[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Mon, 11 Jul 2016 13:32:18 +0200
From: Cedric Buissart <cbuissar@...hat.com>
To: Hanno Böck <hanno@...eck.de>
Cc: oss-security@...ts.openwall.com
Subject: Re: CVE-2016-5011: util-linux: Extended partition loop
in MBR partition table leads to DoS
On Mon, Jul 11, 2016 at 12:51 PM, Hanno Böck <hanno@...eck.de> wrote:
> On Mon, 11 Jul 2016 12:11:43 +0200
> Cedric Buissart <cbuissar@...hat.com> wrote:
>
> > CVE-2016-5011: util-linux: Extended partition loop in MBR partition
> > table leads to DoS
>
> Have you discovered this bug or do you know how it was discovered?
>
It was reported to us by Michael Gruhn & Christian Moch
>
> Was it found with fuzzing or code inspection?
>
I do not know, there was no info on the discovery method in the report.
>
> I have done fuzzing on partitioning tools before, however I hadn't
> found anything, this bug indicates I haven't looked enough :-)
>
I looked at other projects to see what is being done to prevent this
particular loop from happening. Until now, tools I checked are protected
either by detecting the loop (i.e.: actively searching for a relative
offset of 0 for the next EBR, as done by this util-linux patch; partprobe
and fdisk are doing that), or enforcing a limit on the maximum number of
partitions for a device (Linux kernel, kpartx & other tools I currently
checked)
>
>
> --
> Hanno Böck
> https://hboeck.de/
>
> mail/jabber: hanno@...eck.de
> GPG: BBB51E42
>
--
Cedric Buissart,
Product Security
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
