Date: Fri, 3 Apr 2015 13:57:02 +0400 From: Loganaden Velvindron <loganaden@...il.com> To: oss-security@...ts.openwall.com Cc: Jim Thompson <jim@...gate.com>, Eitan Adler <lists@...anadler.com>, FreeBSD Security Team <secteam@...ebsd.org>, "freebsd-net@...ebsd.org" <net@...ebsd.org> Subject: Re: CVE Request : IPv6 Hop limit lowering via RA messages On Fri, Apr 3, 2015 at 1:54 PM, D.S. Ljungmark <ljungmark@...io.se> wrote: > 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 It is vulnerable. Harrison Grundy and I worked on a patch, and sent it to secteam@. > > > 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" >> -- This message is strictly personal and the opinions expressed do not represent those of my employers, either past or present.
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