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Subject: Re: ANNOUNCE: FreeBSD Security Advisory: FreeBSD-SA-00:21.ssh
 [REVISED]
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 $B$3$N%a!<%k$O(B, announce-jp $B$KN.$l$?(B

  Subject: ANNOUNCE: FreeBSD Security Advisory: FreeBSD-SA-00:21.ssh [REVISED]
  From: FreeBSD Security Advisories <security-advisories@freebsd.org>
  Date: Wed,  7 Jun 2000 17:17:16 -0700 (PDT)
  Message-Id: <20000608001716.C549937BF12@hub.freebsd.org>
  X-Sequence: announce-jp 455

 $B$rF|K\8lLu$7$?$b$N$G$9(B. 

 $B86J8$O(B PGP $B=pL>$5$l$F$$$^$9$,(B, $B$3$NF|K\8lLu$O(B PGP $B=pL>$5$l$F$$$^$;$s(B. 
 $B%Q%C%AEy$NFbMF$,2~cb$5$l$F$$$J$$$3$H$r3NG'$9$k$?$a$K(B PGP $B$N%A%'%C%/$r(B
 $B9T$J$&$K$O(B, $B86J8$r;2>H$7$F$/$@$5$$(B. 

 $BF|K\8lLu$O(B FreeBSD $BF|K\8l%I%-%e%a%s%F!<%7%g%s%W%m%8%'%/%H(B(doc-jp)$B$,;29M$N(B
 $B$?$a$KDs6!$9$k$b$N$G(B, doc-jp $B$O(B $B$=$NFbMF$K$D$$$F$$$+$J$kJ]>Z$b$$$?$7$^$;$s(B.
 $BF|K\8lLu$K$D$$$F$N$*Ld$$9g$o$;$O(B doc-jp@jp.FreeBSD.org $B$^$G$*4j$$$7$^$9(B.

--($B$3$3$+$i(B)
=============================================================================
FreeBSD-SA-00:21                                           Security Advisory
                                                                FreeBSD, Inc.

$B%H%T%C%/(B:	ssh port listens on extra network port [REVISED]

$BJ,N`(B:		ports
$B%b%8%e!<%k(B:	ssh
$B9pCNF|(B:		2000-06-07
$B%/%l%8%C%H(B:	Jan Koum <jkb@best.com>
$B1F6AHO0O(B:	Ports collection
$B=$@5F|(B:		2000-04-21 
FreeBSD $B$K8GM-$+(B:	Yes

I.   $BGX7J(B - Background

SSH $B$O(B, $B%M%C%H%o!<%/>e$N%^%7%s4V$K$*$1$kDL?.$N0E9f2=$HG'>Z$rDs6!$9$k(B
Secure Shell protocol $B$N<BAu$G$9(B.

II.  $BLdBj$N>\:Y(B - Problem Description

2000$BG/(B1$B7n(B14$BF|$K(B SSH $B$N(B FreeBSD $B$N(B port $B$KDI2C$5$l$?%Q%C%A$G$O(B, SSH $B%G(B
$B!<%b%s$N@_Dj$,ITE,@Z$J$b$N$K$J$C$F$*$j(B, SSH $B$NDL>o$N%5!<%S%9%]!<%H$G$"(B
$B$k(B 22$BHV$K2C$($F(B, 722$BHV%]!<%H$G$b(B listen $B$9$k$h$&$K$J$C$F$$$^$9(B. $B$3$NJQ(B
$B99$O(B, SSH $B%5!<%P$,J#?t$N%]!<%H$G(B listen $B$G$-$k$h$&$K$9$k$?$a$N$b$N$G$7(B
$B$?$,(B, $B$=$N%*%W%7%g%s$,ITE,@Z$K$b%G%U%)%k%H$GM-8z$K$J$C$F$$$^$7$?(B.

$B$3$N$?$a(B, $BDI2C$5$l$k%5!<%S%9%]!<%H$K$D$$$F(B, $BI8=`$N(B SSH $B$N%5!<%S%9%]!<(B
$B%H$HF1$8%"%/%;%9@)8f$r$+$1$F$$$J$1$l$P(B, $B%5%$%H$N%;%-%e%j%F%#%]%j%7$K(B
$B0cH?$9$k2DG=@-$,$"$j$^$9(B.

$B$3$NLdBj$O(B SSH $B%=%U%H%&%'%"<+BN$K4XO"$9$k<eE@$G$O$"$j$^$;$s(B.  $B$^$?(B, 
SSH $B%5!<%P$NHsI8=`$N%]!<%H$K%"%/%;%9$9$k>l9g$b(B, $B%j%b!<%H%f!<%6$OM-8z$J(B 
SSH $B$N>ZL@=q$r;}$C$F$$$kI,MW$,$"$k$?$a(B, $B%$%s%9%H!<%k$5$l$?%7%9%F%`$NBg(B
$BB??t$K$H$C$F$O4m81$J$b$N$G$O$J$$$G$7$g$&(B.  $BLdBj$O(B, SSH $B$NI8=`%]!<%H$X(B
$B%"%/%;%9$,5v2D$5$l$F$$$J$$(B IP $B%"%I%l%9$+$i(BSSH $B%5!<%P$K%"%/%;%9$9$k$3$H(B
$B$,$G$-$F$7$^$&2DG=@-$,$"$k(B, $B$H$$$&$3$H$G$9(B.

ssh $B$N(B port $B$O%G%U%)%k%H$G%$%s%9%H!<%k$5$l$k$b$N$G$O$J$/(B, FreeBSD $B%7%9(B
$B%F%`$N0lIt$r9=@.$9$k$b$N$G$b$"$j$^$;$s(B. $B$=$l$i$O(B, 3300 $B$rD6$($k%5!<%I(B
$B%Q!<%F%#@=$N%"%W%j%1!<%7%g%s$,$9$0$K%$%s%9%H!<%k$G$-$k7A$G<}$a$i$l$F$$(B
$B$k(B FreeBSD Ports Collection $B$N0lIt$G$9(B. FreeBSD 4.0 $B$H$H$b$K=P2Y$5$l$?(B 
ports $B%3%l%/%7%g%s$O(B, $B%j%j!<%98e$KLdBj$,8+$D$+$C$?$?$a$K$3$NLdBj$r4^$s(B
$B$G$$$^$9(B.

