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Subject: Re: ANNOUNCE: FreeBSD Security Advisory:
 FreeBSD-SA-00:25.alpha-dev-random
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 $B$3$N%a!<%k$O(B, announce-jp $B$KN.$l$?(B

  Subject: ANNOUNCE: FreeBSD Security Advisory: FreeBSD-SA-00:25.alpha-dev-random
  From: FreeBSD Security Advisories <security-advisories@freebsd.org>
  Date: Mon, 12 Jun 2000 14:51:44 -0700 (PDT)
  Message-Id: <20000612215144.D1A3B37BBF7@hub.freebsd.org>
  X-Sequence: announce-jp 457

 $B$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-00:25                                           Security Advisory
                                                                FreeBSD, Inc.

$B%H%T%C%/(B:	FreeBSD/Alpha platform lacks kernel pseudo-random number
		generator, some applications fail to detect this.

$BJ,N`(B:		core
$B%b%8%e!<%k(B:	kernel
$B9pCNF|(B:		2000-06-12
$B1F6AHO0O(B:	$B=$@5F|$h$jA0$N(B FreeBSD/Alpha
$B=$@5F|(B:		2000-05-10 (4.0-STABLE)
		2000-04-28 (5.0-CURRENT)
FreeBSD $B$K8GM-$+(B:	Yes

I.   $BGX7J(B - Background

FreeBSD $B%+!<%M%k$O(B, /dev/random $B$*$h$S(B /dev/urandom $B%$%s%?%U%'!<%9$rDL(B
$B$8$F(B, $B0E9f$N@8@.$K;HMQ$G$-$k6/EY$r;}$D5?;wMp?tH/@84o$rDs6!$7$F$$$^$9(B.
$B$3$N5?;wMp?tH/@84o$O(B, $B%O!<%I%&%'%"E*$JB,Dj$r9T$J$$(B, $B9bIJ<A$J%(%s%H%m%T(B
$B!<(B ($BMp?t@-(B) $B8;$rDs6!$9$k$b$N$G$9(B. 

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

FreeBSD $B$N(B Alpha $BHG$G$O(B, $B%G%P%$%9(B /dev/random $B$*$h$S(B /dev/urandom $B$,Ds(B
$B6!$5$l$F$$$^$;$s$G$7$?(B. $B$3$l$O(B, $B3+H/%W%m%;%9$K$*$$$F8+2a$4$5$l$F$$$?$b(B
$B$N$G$"$j(B, Alpha $BHG$,3+H/$N%a%$%s%9%H%j!<%`$K<h$j9~$^$l$k$^$G$K=$@5$5$l(B
$B$J$$$^$^$G$-$^$7$?(B. FreeBSD $B$N(B i386 $BHG$K$O(B, $B$3$NLdBj$O$"$j$^$;$s(B. 

$B$D$^$j(B, $B=$@5F|0JA0$N(B Alpha $BHG(B FreeBSD $B$G$O(B, $B%"%W%j%1!<%7%g%s<+?H$,%(%s(B
$B%H%m%T!<$N@8@.5!9=$r;}$?$J$$8B$j(B, $B0E9f$N@8@.$K;HMQ$G$-$k$h$&$J6/EY$r;}(B
$B$C$?Mp?t$rF@$kJ}K!$,$"$j$^$;$s(B. $B$3$l$O(BFreeBSD $B%7%9%F%`$K$*$1$k7gMn$G$"(B
$B$j!"4|BT$5$l$kF0:n$H$O0[$J$C$F$$$^$9$,(B, $B$=$l<+BN$,<eE@$H$J$k$o$1$G$O$"(B
$B$j$^$;$s(B. 

$B<B:]$K%;%-%e%j%F%#>e$N<eE@$H$J$k$N$O(B, /dev/random $B$,F/$/$+$I$&$+$r@5$7(B
$B$/3NG'$G$-$:(B, /dev/random $B$,MxMQ$G$-$J$/$F$b%(%i!<$G=*N;$7$J$$$h$&$J%"(B
$B%W%j%1!<%7%g%s$,B8:_$9$k$H$$$&$3$H$G$9(B. $B$=$N>l9g(B, $B$3$N%;%-%e%j%F%#>e$N(B
$B<eE@$O8!=P$5$l$J$$$^$^$K$J$C$F$7$^$$$^$9(B. OpenSSL 0.9.4 $B$H(B, OpenSSL $B$K(B
$B4p$E$/(B OpenSSH $B$N$h$&$J%f!<%F%#%j%F%#(B ($B$I$A$i$b(B FreeBSD 4.0 $B$N%Y!<%9%7(B
$B%9%F%`$K4^$^$l$F$$$^$9(B) $B$,$3$N1F6A$r<u$1$^$9(B ($B$3$N%P%0$O(B OpenSSL 0.9.5 
$B$G=$@5$5$l$F$$$^$9(B). 

$B$7$?$,$C$F(B, $B$3$N<eE@$r;}$D(B FreeBSD/Alpha $B>e$N0E9f$K$b$H$E$/%;%-%e%j%F(B
$B%#%7%9%F%`(B ($B4^$`(B FreeBSD 4.0 $B$N%Y!<%9%7%9%F%`Cf$N(B OpenSSH) $B$K$O0E9f6/(B
$BEY>e$NLdBj$,$"$k2DG=@-$,$"$j$^$9(B. $B$^$?(B, $B$=$N$h$&$J%7%9%F%`>e$G@8@.$5$l(B
$B$?0E9f80$O?.Mj$9$Y$-$G$O$"$j$^$;$s(B. 

