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Date: Mon, 19 Feb 2001 03:23:29 +0900 (JST)
Message-Id: <20010219.032329.130242115.hrs@eos.ocn.ne.jp>
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From: Hiroki Sato <hrs@eos.ocn.ne.jp>
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Subject: Re: ANNOUNCE: FreeBSD Security Advisory: FreeBSD-SA-01:09.crontab [REVISED]
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FreeBSD $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG(B
=============================================================================
FreeBSD-SA-01:09 (2001-01-25)
 * crontab allows users to read certain files [REVISED]
=============================================================================

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

  Subject: FreeBSD Security Advisory: FreeBSD-SA-01:09.crontab [REVISED]
  From: FreeBSD Security Advisories <security-advisories@FreeBSD.org>
  Date: Thu, 25 Jan 2001 13:01:37 -0800 (PST)
  Message-Id: <200101252101.f0PL1bs78217@freefall.freebsd.org>
  X-Sequence: announce-jp 672

 $B$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-01:09                                           Security Advisory
                                                                FreeBSD, Inc.

$B%H%T%C%/(B:	crontab allows users to read certain files [REVISED]

$BJ,N`(B:		core
$B%b%8%e!<%k(B:	crontab
$B9pCNF|(B:		2001-01-23
$B2~D{F|(B:		2001-01-25
$B%/%l%8%C%H(B:	Kyong-won Cho <dubhe@HACKERSLAB.COM>
		$B=$@5%Q%C%ADs6!(B: OpenBSD (Todd Miller <millert@openbsd.org>)
$B1F6AHO0O(B:	FreeBSD 3.x ($BA4%j%j!<%9(B),
                FreeBSD 4.x (4.2 $B$h$jA0$NA4%j%j!<%9(B)
                $B=$@5F|0JA0$N(B FreeBSD 3.5.1-STABLE $B$*$h$S(B 4.1.1-STABLE
$B=$@5F|(B:		2000-11-11 (FreeBSD 4.1.1-STABLE)
		2000-11-20 (FreeBSD 3.5.1-STABLE)
FreeBSD $B$K8GM-$+(B:	No


0.   $B2~D{MzNr(B - Revision History

v1.0  2001-01-23  $B=iHG8x3+(B
v1.1  2001-01-25  $B=$@5%Q%C%A$NDs6!85$G$"$k(B OpenBSD $B$N%/%l%8%C%H$r99?7(B


I.   $BGX7J(B - Background

crontab(8) $B$O(B, $BFCDj$N;~4V$K<B9T$9$k$h$&$K%8%g%V$r%9%1%8%e!<%k$9$k(B
cron $B%G!<%b%sMQ$N(B crontab(5) $B%U%!%$%k$rJT=8$9$k%W%m%0%i%`$G$9(B.


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

crontab(8) $B$K$O(B, $B%m!<%+%k%f!<%6$,%7%9%F%`>e$K$"$k(B crontab(5) $B$N(B
$BJ8K!$KB'$C$?7A<0$r;}$D(B, $B$9$Y$F$N%U%!%$%k$rFI$`$3$H$,$G$-$k$H$$$&(B
$B%;%-%e%j%F%#>e$N<eE@$,H/8+$5$l$F$$$^$9(B.  $BFI$`$3$H$N$G$-$k%U%!%$%k$O(B
crontab(5) $BJ8K!$KB'$kI,MW$,$"$j(B, $B<!$N$h$&$J$b$N$K8B$i$l$^$9(B.

* $BM-8z$J(B crontab(5) $B%U%!%$%k$G$"$k$+(B,
* $B%U%!%$%kA4BN$,%3%a%s%H%"%&%H$5$l$F$$$k$b$N(B, $B$D$^$j$9$Y$F$N9T$,(B
  $B6uGr$N$_$N9T(B, $B$b$7$/$O(B '#' $BJ8;z$+$i;O$^$C$F$$$k9T$K$J$C$F$$$k$b$N(B.

$B$3$N%;%-%e%j%F%#>e$N<eE@$K$h$k:G$bBg$-$J1F6A$O(B, $BB>$N%f!<%6$N(B
crontab $B%(%s%H%j$,K=O*$5$l$k$3$H$G$9(B.  crontab $B%(%s%H%j$K$O(B
$BG'>Z80$N?dB,$r2DG=$K$9$k$h$&$J=EMW$J>pJs$,4^$^$l$F$$$k2DG=@-$,$"$j$^$9(B
($B$?$@$7(B, $B$=$l$i$O(B crontab $B%8%g%V$N<B9T;~$K(B, $B%W%m%;%9$N0z?t$d(B
$B4D6-JQ?t$J$I$r7PM3$7$F8x3+$5$l$F$7$^$&$3$H$b$"$j$^$9(B).

FreeBSD 4.1.1 $B$r4^$`(B, $B=$@5F|0JA0$N$9$Y$F$N(B FreeBSD $B%j%j!<%9$,(B
$B$3$N%;%-%e%j%F%#<eE@$N1F6A$r<u$1$^$9(B.
$B$3$NLdBj$O(B, FreeBSD 4.2 $B$N8x3+A0$K=$@5$5$l$^$7$?(B.


III. $B1F6AHO0O(B - Impact

$B0-0U$r;}$C$?%m!<%+%k%f!<%6$O(B, $BM-8z$J(B crontab $BJ8K!$KB'$C$?(B
$BG$0U$N%m!<%+%k%U%!%$%k$rFI$`$3$H$,2DG=$G$9(B.


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

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

1) crontab $B$N(B $B5v2D(B/$B5qH](B (allow/deny) $B%U%!%$%k(B (/var/cron/allow
   $B$*$h$S(B /var/cron/deny) $B$r;H$C$F(B cronrab(8) $B%f!<%F%#%j%F%#$K(B
   $B;HMQ@)8B$r@_$1$^$9(B.

2) /usr/sbin/crontab $B$+$i(B setuid $B8"8B$r<h$j=|$-$^$9(B.
   $B$?$@$7(B, $B$3$&$9$k$H(B root $B%f!<%60J30$N%f!<%6$O(B cron $B$r(B
   $B;H$&$3$H$,$G$-$J$/$J$j$^$9(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=$@5F|0J9_$N(B 3.5-STABLE $B$b$7$/$O(B
4.1.1-STABLE $B$K%"%C%W%0%l!<%I$7$^$9(B.

2) $B0J2<$N>l=j$K$"$k=$@5%Q%C%A$r8=:_MxMQCf$N%7%9%F%`$KE,MQ$7$F(B,
   root $B8"8B$G0J2<$N%3%^%s%I$r<B9T$7$^$9(B.

ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-01:09/crontab-4.x.patch
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-01:09/crontab-4.x.patch.asc

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

# cd /usr/src/usr.sbin/cron/crontab
# patch -p < /path/to/patch
# make depend && make all install


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.

