exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

FreeBSD Security Advisory - freebsd-update

FreeBSD Security Advisory - freebsd-update
Posted Dec 3, 2009
Site security.freebsd.org

FreeBSD Security Advisory - 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.

tags | advisory, local
systems | freebsd
SHA-256 | ded36262fd7c099273370d8e7b7df7dcd74a6ee0b857538117b791ae99da12b6

FreeBSD Security Advisory - freebsd-update

Change Mirror Download
-----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 <URL:http://security.FreeBSD.org/>.

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-----
Login or Register to add favorites

File Archive:

September 2022

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Sep 1st
    23 Files
  • 2
    Sep 2nd
    12 Files
  • 3
    Sep 3rd
    0 Files
  • 4
    Sep 4th
    0 Files
  • 5
    Sep 5th
    10 Files
  • 6
    Sep 6th
    8 Files
  • 7
    Sep 7th
    30 Files
  • 8
    Sep 8th
    14 Files
  • 9
    Sep 9th
    26 Files
  • 10
    Sep 10th
    0 Files
  • 11
    Sep 11th
    0 Files
  • 12
    Sep 12th
    5 Files
  • 13
    Sep 13th
    28 Files
  • 14
    Sep 14th
    15 Files
  • 15
    Sep 15th
    17 Files
  • 16
    Sep 16th
    9 Files
  • 17
    Sep 17th
    0 Files
  • 18
    Sep 18th
    0 Files
  • 19
    Sep 19th
    12 Files
  • 20
    Sep 20th
    15 Files
  • 21
    Sep 21st
    20 Files
  • 22
    Sep 22nd
    13 Files
  • 23
    Sep 23rd
    12 Files
  • 24
    Sep 24th
    0 Files
  • 25
    Sep 25th
    0 Files
  • 26
    Sep 26th
    30 Files
  • 27
    Sep 27th
    27 Files
  • 28
    Sep 28th
    8 Files
  • 29
    Sep 29th
    14 Files
  • 30
    Sep 30th
    19 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Hosting By
Rokasec
close