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From: Hiroki Sato <hrs@eos.ocn.ne.jp>
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Subject: Re: ANNOUNCE: FreeBSD Security Advisory FreeBSD-SA-02:41.smrsh [REVISED]
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FreeBSD $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG(B
=============================================================================
FreeBSD-SA-02:41.smrsh (2002-11-15)
 * smrsh restrictions can be bypassed [REVISED]
=============================================================================

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

  Subject: ANNOUNCE: FreeBSD Security Advisory FreeBSD-SA-02:41.smrsh [REVISED]
  From: FreeBSD Security Advisories <security-advisories@FreeBSD.org>
  Date: Fri, 15 Nov 2002 05:51:51 -0800
  Message-Id: <200211151351.gAFDppWq008458@freefall.freebsd.org>
  X-Sequence: announce-jp 1071

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

 $B86J8$O(B PGP $B=pL>$5$l$F$$$^$9$,!"$3$NF|K\8lLu$O(B PGP $B=pL>$5$l$F$$$^$;$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$O!"86J8$r;2>H$7$F$/$@$5$$!#(B

 $BF|K\8lLu$*$h$S%_%i!<%5%$%HMxMQ$N>\:Y$K$D$$$F$O!"J8Kv$N!V(BA. FreeBSD
 $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG$K$D$$$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-02:41.smrsh                                      Security Advisory
                                                          The FreeBSD Project

$B%H%T%C%/(B:       smrsh $B$N@)8B$,%P%$%Q%9$G$-$kLdBj(B
                (smrsh restrictions can be bypassed [REVISED])
$BJ,N`(B:           core
$B%b%8%e!<%k(B:     contrib_sendmail
$B9pCNF|(B:		2002-11-15
$B%/%l%8%C%H(B:     zen-parse <zen-parse@gmx.net>,
                Pedram Amini <pamini@idefense.com>,
                iDEFENSE <URL:http://www.idefense.com/>
$B1F6AHO0O(B:       FreeBSD 4.7-RELEASE $B$h$jA0$N$9$Y$F$N%j%j!<%9(B
$B=$@5F|(B:         2002-10-08 00:53:31 UTC (RELENG_4)
                2002-10-08 00:57:20 UTC (RELENG_4_7)
                2002-10-26 21:11:30 UTC (RELENG_4_6)
                2002-10-26 21:10:59 UTC (RELENG_4_5)
                2002-10-26 21:10:22 UTC (RELENG_4_4)
                2002-10-26 21:08:42 UTC (RELENG_4_3)
FreeBSD $B$K8GM-$+(B:       NO


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

v1.0  2002-11-12  $B=iHG8x3+(B
v1.1  2002-11-15  $B=$@5%Q%C%AE,MQ<j=g$N2~D{!#2sHrJ}K!$N2~D{!#(B
                  CVE $B;29M;qNA$NDI2C!#(B


I.   $BGX7J(B - Background

sendmail Restricted Shell $B%3%^%s%I(B (smrsh) $B$O!"(Bsendmail $B$G;H$o$l$k(B
$B%7%9%F%`%7%'%k(B (/bin/sh) $B$NBeBXIJ$G$9!#(Bsmrsh $B$O!"(Bsendmail $B7PM3$G(B
$B<B9T2DG=$J%W%m%0%i%`$r$"$k0l$D$N%G%#%l%/%H%j$NCf$KB8:_$9$k$b$N$K(B
$B@)8B$9$k5!G=$H!"8BDj$5$l$?AH$_9~$_%3%^%s%I$rHw$($F$$$^$9!#(B


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

smrsh $B$O(B "||" $B$d%9%Z!<%9$,4^$^$l$k%3%^%s%I%i%$%s0z?t$N=hM}$K(B
$B%P%0$,$"$j!"$=$l$rMxMQ$9$k$3$H$G@)8B$5$l$?%G%#%l%/%H%j$N30$K(B
$B$"$k%3%^%s%I$r<B9T$G$-$k2DG=@-$,$"$j$^$9!#%3%^%s%I%i%$%s0z?t$O(B
$B%m!<%+%k%f!<%6$N!V(B.forward$B!W%U%!%$%k$G;XDj$G$-$k$?$a!"(B
$B$=$N$h$&$J%U%!%$%k$KFC<l$J@_Dj$r;\$9$3$H$G(B smrsh $B$N@)8B$r(B
$BL58z$K$G$-$k2DG=@-$,$"$j$^$9!#(B


III. $B1F6AHO0O(B - Impact

$B%m!<%+%k%"%+%&%s%H$r;}$A!"!V(B.forward$B!W%U%!%$%k$r:n@.!&JQ99$G$-$k(B
$B%f!<%6$O!"(Bsmrsh $B$N@)8B$r1*2s$9$k$3$H$,2DG=$G$9!#$3$l$O$D$^$j!"(B
$B%m%0%$%s%7%'%k$X$N%"%/%;%9$r86B'$H$7$F6X;_$7$F$$$k%7%9%F%`>e$N(B
$B%m!<%+%k%f!<%6$,!"$3$N%P%0$r0-MQ$7$F<+?H$N8"8B$GG$0U$N%3%^%s%I$r(B
$B<B9T$G$-$k2DG=@-$,$"$k!"$H$$$&$3$H$G$9!#(B


