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FreeBSD Security Advisories

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Nov 15, 2017, 6:24:41 PM11/15/17

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=============================================================================
FreeBSD-SA-17:10.kldstat Security Advisory
The FreeBSD Project

Topic: Information leak in kldstat(2)

Category: core
Module: kernel
Announced: 2017-11-15
Credits: TJ Corley
Affects: All supported versions of FreeBSD.
Corrected: 2017-11-15 22:34:15 UTC (stable/11, 11.1-STABLE)
2017-11-15 22:49:47 UTC (releng/11.1, 11.1-RELEASE-p4)
2017-11-15 22:50:20 UTC (releng/11.0, 11.0-RELEASE-p15)
2017-11-15 22:35:16 UTC (stable/10, 10.4-STABLE)
2017-11-15 22:50:47 UTC (releng/10.4, 10.4-RELEASE-p3)
2017-11-15 22:51:08 UTC (releng/10.3, 10.3-RELEASE-p24)
CVE Name: CVE-2017-1088

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 kldstat(2) syscall provides information about loaded kld files. The
syscall takes a userland argument of struct kld_file_stat which is then
filled with data about the kld file requested.

II. Problem Description

The kernel does not properly clear the memory of the kld_file_stat
structure before filling the data. Since the structure filled by the
kernel is allocated on the kernel stack and copied to userspace, a leak
of information from the kernel stack is possible.

III. Impact

Some bytes from the kernel stack can be observed in userspace.

IV. Workaround

No workaround is available.

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.

Afterward, reboot the system.

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

Afterward, reboot the system.

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-17:10/kldstat.patch
# fetch https://security.FreeBSD.org/patches/SA-17:10/kldstat.patch.asc
# gpg --verify kldstat.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/ r325867
releng/10.3/ r325878
releng/10.4/ r325877
stable/11/ r325866
releng/11.0/ r325876
releng/11.1/ r325875
- -------------------------------------------------------------------------

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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1088>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-17:10.kldstat.asc>
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FreeBSD Security Advisories

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Nov 20, 2017, 11:04:05 PM11/20/17

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=============================================================================

FreeBSD-SA-17:08.ptrace Security Advisory
The FreeBSD Project

Topic: Kernel data leak via ptrace(PT_LWPINFO)

Category: core
Module: ptrace
Announced: 2017-11-15
Credits: Ilja van Sprundel
John Baldwin

Affects: All supported versions of FreeBSD.

Corrected: 2017-11-10 12:28:43 UTC (stable/11, 11.1-STABLE)
2017-11-15 22:39:41 UTC (releng/11.1, 11.1-RELEASE-p4)
2017-11-15 22:40:15 UTC (releng/11.0, 11.0-RELEASE-p15)
2017-11-10 12:31:58 UTC (stable/10, 10.4-STABLE)
2017-11-15 22:40:32 UTC (releng/10.4, 10.4-RELEASE-p3)
2017-11-15 22:40:46 UTC (releng/10.3, 10.3-RELEASE-p24)
CVE Name: CVE-2017-1086

0. Revision history

v1.0 2017-11-15 Initial release.
v1.1 2017-11-20 Corrected credit. Ilja van Sprundel first reported this
issue to the project, but wasn't cited. The FreeBSD
Security Team apologizes to Ilja for this oversight.

I. Background

The ptrace(2) syscall provides the facility for a debugger to control the
execution of the target process and to obtain necessary status information
about it. The struct ptrace_lwpinfo structure is reported by one of the
ptrace(2) subcommand and contains a lot of the information about the stopped
thread (light-weight process or LWP, thus the name).

II. Problem Description

Not all information in the struct ptrace_lwpinfo is relevant for the state
of any thread, and the kernel does not fill the irrelevant bytes or short
strings. Since the structure filled by the kernel is allocated on the
kernel stack and copied to userspace, a leak of information of the kernel
stack of the thread is possible from the debugger.

III. Impact

Some bytes from the kernel stack of the thread using ptrace(PT_LWPINFO)
call can be observed in userspace.

IV. Workaround

No workaround is available.

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.

Afterward, reboot the system.

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

Afterward, reboot the system.

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-17:08/ptrace.patch
# fetch https://security.FreeBSD.org/patches/SA-17:08/ptrace.patch.asc
# gpg --verify ptrace.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/ r325643
releng/10.3/ r325871
releng/10.4/ r325870
stable/11/ r325642
releng/11.0/ r325869
releng/11.1/ r325868

- -------------------------------------------------------------------------

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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1086>

The latest revision of this advisory is available at

<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-17:08.ptrace.asc>
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FreeBSD Security Advisories

unread,

Nov 20, 2017, 11:06:07 PM11/20/17

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================

FreeBSD-SA-17:10.kldstat Security Advisory
The FreeBSD Project

Topic: Information leak in kldstat(2)

Category: core
Module: kernel

Announced: 2017-11-15
Credits: Ilja van Sprundel

TJ Corley

Affects: All supported versions of FreeBSD.

Corrected: 2017-11-15 22:34:15 UTC (stable/11, 11.1-STABLE)
2017-11-15 22:49:47 UTC (releng/11.1, 11.1-RELEASE-p4)
2017-11-15 22:50:20 UTC (releng/11.0, 11.0-RELEASE-p15)

2017-11-15 22:35:16 UTC (stable/10, 10.4-STABLE)
2017-11-15 22:50:47 UTC (releng/10.4, 10.4-RELEASE-p3)
2017-11-15 22:51:08 UTC (releng/10.3, 10.3-RELEASE-p24)
CVE Name: CVE-2017-1088

v1.1 2017-11-20 Corrected credit. Ilja van Sprundel first reported the

issue to the project, but wasn't cited. The FreeBSD
Security Team apologizes to Ilja for this oversight.

