[oss-security] CVE Request : IPv6 Hop limit lowering via RA messages

[Loganaden Velvindron]

On Fri, Apr 3, 2015 at 1:54 PM, D.S. Ljungmark <ljungmark at modio.se> wrote:
> On Fri, Apr 3, 2015 at 6:06 AM, Jim Thompson <jim at netgate.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

It is vulnerable. Harrison Grundy and I worked on a patch, and sent it
to secteam at .


>
>
> 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 at eitanadler.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 at modio.se>
>>> Date: 2 April 2015 at 10:19
>>> Subject: [oss-security] CVE Request : IPv6 Hop limit lowering via RA messages
>>> To: oss-security at lists.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 at freebsd.org mailing list
>>> http://lists.freebsd.org/mailman/listinfo/freebsd-net
>>> To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"
>>



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