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=============================================================================
FreeBSD-EN-17:06.hyperv Errata Notice
The FreeBSD Project
Topic: Boot compatibility improvements with Azure VMs
Category: core
Module: hyperv/storvsc
Announced: 2017-07-12
Credits: Microsoft OSTC
Affects: FreeBSD 10.3
Corrected: 2016-10-19 08:45:19 UTC (stable/10, 10.3-STABLE)
2017-07-12 08:07:55 UTC (releng/10.3, 10.3-RELEASE-p20)
For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.FreeBSD.org/>.
I. Background
Hyper-V is a default hypervisor provided on Windows server by Microsoft.
ATA driver is the legacy storage driver for FreeBSD on Hyperv, now they
are replaced by synthetic driver which has better performance.
There are issues when attaching multiple synthetic storage driver for
FreeBSD 10.3 on some of Hyper-V hosts.
CD/DVD cannot be detected in some circumstances which cause provisioning
fail on Azure.
II. Problem Description
The disk INQUIRY response is not complete for FreeBSD 10.3 on some
Hyper-V hosts, which will cause the disks will be detached during boot.
An interrupt is missing if we allow intr_shuffle_irqs on Hyper-V.
III. Impact
FreeBSD 10.3 can not be boot properly on a guest system on Hyper-V host.
IV. Workaround
No workaround is available.
V. Solution
Perform one of the following:
1) Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date.
A reboot is required.
2) To update your 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:
# freebsd-update fetch
# freebsd-update install
A reboot is required.
3) To update your 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/EN-17:06/hyperv.patch
# fetch https://security.FreeBSD.org/patches/EN-17:06/hyperv.patch.asc
# gpg --verify hyperv.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile your kernel as described in
<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
system.
VI. Correction details
The following list contains the correction revision numbers for each
affected branch.
Branch/path Revision
- -------------------------------------------------------------------------
stable/10/ r307623
releng/10.3/ r320912
- -------------------------------------------------------------------------
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://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212721>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-17:06.hyperv.asc>
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=============================================================================
FreeBSD-SA-17:05.heimdal Security Advisory
The FreeBSD Project
Topic: heimdal KDC-REP service name validation vulnerability
Category: contrib
Module: heimdal
Announced: 2017-07-12
Affects: All supported versions of FreeBSD.
Corrected: 2017-07-12 07:26:07 UTC (stable/11, 11.1-PRERELEASE)
2017-07-12 08:07:16 UTC (releng/11.1, 11.1-RC2-p1)
2017-07-12 08:07:16 UTC (releng/11.1, 11.1-RC1-p1)
2017-07-12 07:26:07 UTC (stable/11, 11.1-BETA3-p1)
2017-07-12 08:07:36 UTC (releng/11.0, 11.0-RELEASE-p11)
2017-07-12 07:26:07 UTC (stable/10, 10.3-STABLE)
2017-07-12 08:07:36 UTC (releng/10.3, 10.3-RELEASE-p20)
CVE Name: CVE-2017-11103
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
Heimdal implements the Kerberos 5 network authentication protocols.
The Kerberos protocol uses "ticket" to authenticate a client to a
service.
A Key Distribution Center (KDC) is trusted by all principals registered
in that administrative "realm" to store a secret key in confidence, of
which, the proof of knowledge is used to verify the authenticity of a
principal.
II. Problem Description
There is a programming error in Heimdal implementation that used an
unauthenticated, plain-text version of the KDC-REP service name found
in a ticket.
III. Impact
An attacker who has control to the network between a client and the
service it talks to will be able to impersonate the service, allowing
a successful man-in-the-middle (MITM) attack that circumvents the mutual
authentication.
IV. Workaround
No workaround is available, but only Kerberos enabled clients are
affected.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.
A reboot is recommended.
2) 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:
# freebsd-update fetch
# freebsd-update install
A reboot is recommended.
3) 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-17:05/heimdal.patch
# fetch https://security.FreeBSD.org/patches/SA-17:05/heimdal.patch.asc
# gpg --verify heimdal.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>.
Restart all daemons that use the library, or reboot the system.
VI. Correction details
The following list contains the correction revision numbers for each
affected branch.
Branch/path Revision
- -------------------------------------------------------------------------
stable/10/ r320907
releng/10.3/ r320912
stable/11/ r320907
releng/11.0/ r320911
releng/11.1/ r320910
- -------------------------------------------------------------------------
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://www.orpheus-lyre.info/>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11103>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-17:05.heimdal.asc>
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