed adding "RNDIS" things to UEFI, so 
> now the security problem is added right back into machines but at 
> another layer?!
> 
> https://edk2.groups.io/g/devel/topic/patch_1_3/95531719

I guess systems that use this will always have to trust that the device
plugged into them is "trusted".  Seems like an easy way to get access to
a "locked down" system if you ever need it :)

{sigh}

greg k-h