FreeBSD Security Advisories
2016-Oct-10 07:52 UTC
[FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-16:31.libarchive
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============================================================================FreeBSD-SA-16:31.libarchive
Security Advisory
The FreeBSD Project
Topic: Multiple libarchive vulnerabilities
Category: core
Module: portsnap
Announced: 2016-10-05
Affects: All supported versions of FreeBSD.
Corrected: 2016-09-25 22:02:27 UTC (stable/11, 11.0-STABLE)
2016-09-27 19:36:12 UTC (releng/11.0, 11.0-RELEASE-p1)
2016-09-25 22:04:02 UTC (stable/10, 10.3-STABLE)
2016-10-10 07:18:54 UTC (releng/10.3, 10.3-RELEASE-p10)
2016-10-10 07:18:54 UTC (releng/10.2, 10.2-RELEASE-p23)
2016-10-10 07:18:54 UTC (releng/10.1, 10.1-RELEASE-p40)
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.
I. Background
The libarchive(3) library provides a flexible interface for reading and
writing streaming archive files such as tar(1) and cpio(1), and has been the
basis for the FreeBSD implementation of the tar(1) and cpio(1) utilities
since FreeBSD 5.3.
II. Problem Description
Flaws in libarchive's handling of symlinks and hard links allow overwriting
files outside the extraction directory, or permission changes to a directory
outside the extraction directory.
III. Impact
An attacker who can control freebsd-update's or portsnap's input to tar
can
change file content or permisssions on files outside of the update tool's
working sandbox.
IV. Workaround
No workaround is available.
V. Solution
Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.
No reboot is needed.
Perform one of the following:
1) To update your vulnerable system via a binary patch:
Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility.
This advisory is released concurrently with FreeBSD-SA-16:29.bspatch
which contains special instructions for using freebsd-update. Following
the instructions in that advisory will safely apply updates for
FreeBSD-SA-16:29.bspatch, FreeBSD-SA-16:30.portsnap, and
FreeBSD-SA-16:31.libarchive.
2) To update your vulnerable system via a source code patch:
The following patches have been verified to apply to the applicable
FreeBSD release branches.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch https://security.FreeBSD.org/patches/SA-16:31/libarchive.patch
# fetch https://security.FreeBSD.org/patches/SA-16:31/libarchive.patch.asc
# gpg --verify libarchive.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
VI. Correction details
The following list contains the correction revision numbers for each
affected branch.
Branch/path Revision
- -------------------------------------------------------------------------
stable/10/ r306322
releng/10.1/ r306941
releng/10.2/ r306941
releng/10.3/ r306941
stable/11/ r306321
releng/11.0/ r306379
- -------------------------------------------------------------------------
To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:
# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
Or visit the following URL, replacing NNNNNN with the revision number:
<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
VII. References
<URL:https://gist.github.com/anonymous/e48209b03f1dd9625a992717e7b89c4f>
<URL:https://github.com/libarchive/libarchive/issues/743>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-16:31.libarchive.asc>
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Alexander Hamann
2016-Oct-10 09:32 UTC
[FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-16:31.libarchive
Hi Security Team, The links to libarchive.patch and libarchive.patch.asc are broken. Looking at https://www.freebsd.org/security/patches/SA-16:31/ suggests that they should be versioned. Thanks, Alexander On Mon, Oct 10, 2016 at 9:52 AM, FreeBSD Security Advisories < security-advisories at freebsd.org> wrote:> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA512 > > ===========================================================> ================> FreeBSD-SA-16:31.libarchive Security > Advisory > The FreeBSD > Project > > Topic: Multiple libarchive vulnerabilities > > Category: core > Module: portsnap > Announced: 2016-10-05 > Affects: All supported versions of FreeBSD. > Corrected: 2016-09-25 22:02:27 UTC (stable/11, 11.0-STABLE) > 2016-09-27 19:36:12 UTC (releng/11.0, 11.0-RELEASE-p1) > 2016-09-25 22:04:02 UTC (stable/10, 10.3-STABLE) > 2016-10-10 07:18:54 UTC (releng/10.3, 10.3-RELEASE-p10) > 2016-10-10 07:18:54 UTC (releng/10.2, 10.2-RELEASE-p23) > 2016-10-10 07:18:54 UTC (releng/10.1, 10.1-RELEASE-p40) > > For general information