Date: Sun, 22 Jul 2001 14:17:58 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Hajimu UMEMOTO <ume@mahoroba.org> Cc: brian@Awfulhak.org, ras@e-gerbil.net, roam@orbitel.bg, freebsd-security@FreeBSD.ORG, freebsd-gnats-submit@FreeBSD.ORG Subject: Re: bin/22595: telnetd tricked into using arbitrary peer ip Message-ID: <200107222117.f6MLHwr11669@earth.backplane.com> References: <ras@e-gerbil.net> <200107212234.f6LMYUg79964@hak.lan.Awfulhak.org> <20010723.053051.88524825.ume@mahoroba.org>
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:It is problem of w(1). `w -n' does forward lookup for IPv4 only and :IPv6 is not supported at all. When available, login(1) writes :hostname into utmp instead of IP address. If hostname is saved, `w :-n' queries A RR for the hostname. :Real problem is that UT_HOSTSIZE is too short to hold IPv6 address. :Is there any chance to expand UT_HOSTSIZE in time to 5.0-RELEASE. It :apparently breaks binary compatibility. : :-- :Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan :ume@mahoroba.org ume@bisd.hitachi.co.jp ume@{,jp.}FreeBSD.org I think if we are going to increase UT_HOSTSIZE, then 5.0 (i.e. now) is exactly the right time to do it. How large does UT_HOSTSIZE have to be to accomodate an IPV6 address? -Matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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