III. $B1F6AHO0O(B - Impact

FreeBSD/Alpha $B>e$G@8@.$5$l$?0E9f$K$*$1$kHkL)(B (OpenSSH $B$N8x3+80$dHkL)80(B
$B$J$I(B) $B$O(B, $B8x>N$5$l$F$$$k6/EY$h$j$b$:$C$H<e$$$b$N$K$J$C$F$7$^$&4m81@-$,(B
$B$"$j$^$9(B. $B$=$N>l9g(B, $B0E9f2=$5$l$?%G!<%?$O(B, $BG&BQ6/$/CN<1$N$"$k967b<T$K2r(B
$BFI$5$l$F$7$^$&4m81$,$"$j$^$9(B. 

PGP/GnuPG $B$N80$d(B, SSH $B$^$?$O(B SSH2 $B$N(B port $B$G@8@.$5$l$?80$O(B,
/dev/random $B$,F/$+$J$$$3$H$r%=%U%H%&%'%"$,@5$7$/8!=P$7(B, $B%(%s%H%m%T!<8;(B
$B$H$7$FB>$N$b$N$r;HMQ$9$k$N$G(B, $B$3$N<eE@$O$J$$$H9M$($i$l$^$9(B. $B8=:_$N$H$3(B
$B$m(B, $B<eE@$r;}$D%"%W%j%1!<%7%g%s$H$7$F3NG'$5$l$F$$$k$N$O(B OpenSSH $B$H(B 
OpenSSL $B$@$1$G$9(B. 

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

$B$"$j$^$;$s(B. 

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

1a)$B!A(B1c) $B$N$$$:$l$+$r9T$J$$(B, $B$D$$$G(B 2) $B$r9T$J$C$F$/$@$5$$(B. 

1a) FreeBSD/Alpha $B%7%9%F%`$r(B, $B=$@5F|0J9_$N(B FreeBSD 4.0-STABLE $B$K%"%C%W(B
$B%0%l!<%I$9$k(B. 

1b) $B%Q%C%AE,MQ:Q$_$N(B 4.0-RELEASE GENERIC $B%+!<%M%k$r%$%s%9%H!<%k$9$k(B. 
$B$3$N%+!<%M%k$O(B, $B0J2<$N(BURL$B$+$iF~<j$G$-$^$9(B. 

ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-00:25/kernel.gz

$BNc(B. root $B$K$J$C$F(B, $B0J2<$r<B9T$7$^$9(B. 

# fetch ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-00:25/kernel.gz
# fetch ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-00:25/kernel.gz.asc

[PGP $B%f!<%F%#%j%F%#$r;HMQ$7$F(B, $BJL%U%!%$%k$H$7$FDs6!$5$l$F$$$k(B PGP
signature $B$H>H9g$7$^$9(B. $B6qBNE*$JJ}K!$O(B, $B;HMQ$9$k(B PGP $B%f!<%F%#%j%F%#$N(B
$B%I%-%e%a%s%H$r;2>H$7$F$/$@$5$$(B]

# gunzip kernel.gz
# cp /kernel /kernel.old
# chflags noschg /kernel
# cp kernel /kernel
# chflags schg /kernel

1c) $B%+!<%M%k%=!<%9$N%Q%C%A$r%@%&%s%m!<%I$7(B, FreeBSD/Alpha $B%+!<%M%k$r:F(B
$B9=C[$7$^$9(B. $B6qBNE*$K$O(B, $B0J2<$N$h$&$K9T$J$$$^$9(B. 

# fetch ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-00:25/kernel.sys.diff

$BJL%U%!%$%k$H$7$FDs6!$5$l$F$$$k(B PGP signature $B$r%@%&%s%m!<%I$7$^$9(B. 

# fetch ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-00:25/kernel.sys.diff.asc

PGP $B%f!<%F%#%j%F%#$r;HMQ$7$F(B PGP signature $B$H>H9g$7$^$9(B. 

$B%Q%C%A$rE,MQ$7$^$9(B. 

# cd /usr/src
# patch -p < /path/to/kernel.sys.diff

$B0J2<$N%Z!<%8$K$7$?$,$C$F%+!<%M%k$r:F9=C[$7(B, $B?7$7$$%+!<%M%k$G%j%V!<%H$7(B
$B$^$9(B. 

http://www.freebsd.org/handbook/kernelconfig.html

$BCm0U(B: Alpha $BHG(B FreeBSD 4.0 $B$G$OBg$-$J2~NI$,$J$5$l$F$$$k$?$a(B, FreeBSD
3.4-STABLE $B$K$D$$$FI,MW$J=$@5$r$9$k$3$H$O(B, $B8=;~E@$G$OM=Dj$5$l$F$$$^$;(B
$B$s(B. 

2) OpenSSH $B$G@8@.$7$?$9$Y$F$N(B SSH $B$N80(B, OpenSSL $B$G@8@.$7$?$9$Y$F$N(B SSL 
$B>ZL@=q(B, FreeBSD/Alpha $B>e$G@8@.$5$l$?Mp?t$rMQ$$$F0E9f2=$5$l$?%G!<%?$r:F(B
$B@8@.$7$F$/$@$5$$(B. $B$=$l$i$N%G!<%?$O(B, $B?.Mj$G$-$k$@$1$N0E9f6/EY$r;}$C$F$$(B
$B$k$3$H$r8!>Z$G$-$^$;$s(B. [$BCm0U(B: $B:#2s$NLdBj$K$D$$$F(B, $BBgDq$N%7%9%F%`$G=E(B
$BBg$J<eE@$H$J$k$N$O(B, OpenSSH $B$G$*$h$S(B OpenSSL $B$G@8@.$7$?80$d>ZL@=q(B ($B$?(B
$B$H$($P(B SSL Web $B%5!<%PMQ$N(B) $B$@$1$G$"$k$H9M$($i$l$^$9(B]
