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Date: Sun, 21 Jan 2001 14:13:40 +0900 (JST)
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Subject: Re: ANNOUNCE: FreeBSD Security Advisory: FreeBSD-SA-01:01.openssh
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FreeBSD $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG(B
=============================================================================
FreeBSD-SA-01:01 (2001-01-15)
 * Hostile server OpenSSH agent/X11 forwarding
=============================================================================

 $B$3$N%a!<%k$O(B, announce-jp $B$KN.$l$?(B

  Subject: ANNOUNCE: FreeBSD Security Advisory: FreeBSD-SA-01:01.openssh
  From: FreeBSD Security Advisories <security-advisories@freebsd.org>
  Date: Mon, 15 Jan 2001 14:29:56 -0800 (PST)
  Message-Id: <20010115222956.8DEDD37B400@hub.freebsd.org>
  X-Sequence: announce-jp 656

 $B$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. 
 $B=$@5%Q%C%AEy$NFbMF$,2~cb$5$l$F$$$J$$$3$H$r3NG'$9$k$?$a$K(B PGP $B=pL>$N(B
 $B%A%'%C%/$r9T$J$&$K$O(B, $B86J8$r;2>H$7$F$/$@$5$$(B. 

 $BF|K\8lLu$*$h$S(B, $B%_%i!<%5%$%HMxMQ$N>\:Y$K$D$$$F$O(B, $BJ8Kv$N!V(BA. FreeBSD
 $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG$K$D$$$F!W$r$4Mw$/$@$5$$(B.


                                     [$BK]Lu<T(B: $B:4F#(B $B9-@8(B <hrs@jp.FreeBSD.org>]
--($B$3$3$+$i(B)

=============================================================================
FreeBSD-SA-01:01                                           Security Advisory
                                                                FreeBSD, Inc.

$B%H%T%C%/(B:	Hostile server OpenSSH agent/X11 forwarding

$BJ,N`(B:		core/ports
$B%b%8%e!<%k(B:	openssh
$B9pCNF|(B:		2001-01-15
$B%/%l%8%C%H(B:	Markus Friedl <markus@OpenBSD.org>
$B1F6AHO0O(B:	$B=$@5F|0JA0$N(B FreeBSD 4.1.1-STABLE
                $B=$@5F|0JA0$N(B Ports Collection
$B=$@5F|(B:		2000-11-14
$B%Y%s%@$NBP1~(B:	$B=$@5HG$,8x3+:Q$_(B
FreeBSD $B$K8GM-$+(B:	NO


I.   $BGX7J(B - Background

OpenSSH $B$O(B, $BG'>Z$H0E9f2=$5$l$?%M%C%H%o!<%/%"%/%;%9$rDs6!$9$k(B
SSH1 $B$*$h$S(B SSH2 $B%;%-%e%"%7%'%k%W%m%H%3%k$N<BAu$G$9(B.
$B$3$l$O;HMQ$K@)8B$,$J$/%U%j!<$GMxMQ$G$-$k$b$N$G(B, $B$$$/$D$+$N%P!<%8%g%s$,(B
FreeBSD Ports Collection $B$H(B FreeBSD $B%Y!<%9%7%9%F%`$K4^$^$l$F$$$^$9(B.


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

$B0J2<$O(B, OpenSSH $B%;%-%e%j%F%#4+9p$+$i$N0zMQ$G$9(B.

    ssh $B%/%i%$%"%s%H$N@_Dj$G(B ssh-agent $B$b$7$/$O(B X11 $B$NE>Aw$r(B
    $BL58z$K$7$F$$$k>l9g(B, ssh $B%/%i%$%"%s%H$O%;%7%g%s$N3NN);~$K(B
    $B$3$l$i$N5!G=$NMW5a$r9T$J$$$^$;$s(B.  $B$3$l$O@5$7$$F0:n$G$9(B.

    $B$7$+$7(B ssh $B%/%i%$%"%s%H$,(B ssh-agent $B$X$N%"%/%;%9MW5a$r(B
    $B<u$1$H$k>l9g$K$O(B, ssh $B%/%i%$%"%s%H$O%;%7%g%s$N3NN);~$K(B
    $B$3$l$i$N5!G=$,8r>D$5$l$F$$$k$+$I$&$+%A%'%C%/$7$^$;$s(B.
    $B$D$^$j(B, $B<u$1$H$C$?MW5a$,%/%i%$%"%s%H$N@_Dj$K9gCW$9$k$+$I$&$+(B,
    ssh-agent $B$X$N%"%/%;%9$r5v2D$9$k$+$I$&$+(B, $B$H$$$C$?%A%'%C%/$r(B
    ssh $B%/%i%$%"%s%H$,9T$J$o$J$$$N$G$9(B.  X11 $BE>Aw5!G=$N<BAu$K$b(B,
    $BN`;w$7$?LdBj$,B8:_$7$^$9(B.