FreeBSD $B$G$O(B, $B$3$N$h$&$J%5!<%I%Q!<%F%#@=%"%W%j%1!<%7%g%s$N%;%-%e%j%F%#(B
$BLdBj$KBP$7$F(B, $BFC$K2?$+$r<gD%$9$k$3$H$O$"$j$^$;$s(B ($BLuCm(B: Ports
Collection $B$KF~$C$F$$$k$+$i$H$$$C$F(B, FreeBSD $B$N3+H/<T$?$A$,$=$N%"%W%j(B
$B%1!<%7%g%s$,0BA4$G$"$k$HI>2A$7$?$o$1$G$O$"$j$^$;$s(B). $B$?$@$7(B, $B%;%-%e%j(B
$B%F%#LdBj$KBP$7$FBg$-$J1F6A$r;}$D$h$&$J(B ports $B$KBP$9$k%;%-%e%j%F%#4F::(B
$B$rDs6!$9$Y$/(B, $B8=:_EXNOCf$G$9(B. 

FreeBSD 4.0 $B$K$O(B, SSH $B%W%m%H%3%k$N%U%j!<$N<BAu$G$"$k(B OpenSSH $B$,(B base 
$B%7%9%F%`Cf$K4^$^$l$F$$$^$9(B. OpenSSH $B$G$O(B, $B$3$N@_Dj%_%9$NLdBj$O$"$j$^$;(B
$B$s(B.

III. $B1F6AHO0O(B - Impact

$B@5Ev$J(B SSH $B$N>ZL@=q$r;}$D%j%b!<%H$N%f!<%6$,(B, $BHsI8=`$N%]!<%H$G(B listen 
$B$7$F$$$k(B SSH $B%5!<%P$K%"%/%;%9$9$k$3$H$,2DG=$G$9(B. $B$3$l$K$h$j(B, $BI8=`$N(B 
SSH $B$N%5!<%S%9%]!<%H$K$D$$$F(B IP $B%"%I%l%9$G$N%"%/%;%9@)8f$r9T$J$C$F$$$k(B
$B>l9g(B, $B$3$l$r2sHr$9$k$3$H$,$G$-$F$7$^$&4m81@-$,$"$j$^$9(B.

ssh $B$N(B port/package $B$r%$%s%9%H!<%k$7$F$$$J$1$l$P(B, $B$^$?$O(B 2000$BG/(B1$B7n(B14$BF|(B
$B$h$jA0$+(B 2000$BG/(B4$B7n(B21$BF|0J9_$N(B ssh $B$N(B port/package $B$r%$%s%9%H!<%k$7$F$$(B
$B$l$P(B, $B$=$N%7%9%F%`$K$3$NLdBj$K$D$$$F$N%;%-%e%j%F%#>e$N<eE@$O$"$j$^$;$s(B.

IV.  $BBP1~:v(B - Workaround

$B0J2<$N$$$:$l$+$r9T$J$C$F$/$@$5$$(B.

1) /usr/local/etc/sshd_config $B%U%!%$%kCf$N(B "Port 722" $B$H$$$&9T$r%3%a%s(B
$B%H%"%&%H$7(B, sshd $B$r:F5/F0$9$k(B.

2) 722$BHV%]!<%H$X$N%3%M%/%7%g%s$r@)8B$9$k$h$&$K(B, $B6-3&$N%U%!%$%"%&%)!<%k(B
$B$+(B, (ipfw $B$d(B ipf $B$r;HMQ$7$F(B) $B%m!<%+%k%^%7%s$K%U%#%k%?%j%s%0%k!<%k$rDI(B
$B2C$9$k(B.

3) ssh $B$N(B port/package $B$r%$%s%9%H!<%k$7$F$$$k>l9g(B, $B$=$l$r%"%s%$%s%9%H(B
$B!<%k$9$k(B.

V.   $B=$@5=hCV(B - Solution

$B0J2<$N$$$:$l$+$r9T$J$C$F$/$@$5$$(B.

1) Ports Collection $BA4BN$r99?7$7$F(B, ssh $B$N(B port $B$r:F%3%s%Q%$%k$9$k(B.

2) $B0J2<$N>l=j$+$i(B ssh $B$N?7$7$$(B port $B%9%1%k%H%s$r%@%&%s%m!<%I$7(B,
   $B$=$l$r;HMQ$7$F(B ssh $B$N(B port $B$r:F%3%s%Q%$%k$9$k(B.

http://www.freebsd.org/ports/

3) portcheckout $B%f!<%F%#%j%F%#$r;HMQ$9$k$H(B, $B>e5-(B (2) $B$r<+F0E*$K(B
   $B9T$J$&$3$H$,$G$-$^$9(B.  portcheckout $B$O(B,
   /usr/ports/devel/portcheckout $B$d(B, $B0J2<$N>l=j$+$iF~<j2DG=$G$9(B. 

ftp://ftp.freebsd.org/pub/FreeBSD/ports/packages/devel/portcheckout-1.0.tgz

VI.   $B99?7MzNr(B - Revision History

v1.0  2000-06-07  $B=iHG8x3+(B
v1.1  2000-06-07  sshd $B@_Dj%U%!%$%kL>$N4V0c$$$r=$@5(B
