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Date:   Wed, 11 Jan 2023 15:56:52 +0100
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Jan Engelhardt <jengelh@inai.de>
Cc:     linux-kernel@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, Kalle Valo <kvalo@kernel.org>,
        Oleksij Rempel <linux@rempel-privat.de>,
        Maciej =?utf-8?Q?=C5=BBenczykowski?= <maze@google.com>,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>,
        Jacopo Mondi <jacopo@jmondi.org>,
        =?utf-8?Q?=C5=81ukasz?= Stelmach <l.stelmach@samsung.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        linux-usb@vger.kernel.org, netdev@vger.kernel.org,
        linux-wireless@vger.kernel.org,
        Ilja Van Sprundel <ivansprundel@ioactive.com>,
        Joseph Tartaro <joseph.tartaro@ioactive.com>
Subject: Re: [PATCH] USB: disable all RNDIS protocol drivers
Message-ID: <Y77ONKx60xWUxvcN@kroah.com>
References: <20221123124620.1387499-1-gregkh@linuxfoundation.org>
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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