regarding FreeBSD Security Advisories, > including descriptions of the fields above, security branches, and the > following sections, please visit <URL:https://security.FreeBSD.org/>. > > I. Background > > The libarchive(3) library provides a flexible interface for reading and > writing streaming archive files such as tar(1) and cpio(1), and has been > the > basis for the FreeBSD implementation of the tar(1) and cpio(1) utilities > since FreeBSD 5.3. > > II. Problem Description > > Flaws in libarchive's handling of symlinks and hard links allow overwriting > files outside the extraction directory, or permission changes to a > directory > outside the extraction directory. > > III. Impact > > An attacker who can control freebsd-update's or portsnap's input to tar can > change file content or permisssions on files outside of the update tool's > working sandbox. > > IV. Workaround > > No workaround is available. > > V. Solution > > Upgrade your vulnerable system to a supported FreeBSD stable or > release / security branch (releng) dated after the correction date. > > No reboot is needed. > > Perform one of the following: > > 1) To update your vulnerable system via a binary patch: > > Systems running a RELEASE version of FreeBSD on the i386 or amd64 > platforms can be updated via the freebsd-update(8) utility. > > This advisory is released concurrently with FreeBSD-SA-16:29.bspatch > which contains special instructions for using freebsd-update. Following > the instructions in that advisory will safely apply updates for > FreeBSD-SA-16:29.bspatch, FreeBSD-SA-16:30.portsnap, and > FreeBSD-SA-16:31.libarchive. > > 2) To update your vulnerable system via a source code patch: > > The following patches have been verified to apply to the applicable > FreeBSD release branches. > > a) Download the relevant patch from the location below, and verify the > detached PGP signature using your PGP utility. > > # fetch https://security.FreeBSD.org/patches/SA-16:31/libarchive.patch > # fetch https://security.FreeBSD.org/patches/SA-16:31/libarchive.patch.asc > # gpg --verify libarchive.patch.asc > > b) Apply the patch. Execute the following commands as root: > > # cd /usr/src > # patch < /path/to/patch > > c) Recompile the operating system using buildworld and installworld as > described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>. > > VI. Correction details > > The following list contains the correction revision numbers for each > affected branch. > > Branch/path Revision > - ------------------------------------------------------------ > ------------- > stable/10/ r306322 > releng/10.1/ r306941 > releng/10.2/ r306941 > releng/10.3/ r306941 > stable/11/ r306321 > releng/11.0/ r306379 > - ------------------------------------------------------------ > ------------- > > To see which files were modified by a particular revision, run the > following command, replacing NNNNNN with the revision number, on a > machine with Subversion installed: > > # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base > > Or visit the following URL, replacing NNNNNN with the revision number: > > <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> > > VII. References > > <URL:https://gist.github.com/anonymous/e48209b03f1dd9625a992717e7b89c4f> > <URL:https://github.com/libarchive/libarchive/issues/743> > > The latest revision of this advisory is available at > <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-16:3 > 1.libarchive.asc> > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.1.13 (FreeBSD) > > iQIcBAEBCgAGBQJX+0OrAAoJEO1n7NZdz2rnkaAP/i5Njok8Lg3ogwRGVo/HVQfA > AzRz2oQ5oAuwZhmpkQ3CzHArRsaTGuKK5C1SNJpmEDuq5XM2u5Td2ph/R5ry0fwF > 7B58Ci+o7ngRWtJ/N8dYk3cXfg0sjPZKDO1otIyfh8HF3UAq5uB3/w/8UFOpqcxQ > guMKahd/r9PnfrD8GtS+t/2V+KHInNH0J4YD/+hoqcdZPzMKtlE5D5OjqOov9rVn > myQwAuN+w2buPj2gXSuubq5wTNFOvj8u06mVpRj+0X0VoybdN5cohuqSx7s4vlw+ > /qV7gT2993aijXp43dGGSUeuGl1ZbrKp233vntkIYrsjJzaw56YMHL3ushopGGhj > OfC/ilXmsUjrlHgCrWpMiTuN7cdWDXrpMnaf4c99yMxdYUuRtbbnVthdOpZB8iOt > 7xeVnvHiYTYbQu+4xy4SPOWqPLOnrbwVqIocXU1QjWJice5A3EU/mSAd2IpX04a2 > prdlaGxBNZlziLgzsZoiER+5u0S3owbx7y2SVhMEslHyrRQ92X7SZjfu4NrvlX5k > Dw6xjpHD51pshj4GXTPuznbCyd8246u1fRnH3fnlNLhz5/XhrYbG+OVQ9WDbnX2C > 6SzS/oOcjA9qcq1+Ghmz6G7S2MuWZ0XcKfzV0ygX2RZEhU1p0rZfsF/2cGrKIGY1 > JguXI1tZdrjfSZisAI+l > =vqSJ > -----END PGP SIGNATURE----- > _______________________________________________ > freebsd-announce at freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-announce > To unsubscribe, send any mail to "freebsd-announce-unsubscribe at freebsd.org > " >