linux-kernel - Re: staging: possible buffer overflow in rtw_wx_set_scan function in driver/staging/rtl8723bs

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Date:   Tue, 24 Aug 2021 10:07:18 +0800
From:   iLifetruth <yixiaonn@...il.com>
To:     Fabio Aiuto <fabioaiuto83@...il.com>
Cc:     gregkh@...uxfoundation.org, ross.schm.dev@...il.com,
        marcocesati@...il.com, insafonov@...il.com,
        linux-staging@...r.kernel.org, linux-kernel@...r.kernel.org,
        Qiang Liu <cyruscyliu@...il.com>, yajin@...kernel.org
Subject: Re: staging: possible buffer overflow in rtw_wx_set_scan function in driver/staging/rtl8723bs

I haven't committed the patch yet since the Linux staging tree may
seem special. It's not clear to me where to submit the patch. So could
you please fix it?

Regards and thanks for your confirmation,
- iLifetruth


On Tue, Aug 24, 2021 at 1:08 AM Fabio Aiuto <fabioaiuto83@...il.com> wrote:
>
> Hello,
>
> On Mon, Aug 23, 2021 at 11:19:09PM +0800, iLifetruth wrote:
> > Hi, in the latest version of Linux staging tree, we may have found an
> > unfixed security bug in the staging/driver/rtl8723bs related to the
> > CVE-2021-28660. Now, we would like to contact you to confirm this
> > problem.
> >
> > ===========
> > Here is the description of CVE-2021-28660:
> >
> > "It was discovered that the rtl8188eu WiFi driver did not correctly
> > limit the length of SSIDs copied into scan results. An attacker within
> > WiFi range could use this to cause a denial of service (crash or
> > memory corruption) or possibly to execute code on a vulnerable
> > system."
> >
> > ===========
> > The staging driver "rtl8188eu" was fixed by commit
> > 74b6b20df8cfe90ada777d621b54c32e69e27cd7 on 2021-03-10.
> >
> > However, in another similar staging driver numbered "rtl8723bs", a
> > function named “rtw_wx_set_scan” remains the same problem unfixed. And
> > it is detected in the
> > “drivers/staging/rtl8723bs/os_dep/ioctl_linux.c#Line1354" without
> > checking to prevent writing beyond the end of the ->ssid[] array.
> >
> > Therefore, shall we port the same fix from RTL8188EU to RTL8723BS?
>
> I think it's a good idea, moreover I've just sent a patch series
> aimed at removing that piece of code for it belongs to very
> old wext implementation.
>
> But until it's not accepted by the maintainer that security bug
> is present and harmful. If you fix it thank you, if you don't
> thank you for reporting this, I will fix as soon as possible.
>
> >
> > Thank you!
>
> thank you,
>
> fabio