$B=$@5F|0JA0$N$9$Y$F$N(B FreeBSD 4.x, $B$D$^$j(B FreeBSD 4.1 $B$*$h$S(B
FreeBSD 4.1.1 $B$,(B, $B$3$NLdBj$KBP$7$F<eE@$r;}$C$F$$$^$9(B.
$B$3$N<eE@$O(B, FreeBSD 4.2 $B$N8x3+A0$KLdBj$O=$@5$5$l$^$7$?(B.
FreeBSD 3.x $B$G$O(B OpenSSH $B$OI8=`$G%$%s%9%H!<%k$5$l$k$b$N$G$O$J$/(B,
FreeBSD Ports Collection $B$N0l$D$H$7$FDs6!$5$l$F$$$^$9(B.

FreeBSD 4.2 $B$N8x3+A0$KLdBj$,H/8+!&=$@5$5$l$?$?$a(B,
FreeBSD 4.2 $B$H$H$b$K=P2Y$5$l$F$$$k(B FreeBSD $B%Y!<%9%7%9%F%`$*$h$S(B
Ports Collection $B$K$O(B, $B$3$NLdBj$K$h$k%;%-%e%j%F%#>e$N<eE@$O(B
$BB8:_$7$^$;$s(B.


III. $B1F6AHO0O(B - Impact

$B0-0U$r;}$C$?(B SSH $B%5!<%P$O(B, $B@\B3;~$K@\B385$N(B X11 $B%G%#%9%W%l%$(B,
$B$b$7$/$O(B ssh-agent $B$K%"%/%;%9$9$k$3$H$,2DG=$G$9(B.  $B$3$l$O(B
X11 $B%;%7%g%s$rDL$8$F%Q%9%o!<%I$d0E9f80$K4XO"$9$k%G!<%?$rGA$-8+$?$j(B,
SSH $B%(!<%8%'%s%H$+$i$N(B SSH $BG'>Z>pJs$r:FMxMQ$9$k$3$H$G(B,
$B=EMW$J%G!<%?$dB>$N%M%C%H%o!<%/%"%+%&%s%H$X$N%"%/%;%9$r5v$97k2L$K(B
$B7k$SIU$/2DG=@-$,$"$j$^$9(B.


IV.  $B2sHrJ}K!(B - Workaround

$B?.Mj$G$-$J$$%[%9%H$X@\B3$9$kA0$K(B, $DISPLAY $B$*$h$S(B $SSH_AUTH_SOCK $B4D6-JQ?t$N(B
$BN>J}$r:o=|$7$F$/$@$5$$(B.  $B$?$H$($P(B, Bourne $B%7%'%k$G$O<!$N$h$&$K$7$^$9(B.

% unset SSH_AUTH_SOCK; unset DISPLAY; ssh host


V.   $B2r7h:v(B - Solution

$B<eE@$r;}$C$?(B FreeBSD $B%7%9%F%`$r=$@5F|0J9_$N(B 4.1.1-STABLE $B$b$7$/$O(B
4.2-STABLE $B$K%"%C%W%0%l!<%I$9$k$+(B, $B$"$k$$$O8=:_MxMQCf$N%7%9%F%`$K(B
$B=$@5%Q%C%A$rE,MQ$7$F(B, $B%7%9%F%`$r:F9=C[$7$F$/$@$5$$(B.

$BMxMQCf$N%7%9%F%`$K=$@5%Q%C%A$rE,MQ$9$k$K$O(B, $B0J2<$N>l=j$+$i(B
$B=$@5%Q%C%A$r%@%&%s%m!<%I$7(B, root $B8"8B$G<!$N%3%^%s%I$r<B9T$7$^$9(B.

# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-01:01/openssh.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-01:01/openssh.patch.asc

PGP $B%f!<%F%#%j%F%#$r;H$C$F(B PGP $B=pL>$r3NG'$7$^$9(B.

# cd /usr/src/crypto/openssh
# patch < /path/to/openssh.patch
# cd /usr/src/secure/lib/libssh
# make depend && make all
# cd /usr/src/secure/usr.bin/ssh
# make depend && make all install

[Ports collection]

$B<!$N$$$:$l$+$K=>$C$F$/$@$5$$(B.