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

[$B=iHG$K=q$+$l$F$$$?2sHrJ}K!$b8z2L$O$"$j$^$9!#$?$@$7!"(B
 $BB>$KI,MW$J5!G=$NB?$/$b;H$($J$/$J$j$^$9(B]

sendmail $B$N@_Dj$K$*$$$F!"%W%m%0%i%`$X$NG[Aw$rL58z$K$7$F$/$@$5$$!#(B
$B%W%m%0%i%`$X$NG[Aw$rL58z$K$9$k$K$O!"(Bsendmail.mc $B%U%!%$%k$K<!$N9T$rDI2C$7$F(B
sendmail.cf $B@_Dj%U%!%$%k$r:F@8@.$7!"(Bsendmail $B$r:F5/F0$7$^$9!#(B

    MODIFY_MAILER_FLAGS(`LOCAL', `-|')


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

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

1) $B<eE@$r;}$C$?(B FreeBSD $B%7%9%F%`$r:G?7$N(B 4.7-STABLE $B$K%"%C%W%0%l!<%I$9$k!#(B
   $B$"$k$$$O!"=$@5F|0J9_$N(B RELENG_4_7$B!"(BRELENG_4_6$B!"(BRELENG_4_5$B!"(B
   RELENG_4_4$B!"(BRELENG_4_3 $B%;%-%e%j%F%#%V%i%s%A$N$$$:$l$+$K%"%C%W%0%l!<%I$9$k!#(B

2) $B8=:_$N%7%9%F%`$K=$@5%Q%C%A$rE,MQ$9$k!#(B

$B0J2<$N=$@5%Q%C%A$O!"(BFreeBSD 4.4$B!"(BFreeBSD 4.5$B!"(BFreeBSD 4.6 $B$N3F%7%9%F%`$K(B
$BE,MQ2DG=$J$3$H$,3NG'$5$l$F$$$k$b$N$G$9!#(B

a) $B0J2<$N>l=j$+$i=$@5%Q%C%A$r%@%&%s%m!<%I$7!"(BPGP $B%f!<%F%#%j%F%#$r;H$C$F(B
   PGP $B=pL>$r3NG'$7$^$9!#(B

# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:41/smrsh.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:41/smrsh.patch.asc

b) root $B8"8B$G<!$N%3%^%s%I$r<B9T$7$^$9!#(B

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/libsm
# make depend && make
# cd /usr/src/lib/libsmutil
# make depend && make
# cd /usr/src/usr.sbin/sendmail
# make depend && make && make install

 ($BLuCm(B: /path/to/patch $B$NItJ,$O=$@5%Q%C%A$N%Q%9L>$KCV$-49$($F$/$@$5$$(B)


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

FreeBSD $B$K$*$$$F:#2s=$@5$5$l$?3F%U%!%$%k$N%j%S%8%g%sHV9f$O!"0J2<$N$H$*$j$G$9!#(B

$B%Q%9L>(B                                                          $B%j%S%8%g%s(B
  $B%V%i%s%A(B
- -------------------------------------------------------------------------
src/contrib/sendmail/smrsh/smrsh.c
  RELENG_4                                                        1.3.6.9
  RELENG_4_7                                                  1.3.6.8.2.1
  RELENG_4_6                                                  1.3.6.6.2.1
  RELENG_4_5                                                  1.3.6.5.4.1
  RELENG_4_4                                                  1.3.6.5.2.1
  RELENG_4_3                                                  1.3.6.4.2.1
- -------------------------------------------------------------------------


VII. $B;29M;qNA(B - References

<URL:http://www.idefense.com/advisory/10.01.02.txt>
<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1165>


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$9!#2a5n$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

$B$?$@$7K]Lu<T$*$h$S(B doc-jp $B$O!"$=$NFbMF$K$D$$$F$$$+$J$kJ]>Z$b(B
$B$$$?$7$^$;$s$N$G$4Cm0U$/$@$5$$!#F|K\8lLu$K$D$$$F$N$40U8+!"$4MWK>!"(B
$B$*Ld$$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$$$k(B WWW $B%5%$%H(B http://www.FreeBSD.org/ $B$*$h$S(B
FTP $B%5%$%H(B ftp://ftp.FreeBSD.org/ $B$K$O(B, $BF|K\$N%_%i!<%5%$%H$,B8:_$7$^$9!#(B
$B%M%C%H%o!<%/$N:.;($r4KOB$9$k$?$a!"$^$:$O%_%i!<%5%$%H$NMxMQ$r(B
$B9MN8$9$k$h$&$*4j$$$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$r4^$`%_%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
