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FreeBSD $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG(B
=============================================================================
FreeBSD-SA-02:02 (2002-01-04)
 * pw(8) race condition may allow disclosure of master.passwd
=============================================================================

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

  Subject: ANNOUNCE: FreeBSD Security Advisory FreeBSD-SA-02:02.pw
  From: FreeBSD Security Advisories <security-advisories@FreeBSD.ORG>
  Date: Fri, 4 Jan 2002 17:04:21 -0800 (PST)
  Message-Id: <200201050104.g0514Lc93004@freefall.freebsd.org>
  X-Sequence: announce-jp 885 

 $B$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~$6$s$5$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-02:02                                            Security Advisory
                                                                FreeBSD, Inc.

$B%H%T%C%/(B:	pw(8) $B$N6%9g>uBV$K$h$k(B master.passwd $BO31L$N4m81@-(B
                (pw(8) race condition may allow disclosure of master.passwd)

$BJ,N`(B:		core
$B%b%8%e!<%k(B:	pw
$B9pCNF|(B:		2002-01-04
$B%/%l%8%C%H(B:	ryan beasley <ryanb@goddamnbastard.org>
$B1F6AHO0O(B:	4.5-RELEASE $B$h$jA0$N$9$Y$F$N%j%j!<%9(B
                $B=$@5F|0JA0$N(B 4.4-STABLE
$B=$@5F|(B:		2001-12-21 15:21:32 UTC (4.4-STABLE, $BJLL>(B RELENG_4)
                2001-12-21 15:22:55 UTC (4.4-RELEASEp1, $BJLL>(B RELENG_4_4)
                2001-12-21 15:23:04 UTC (4.3-RELEASEp21, $BJLL>(B RELENG_4_3)
FreeBSD $B$K8GM-$+(B:	YES


I.   $BGX7J(B - Background

pw(8) $B$O(B, $B%7%9%F%`$N%f!<%6$H%0%k!<%W$r:n@.(B/$B:o=|(B/$BJQ99(B/$BI=<($9$k$?$a$K(B
$B;H$o$l$k%f!<%F%#%j%F%#$G$9(B.


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

$B%7%9%F%`>e$N%f!<%6$r:n@.(B, $B:o=|(B, $BJQ99$9$k:](B, pw $B%f!<%F%#%j%F%#$O(B
$B%7%9%F%`%Q%9%o!<%I%U%!%$%k(B `/etc/master.passwd' $B$rJQ99$7$^$9(B.
$B$3$N%U%!%$%k$K$O0E9f2=$5$l$?%f!<%6%Q%9%o!<%I$,3JG<$5$l$F$*$j(B,
$BDL>o$O(B root $B$N$_$,FI$_=P$;$k$h$&$K$J$C$F$$$^$9(B.  pw $B$,$3$N%U%!%$%k$r(B
$BJQ99$7$F$$$k4V(B, $B0l;~E*$K%Q%9%o!<%I%U%!%$%k$N%3%T!<$,:n@.$5$l$k$N$G$9$,(B,
$B$3$N0l;~%U%!%$%k$OITE,@Z$J5v2DB0@-$G:n@.$5$l$F$*$j(B, $B$9$Y$F$N%f!<%6$+$i(B
$BFI$_=P$72DG=$K$J$C$F$$$^$9(B.


III. $B1F6AHO0O(B - Impact

$B%m!<%+%k$N967b<T$O(B pw(8) $B$N:n@.$9$k0l;~%U%!%$%k$rFI$_(B, $B3MF@$7$?(B
$B0E9f2=$5$l$?%Q%9%o!<%I$K%*%U%i%$%s<-=q967b$r2C$($k$3$H$,2DG=$G$9(B.
$B$3$N967b$K@.8y$9$k$H(B, 1 $B$D(B, $B$b$7$/$OJ#?t$N%Q%9%o!<%I$,I|85$G$-$^$9(B.
$B$?$@$70l;~%U%!%$%k$OC;;~4V$7$+B8:_$7$J$$(B ($B:n@.$N$[$\D>8e$K(B
$B:o=|$5$l$k(B) $B$?$a(B, $B<B:]$K$3$N<eE@$r0-MQ$9$k$3$H$O:$Fq$G$9(B.
$B$D$^$j967b<T$O(B, $B$3$N%U%!%$%k$,:o=|$5$l$kA0$K%U%!%$%k$r(B
$BFI$_=P$9$H$$$&6%9g>uBV$KBG$A>!$DI,MW$,$"$j$^$9(B.


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

1) $B%7%9%F%`%f!<%6$N:n@.(B, $B:o=|(B, $BJQ99$K(B pw(8) $B$r;H$o$J$$$G$/$@$5$$(B.


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

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

1) $B<eE@$r;}$C$?(B FreeBSD $B%7%9%F%`$r(B, $B$=$l$>$l=$@5F|0J9_$N(B
   4-STABLE, 4.4-RELEASE $B%;%-%e%j%F%#%V%i%s%A(B (RELENG_4_4),
   4.3-RELEASE $B%;%-%e%j%F%#%V%i%s%A(B (RELENG_4_3) $B$K%"%C%W%0%l!<%I$7$^$9(B.

2) $B=$@5F|0JA0$N(B FreeBSD 4.x $B%7%9%F%`$N>l9g(B:

$B<!$N=$@5%Q%C%A$O(B, FreeBSD 4.3-RELEASE, 4.4-RELEASE, $B=$@5F|0JA0$N(B 4-STABLE $B$K(B
$BBP$7$FE,MQ2DG=$J$3$H$,3NG'$5$l$F$$$k$b$N$G$9(B.  $B$=$l$h$j$b8E$$%j%j!<%9$d(B
$B%5%]!<%H$5$l$F$$$J$$(B FreeBSD $B%j%j!<%9$KBP$7$F$O(B, $B$3$l$i$N=$@5%Q%C%A$,(B
$B@5$7$/E,MQ$G$-$J$$2DG=@-$,$"$j$^$9(B.

$B=$@5%Q%C%A$H(B PGP $B=pL>$r<!$N>l=j$+$i%@%&%s%m!<%I$7$F(B,
PGP $B%f!<%F%#%j%F%#$r;H$C$F(B PGP $B=pL>$r3NG'$7$^$9(B.

ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-02:02/pw.patch
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-02:02/pw.patch.asc

$B$=$7$F(B root $B8"8B$G0J2<$N%3%^%s%I$r<B9T$7$^$9(B.

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/usr.sbin/pw
# make depend && make all install


VI.  $B=$@5$N>\:Y(B - Correction details

$B<!$NI=$O(B, $B:#2s=$@5$5$l$?(B FreeBSD $B$N%=!<%9%U%!%$%k$N(B
$FreeBSD$ $B%j%S%8%g%sHV9f$G$9(B.

$B%Q%9L>(B                                                          $B%j%S%8%g%s(B
  $B%V%i%s%A(B
- -------------------------------------------------------------------------
src/usr.sbin/pw/pwupd.c
  HEAD (CURRENT)                                                     1.18
  RELENG_4 (4-STABLE)                                            1.12.2.4
  RELENG_4_4 (4.4-RELEASE security branch)                   1.12.2.3.4.1
  RELENG_4_3 (4.3-RELEASE security branch)                   1.12.2.3.2.1
- -------------------------------------------------------------------------


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.

