-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-09:17.freebsd-update Security Advisory The FreeBSD Project Topic: Inappropriate directory permissions in freebsd-update(8) Category: core Module: usr.sbin Announced: 2009-12-03 Credits: KAMADA Ken'ichi Affects: All supported versions of FreeBSD. Corrected: 2009-12-03 09:18:40 UTC (RELENG_8, 8.0-STABLE) 2009-12-03 09:18:40 UTC (RELENG_8_0, 8.0-RELEASE-p1) 2009-12-03 09:18:40 UTC (RELENG_7, 7.2-STABLE) 2009-12-03 09:18:40 UTC (RELENG_7_2, 7.2-RELEASE-p5) 2009-12-03 09:18:40 UTC (RELENG_7_1, 7.1-RELEASE-p9) 2009-12-03 09:18:40 UTC (RELENG_6, 6.4-STABLE) 2009-12-03 09:18:40 UTC (RELENG_6_4, 6.4-RELEASE-p8) 2009-12-03 09:18:40 UTC (RELENG_6_3, 6.3-RELEASE-p14) For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background The freebsd-update(8) utility is used to fetch, install, and rollback updates to the FreeBSD base system, and also to upgrade from one FreeBSD release to another. II. Problem Description When downloading updates to FreeBSD via 'freebsd-update fetch' or 'freebsd-update upgrade', the freebsd-update(8) utility copies currently installed files into its working directory (/var/db/freebsd-update by default) both for the purpose of merging changes to configuration files and in order to be able to roll back installed updates. The default working directory used by freebsd-update(8) is normally created during the installation of FreeBSD with permissions which allow all local users to see its contents, and freebsd-update(8) does not take any steps to restrict access to files stored in said directory. III. Impact A local user can read files which have been updated by freebsd-update(8), even if those files have permissions which would normally not allow users to read them. In particular, on systems which have been upgraded using 'freebsd-update upgrade', local users can read freebsd-update's backed-up copy of the master password file. IV. Workaround Set the permissions on the freebsd-update(8) working directory to not allow unprivileged users to read said directory: # chmod 0700 /var/db/freebsd-update Note that if freebsd-update(8) is run using the '-d workdir' option, the directory which should have its permissions adjusted will be different. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 6-STABLE, 7-STABLE or 8-STABLE, or to the RELENG_8_0, RELENG_7_2, RELENG_7_1, RELENG_6_4, or RELENG_6_3 security branch dated after the correction date. 2) To patch your present system: The following patch has been verified to apply to FreeBSD 6.3, 6.4, 7.1, 7.2, and 8.0 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch http://security.FreeBSD.org/patches/SA-09:17/freebsd-update.patch # fetch http://security.FreeBSD.org/patches/SA-09:17/freebsd-update.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch # cd /usr/src/usr.sbin/freebsd-update # make obj && make depend && make && make install # chmod 0700 /var/db/freebsd-update VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. CVS: Branch Revision Path - ------------------------------------------------------------------------- RELENG_6 src/usr.sbin/freebsd-update/freebsd-update.sh 1.2.2.11 src/etc/mtree/BSD.var.dist 1.71.2.4 RELENG_6_4 src/UPDATING 1.416.2.40.2.12 src/sys/conf/newvers.sh 1.69.2.18.2.14 src/usr.sbin/freebsd-update/freebsd-update.sh 1.2.2.10.2.2 src/etc/mtree/BSD.var.dist 1.71.2.3.6.2 RELENG_6_3 src/UPDATING 1.416.2.37.2.19 src/sys/conf/newvers.sh 1.69.2.15.2.18 src/usr.sbin/freebsd-update/freebsd-update.sh 1.2.2.8.2.1 src/etc/mtree/BSD.var.dist 1.71.2.3.4.1 RELENG_7 src/usr.sbin/freebsd-update/freebsd-update.sh 1.8.2.5 src/etc/mtree/BSD.var.dist 1.75.2.1 RELENG_7_2 src/UPDATING 1.507.2.23.2.8 src/sys/conf/newvers.sh 1.72.2.11.2.9 src/usr.sbin/freebsd-update/freebsd-update.sh 1.8.2.4.4.2 src/etc/mtree/BSD.var.dist 1.75.8.2 RELENG_7_1 src/UPDATING 1.507.2.13.2.12 src/sys/conf/newvers.sh 1.72.2.9.2.13 src/usr.sbin/freebsd-update/freebsd-update.sh 1.8.2.4.2.2 src/etc/mtree/BSD.var.dist 1.75.6.2 RELENG_8 src/usr.sbin/freebsd-update/freebsd-update.sh 1.16.2.3 src/etc/mtree/BSD.var.dist 1.75.10.2 RELENG_8_0 src/UPDATING 1.632.2.7.2.4 src/sys/conf/newvers.sh 1.83.2.6.2.4 src/usr.sbin/freebsd-update/freebsd-update.sh 1.16.2.2.2.2 src/etc/mtree/BSD.var.dist 1.75.10.1.2.2 - ------------------------------------------------------------------------- Subversion: Branch/path Revision - ------------------------------------------------------------------------- stable/6/ r200054 releng/6.4/ r200054 releng/6.3/ r200054 stable/7/ r200054 releng/7.2/ r200054 releng/7.1/ r200054 stable/8/ r200054 releng/8.0/ r200054 - ------------------------------------------------------------------------- VII. References The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-09:17.freebsd-update.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (FreeBSD) iEYEARECAAYFAksXhA0ACgkQFdaIBMps37Lg+wCfSK5sMXpsxTW9jpgwwcqx+24z zzwAniR50V8K8/vI0qshCUaKwryEYDuK =/lsC -----END PGP SIGNATURE-----