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Subject: [doc-jp 7469] Re: ANNOUNCE: FreeBSD Security Advisory: FreeBSD-SA-00:22.apsfilter
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$B$3$l$b$d$C$F$_$^$7$?!#(B
$B$H$$$&$3$H$G!"$I$J$?$+%A%'%C%/$*4j$$$7$^$9!#(B

$B!t;D$k$O(B FreeBSD-SA-00:25 $B$N$_!#(B

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

  Subject: ANNOUNCE: FreeBSD Security Advisory: FreeBSD-SA-00:22.apsfilter
  From: FreeBSD Security Advisories <security-advisories@freebsd.org>
  Date: Wed,  7 Jun 2000 16:21:17 -0700 (PDT)
  Message-Id: <20000607232117.5748337B8CA@hub.freebsd.org>
  X-Sequence: announce-jp 456

 $B$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-00:22                                           Security Advisory
                                                                FreeBSD, Inc.

$B%H%T%C%/(B:	apsfilter allows users to execute arbitrary commands as
		user lpd

$BJ,N`(B:		ports
$B%b%8%e!<%k(B:	apsfilter
$B9pCNF|(B:		2000-06-07
$B%/%l%8%C%H(B:	$B%Y%s%@$K$h$k=$@5(B
$B1F6AHO0O(B:	Ports collection
$B=$@5F|(B:		2000-04-29
$B%Y%s%@$N%9%F!<%?%9(B:	$B99?7$5$l$?%P!<%8%g%s$,%j%j!<%9$5$l$F$$$k(B
FreeBSD $B$K8GM-$+(B:	NO

I.   $BGX7J(B - Background

apsfilter is a print filter which automatically handles the conversion
of various types of file into a format understood by the printer.

apsfilter $B$O(B, $B$5$^$6$^$J<oN`$N%U%!%$%k$r%W%j%s%?$,=hM}$G$-$k7A<0$K<+F0(B
$BE*$KJQ49$9$k%W%j%s%H%U%#%k%?$G$9(B. 

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

The apsfilter port, versions 5.4.1 and below, contain a vulnerability
which allow local users to execute arbitrary commands as the user
running lpd, user root in a default FreeBSD installation. The
apsfilter software allows users to specify their own filter
configurations, which are read in an insecure manner and may be used
to elevate privileges.

5.4.1 $B0JA0$N%P!<%8%g%s$N(B apsfilter $B$N(B port $B$K$O(B, $B%m!<%+%k%f!<%6$,(B lpd 
$B%W%m%;%9$N%f!<%68"8B(B (FreeBSD $B$N%G%U%)%k%H$N>uBV$G$O(B root) $B$GG$0U$N%3(B
$B%^%s%I$r<B9T$G$-$F$7$^$&$H$$$&<eE@$,$"$j$^$9(B. apsfilter $B$G$O(B, $B%f!<%6$,(B
$B<+J,MQ$N%U%#%k%?$r@_Dj$G$-$k$h$&$K$J$C$F$$$^$9$,(B, $B$=$N@_Dj$O4m81$JJ}K!(B
$B$GFI$_9~$^$l$k$h$&$K$J$C$F$*$j(B, $B9b$$8"8B$rF@$k$N$KMxMQ$G$-$F$7$^$$$^$9(B. 

The apsfilter port is not installed by default, nor is it "part of
FreeBSD" as such: it is part of the FreeBSD ports collection, which
contains over 3300 third-party applications in a ready-to-install
format. The ports collection shipped with FreeBSD 4.0 contains this
problem since it was discovered after the release.

apsfilter $B$N(B port $B$O%G%U%)%k%H$G%$%s%9%H!<%k$5$l$k$b$N$G$O$J$/(B,
FreeBSD $B%7%9%F%`$N0lIt$r9=@.$9$k$b$N$G$b$"$j$^$;$s(B. $B$=$l$i$O(B, 3300 $B$r(B
$BD6$($k%5!<%I%Q!<%F%#@=$N%"%W%j%1!<%7%g%s$,$9$0$K%$%s%9%H!<%k$G$-$k7A$G(B
$B<}$a$i$l$F$$$k(B FreeBSD Ports Collection $B$N0lIt$G$9(B. FreeBSD 4.0 $B$H$H$b(B
$B$K=P2Y$5$l$?(B ports $B%3%l%/%7%g%s$O(B, $B%j%j!<%98e$KLdBj$,8+$D$+$C$?$?$a$K(B
$B$3$NLdBj$r4^$s$G$$$^$9(B.

