linux-kernel - Re: old buffer overflow in moxa driver

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Date:	Tue, 1 May 2007 03:01:29 +0300
From:	Ismail Dönmez <ismail@...dus.org.tr>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	dann frazier <dannf@...com>, linux-kernel@...r.kernel.org,
	Jiri Slaby <jirislaby@...il.com>, support@...a.com.tw,
	dilinger@...ian.org
Subject: Re: old buffer overflow in moxa driver

On Tuesday 01 May 2007 02:04:55 Alan Cox wrote:
> >   I noticed that the moxa input checking security bug described by
> > CVE-2005-0504 appears to remain unfixed upstream.
> >
> > The issue is described here:
> >   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0504
> >
> > Debian has been shipping the following patch from Andres Salomon. I
> > tried contacting the listed maintainer a few months ago but received
> > no response.
>
>        case MOXA_LOAD_BIOS:
>         case MOXA_FIND_BOARD:
>         case MOXA_LOAD_C320B:
>         case MOXA_LOAD_CODE:
>                 if (!capable(CAP_SYS_RAWIO))
>                         return -EPERM;
>                 break;
>
> At the point you abuse these calls you can already just load arbitary
> data from userspace anyway.

So the possible exploit will only work when run by root, is that what you 
mean? If so isn't that still a security problem?

Sorry if I misunderstood what you said.

Regards,
ismail


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