Date: Fri, 21 Jan 2000 14:35:16 -0700 From: Brett Glass <brett@lariat.org> To: Jared Mauch <jared@puck.nether.net> Cc: Wes Peters <wes@softweyr.com>, TrouBle <trouble@netquick.net>, security@FreeBSD.ORG Subject: Re: stream.c worst-case kernel paths Message-ID: <4.2.2.20000121143004.01908960@localhost> In-Reply-To: <20000121162059.Y30675@puck.nether.net> References: <4.2.2.20000121140941.01a68b30@localhost> <200001211415.BAA12772@cairo.anu.edu.au> <20000121.16082400@bastille.netquick.net> <3888C7D2.D82BE362@softweyr.com> <4.2.2.20000121140941.01a68b30@localhost>
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That's what I thought. This is really pathological. Why do we allow ourselves to send a RST to a multicast address, or accept an ACK from one? Could lower layers of the stack flag the ACK as coming from a multicast address so that we can nuke it before (or as) it hits the TCP layer? I can imagine a whole potential family of exploits involving multicast addresses and TCP. --Brett At 02:20 PM 1/21/2000 , Jared Mauch wrote: > In the multicast world you only send UDP (or other types), you >do not send tcp packets out, because you can't do a three-way >handshake. > > - jared > >On Fri, Jan 21, 2000 at 02:10:23PM -0700, Brett Glass wrote: > > At 01:55 PM 1/21/2000 , Wes Peters wrote: > > > > >Be warned if you're using the exploit program: if you select random > > >addresses, it may (will) pick multicast IP addresses, which may have > > >unintended side affects on your network. Augh! > > > > Geeze. Is it even LEGAL to ACK multicast packets? > > > > --Brett > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > with "unsubscribe freebsd-security" in the body of the message > >-- >Jared Mauch | pgp key available via finger from jared@puck.nether.net >clue++; | http://puck.nether.net/~jared/ My statements are only mine. >END OF LINE | To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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