FreeBSD makes no claim about the security of these third-party
applications, although an effort is underway to provide a security
audit of the most security-critical ports.

FreeBSD $B$G$O(B, $B$3$N$h$&$J%5!<%I%Q!<%F%#@=%"%W%j%1!<%7%g%s$N%;%-%e%j%F%#(B
$BLdBj$KBP$7$F(B, $BFC$K2?$+$r<gD%$9$k$3$H$O$"$j$^$;$s(B ($BLuCm(B: Ports
Collection $B$KF~$C$F$$$k$+$i$H$$$C$F(B, FreeBSD $B$N3+H/<T$?$A$,$=$N%"%W%j(B
$B%1!<%7%g%s$,0BA4$G$"$k$HI>2A$7$?$o$1$G$O$"$j$^$;$s(B). $B$?$@$7(B, $B%;%-%e%j(B
$B%F%#LdBj$KBP$7$FBg$-$J1F6A$r;}$D$h$&$J(B ports $B$KBP$9$k%;%-%e%j%F%#4F::(B
$B$rDs6!$9$Y$/(B, $B8=:_EXNOCf$G$9(B. 

III. $B1F6AHO0O(B - Impact

Local users can cause arbitrary commands to be executed as root.

$B%m!<%+%k$N%f!<%6$,(B root $B8"8B$GG$0U$N%3%^%s%I$r<B9T$9$k$3$H$,2DG=$G$9(B. 

If you have not chosen to install the apsfilter port/package, then
your system is not vulnerable to this problem.

apsfilter $B$N(B port/package $B$r%$%s%9%H!<%k$7$F$$$J$1$l$P(B, $B$=$N%7%9%F%`$K(B
$B$3$NLdBj$K$D$$$F$N%;%-%e%j%F%#>e$N<eE@$O$"$j$^$;$s(B.

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

Deinstall the apsfilter port/package, if you you have installed it.

apsfilter $B$N(B port/package $B$r%$%s%9%H!<%k$7$F$$$k>l9g(B, $B$=$l$r%"%s%$%s%9(B
$B%H!<%k$9$k(B.

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

One of the following:

$B0J2<$N$$$:$l$+$r9T$J$C$F$/$@$5$$(B.

1) Upgrade your entire ports collection and rebuild the apsfilter port.

1) Ports Collection $BA4BN$r99?7$7$F(B, apsfilter $B$N(B port $B$r:F%3%s%Q%$%k$9$k(B.

2) Deinstall the old package and install a new package dated after the
correction date, obtained from:

2) $B8E$$(B package $B$r%"%s%$%s%9%H!<%k$7(B, $B=$@5F|0J9_$N?7$7$$(B package $B$r%$(B
$B%s%9%H!<%k$9$k(B. $B?7$7$$%Q%C%1!<%8$O(B, $B0J2<$N>l=j$+$iF~<j2DG=$G$9(B. 

ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/print/apsfilter-5.4.2.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/print/apsfilter-5.4.2.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/print/apsfilter-5.4.2.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/print/apsfilter-5.4.2.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/print/apsfilter-5.4.2.tgz

3) download a new port skeleton for the apsfilter port from:

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

and use it to rebuild the port.

3) $B0J2<$N>l=j$+$i(B apsfilter $B$N?7$7$$(B port $B%9%1%k%H%s$r%@%&%s%m!<%I$7(B,
   $B$=$l$r;HMQ$7$F(B apsfilter $B$N(B port $B$r:F%3%s%Q%$%k$9$k(B.

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

4) Use the portcheckout utility to automate option (3) above. The
portcheckout port is available in /usr/ports/devel/portcheckout or the
package can be obtained from:

4) portcheckout $B%f!<%F%#%j%F%#$r;HMQ$9$k$H(B, $B>e5-(B (3) $B$r<+F0E*$K(B
   $B9T$J$&$3$H$,$G$-$^$9(B.  portcheckout $B$O(B,
   /usr/ports/devel/portcheckout $B$d(B, $B0J2<$N>l=j$+$iF~<j2DG=$G$9(B. 

ftp://ftp.freebsd.org/pub/FreeBSD/ports/packages/devel/portcheckout-1.0.tgz
END--------------------- $B$3$3$^$G(B ------------------------
----
$B$3$,$h$&$$$A$m$&(B
