Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri, 3 Apr 2015 11:54:01 +0200
From: "D.S. Ljungmark" <ljungmark@...io.se>
To: Jim Thompson <jim@...gate.com>
Cc: Eitan Adler <lists@...anadler.com>, FreeBSD Security Team <secteam@...ebsd.org>, 
	"freebsd-net@...ebsd.org" <net@...ebsd.org>, oss-security@...ts.openwall.com
Subject: Re: CVE Request : IPv6 Hop limit lowering via RA messages

On Fri, Apr 3, 2015 at 6:06 AM, Jim Thompson <jim@...gate.com> wrote:
> have you considered that there might not be a relevant patch because FreeBSD’s implementation isn’t affected?

sys/netinet6/nd6_rtr.c

    300         if (nd_ra->nd_ra_curhoplimit)
    301                 ndi->chlim = nd_ra->nd_ra_curhoplimit;

The only "OUT" in that function I see are tests for:
  Not accepting RA
  hoplimit on current packet != 255
  not link-local
  No extended ipv6 header


Based on previous testing ( early March 2015), and reading of the
source, I say that FreeBSD is vulnerable.


Regards,
  D.S. Ljungmark


>
> Jim
>
>> On Apr 2, 2015, at 9:15 PM, Eitan Adler <lists@...anadler.com> wrote:
>>
>> + FreeBSD lists since I haven't seen any relevant patches (although I
>> might have missed them).
>>
>> ---------- Forwarded message ----------
>> From: D.S. Ljungmark <ljungmark@...io.se>
>> Date: 2 April 2015 at 10:19
>> Subject: [oss-security] CVE Request : IPv6 Hop limit lowering via RA messages
>> To: oss-security@...ts.openwall.com
>>
>>
>> An unprivileged user on a local network can use IPv6 Neighbour
>> Discovery ICMP to broadcast a non-route with a low hop limit, this
>> causing machines to lower the hop limit on existing IPv6 routes.
>>
>> Linux Patch: http://www.spinics.net/lists/netdev/msg322361.html
>> Redhat bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1203712
>>
>> Projects impacted:  Linux kernel,  NetworkManager, FreeBSD Kernel
>>
>>
>> Regards,
>>  D.S. Ljungmark
>>
>>
>> --
>> Eitan Adler
>> _______________________________________________
>> freebsd-net@...ebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-net
>> To unsubscribe, send any mail to "freebsd-net-unsubscribe@...ebsd.org"
>

Powered by blists - more mailing lists

Your e-mail address:

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.