UFS Bug: FreeBSD 6.1/6.2/7.0: MOKB-08-11-2006, CVE-2006-5824, MOKB-03-11-2006, CVE-2006-5679

O. Hartmann ohartman at mail.zedat.fu-berlin.de
Sat Nov 25 04:21:02 PST 2006

Scott Long wrote:
> Kevin Oberman wrote:
>>> Date: Fri, 24 Nov 2006 15:58:39 -0700
>>> From: Scott Long <scottl at samsco.org>
>>> Sender: owner-freebsd-stable at freebsd.org
>>> David Malone wrote:
>>>>> These two bugs are shown for FreeBSD only and I guess, Solaris and
>>>>> other BSDs  still use UFS. Are they more robust against this
>>>>> exploit or type of exploit?
>>>> I don't know of a concerted effort by anyone to improve UFS in this
>>>> way. I would guess that the odd bug would have been resolved, but
>>>> no large scale work.
>>>>     David.
>>> Another thing to keep in mind is that filesystem mounting is only
>>> available to the super-user.  If a feature came along such as
>>> automatically mounting USB drives, these bugs would indeed be critical.
>>> But for now, they are not.
>> Not on the base system, but Gnome 2.16 with hald running will mount a
>> removable device automatically. The standard configuration of Gnome runs
>> hald. Allowing user mounts of removable media is even formalized by the
>> addition of /media to hier(7). I'm not sure this should simply be
>> treated as not being significant.
> Would it be possible to restrict Gnome to only auto-mounting msdos and
> cd9660 filesystems?
> Scott
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Sorry, if my question may sound heretic, but wouldn't it be more
sophisticated solving the problem instead of disabling everything what
could trigger the bug?

Look, on many desktop systems, USB backup drives become very common,
even eSATA backup solutions. I try to use those convenienc things eithe
in lab or at home on my private machine. Mounting the file system is
done via amd() and automatically as the file system gets accessed via
its link point.


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