1) Ports Collection $BA4BN$r%"%C%W%0%l!<%I$7(B, OpenSSH $B$N(B port $B$r:F9=C[$7$^$9(B.

2) $B8E$$(B ($BLuCm(B: OpenSSH $B$N(B) package $B$r%7%9%F%`$+$i:o=|$7(B, $B=$@5F|0J9_$K(B
   $B:n@.$5$l$??7$7$$(B package $B$r0J2<$N>l=j$+$i<hF@$7$F%$%s%9%H!<%k$7$^$9(B.

ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/security/openssh-2.2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/security/openssh-2.2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/security/openssh-2.2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/security/openssh-2.2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/security/openssh-2.2.0.tgz

$BCm0U(B: $B<j0c$$$N$?$a(B, $B%;%-%e%j%F%#LdBj=$@58e$N(B package $B$O(B
      $B%P!<%8%g%s$,99?7$5$l$F$$$^$;$s(B.  $B%$%s%9%H!<%k$7$h$&$H(B
      $B$7$F$$$k(B package $B$,=$@5F|0J9_$K:n@.$5$l$?$b$N$G$"$k$3$H$r(B
      $BI,$:3NG'$7$F$/$@$5$$(B.

3) OpenSSH $B$N?7$7$$(B port $B%9%1%k%H%s$r0J2<$N>l=j$+$i(B
   $B%@%&%s%m!<%I$7(B, $B$=$l$r;H$C$F(B port $B$r:F9=C[$7$^$9(B.

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

4) $B>e5-(B (3) $B$NA`:n$r<+F0E*$K9T$J$&(B portcheckout $B%f!<%F%#%j%F%#$r;H$$$^$9(B.
   portcheckout $B$N(B port $B$O(B /usr/ports/devel/portcheckout $B$K$"$j$^$9(B.
   $B$^$?(B, portcheckout $B$N(B package $B$,0J2<$N>l=j$+$iF~<j2DG=$G$9(B.

ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz


A.   FreeBSD $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG$K$D$$$F(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$,(B
$B;29M$N$?$a$KDs6!$9$k$b$N$G$9(B.  $B2a5n$NF|K\8lHG%;%-%e%j%F%#4+9p$O(B

 http://www.FreeBSD.org/ja/security/

$B$K$^$H$a$i$l$F$$$^$9(B.  

$B$?$@$7(B, $BK]Lu<T$*$h$S(B doc-jp $B$O(B, $B$=$NFbMF$K$D$$$F$$$+$J$kJ]>Z$b(B
$B$$$?$7$^$;$s$N$G$4Cm0U$/$@$5$$(B.  $BF|K\8lLu$K$D$$$F$N$40U8+(B, $B$4MWK>(B,
$B$*Ld$$9g$o$;Ey$O(B doc-jp@jp.FreeBSD.org $B$^$G$*4j$$$7$^$9(B.

$B$3$N4+9p$NCf$G>R2p$5$l$F$$$k(B WWW $B%5%$%H(B http://www.FreeBSD.org/ $B$*$h$S(B
FTP $B%5%$%H(B ftp://ftp.FreeBSD.org/ $B$K$O(B, $BF|K\$N%_%i!<%5%$%H$,B8:_$7$^$9(B.
$B%M%C%H%o!<%/$N:.;($r4KOB$9$k$?$a(B, $B$^$:$O%_%i!<%5%$%H$NMxMQ$r(B
$B9MN8$9$k$h$&$*4j$$$7$^$9(B.

$BF|K\$N%_%i!<%5%$%H$rMxMQ$9$k$K$O(B,
http://www.FreeBSD.org/ $B$r(B http://www.jp.FreeBSD.org/www.freebsd.org/ $B$K(B,
ftp://ftp.FreeBSD.org/ $B$r(B ftp://ftp.jp.FreeBSD.org/ $B$K(B,
$B$=$l$>$lCV$-49$($F$/$@$5$$(B.

$BB>$NCO0h$r4^$`(B, $B%_%i!<%5%$%H$K4X$9$k>\:Y$O(B,

 http://www.FreeBSD.org/handbook/mirror.html ($B1QJ8(B)
 http://www.FreeBSD.org/ja/handbook/mirror.html ($BF|K\8lLu(B)

$B$K$^$H$a$i$l$F$$$^$9(B.