I. Background

The kldstat(2) syscall provides information about loaded kld files. The
syscall takes a userland argument of struct kld_file_stat which is then
filled with data about the kld file requested.

II. Problem Description

The kernel does not properly clear the memory of the kld_file_stat

structure before filling the data. Since the structure filled by the

kernel is allocated on the kernel stack and copied to userspace, a leak

of information from the kernel stack is possible.

III. Impact

Some bytes from the kernel stack can be observed in userspace.

# fetch https://security.FreeBSD.org/patches/SA-17:10/kldstat.patch
# fetch https://security.FreeBSD.org/patches/SA-17:10/kldstat.patch.asc
# gpg --verify kldstat.patch.asc

stable/10/ r325867
releng/10.3/ r325878
releng/10.4/ r325877
stable/11/ r325866
releng/11.0/ r325876
releng/11.1/ r325875

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1088>

The latest revision of this advisory is available at

<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-17:10.kldstat.asc>
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FreeBSD Security Advisories

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Nov 29, 2017, 1:17:28 AM11/29/17

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Hash: SHA512

=============================================================================

FreeBSD-SA-17:11.openssl Security Advisory
The FreeBSD Project

Topic: OpenSSL multiple vulnerabilities

Category: contrib
Module: openssl
Announced: 2017-11-29

Affects: All supported versions of FreeBSD.

Corrected: 2017-11-02 18:30:41 UTC (stable/11, 11.1-STABLE)
2017-11-29 05:59:12 UTC (releng/11.1, 11.1-RELEASE-p5)
2017-11-29 05:59:12 UTC (releng/11.0, 11.0-RELEASE-p16)
2017-11-29 05:35:28 UTC (stable/10, 10.4-STABLE)
2017-11-29 05:59:50 UTC (releng/10.4, 10.4-RELEASE-p4)
2017-11-29 05:59:50 UTC (releng/10.3, 10.3-RELEASE-p25)
CVE Name: CVE-2017-3735, CVE-2017-3736

I. Background

FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is
a collaborative effort to develop a robust, commercial-grade, full-featured
Open Source toolkit for the Transport Layer Security (TLS) and Secure Sockets
Layer (SSL) protocols. It is also a full-strength general purpose
cryptography library.

II. Problem Description

If an X.509 certificate has a malformed IPAddressFamily extension, OpenSSL
could do a one-byte buffer overread. [CVE-2017-3735]

There is a carry propagating bug in the x86_64 Montgomery squaring procedure.
This only affects processors that support the BMI1, BMI2 and ADX extensions
like Intel Broadwell (5th generation) and later or AMD Ryzen. [CVE-2017-3736]
This bug only affects FreeBSD 11.x.

III. Impact

Application using OpenSSL may display erroneous certificate in text format.
[CVE-2017-3735]

Mishandling of carry propagation will produce incorrect output, and make it
easier for a remote attacker to obtain sensitive private-key information.
No EC algorithms are affected, analysis suggests that attacks against RSA
and DSA as a result of this defect would be very difficult to perform and
are not believed likely.

Attacks against DH are considered just feasible (although very difficult)
because most of the work necessary to deduce information about a private
key may be performed offline. The amount of resources required for such
an attack would be very significant and likely only accessible to a limited
number of attackers. An attacker would additionally need online access to
an unpatched system using the target private key in a scenario with
persistent DH parameters and a private key that is shared between multiple
clients. [CVE-2017-3736]

Restart all daemons that use the library, or reboot the system.

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

Restart all daemons that use the library, or reboot the system.

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.

[FreeBSD 10.3]
# fetch https://security.FreeBSD.org/patches/SA-17:11/openssl-10.patch
# fetch https://security.FreeBSD.org/patches/SA-17:11/openssl-10.patch.asc
# gpg --verify openssl-10.patch.asc

[FreeBSD 11.x]
# fetch https://security.FreeBSD.org/patches/SA-17:11/openssl.patch
# fetch https://security.FreeBSD.org/patches/SA-17:11/openssl.patch.asc
# gpg --verify openssl.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/ r326357
releng/10.3/ r326359
releng/10.4/ r326359
stable/11/ r325337
releng/11.0/ r326358
releng/11.1/ r326358

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3735>

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3736>

<URL:https://www.openssl.org/news/secadv/20171102.txt>

The latest revision of this advisory is available at

<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-17:11.openssl.asc>
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FreeBSD Security Advisories

unread,

Dec 8, 2017, 11:46:39 PM12/8/17

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================

FreeBSD-SA-17:12.openssl Security Advisory

The FreeBSD Project

Topic: OpenSSL multiple vulnerabilities

Category: contrib
Module: openssl

Announced: 2017-12-09

Affects: All supported versions of FreeBSD.

Corrected: 2017-12-07 18:04:48 UTC (stable/11, 11.1-STABLE)
2017-12-09 03:44:26 UTC (releng/11.1, 11.1-RELEASE-p6)
2017-12-09 03:41:31 UTC (stable/10, 10.4-STABLE)
2017-12-09 03:45:23 UTC (releng/10.4, 10.4-RELEASE-p5)
2017-12-09 03:45:23 UTC (releng/10.3, 10.3-RELEASE-p26)
CVE Name: CVE-2017-3737, CVE-2017-3738

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

FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is
a collaborative effort to develop a robust, commercial-grade, full-featured
Open Source toolkit for the Transport Layer Security (TLS) and Secure Sockets
Layer (SSL) protocols. It is also a full-strength general purpose
cryptography library.

II. Problem Description

Invoking SSL_read()/SSL_write() while in an error state causes data to be
passed without being decrypted/encrypted directly from the SSL/TLS record
layer.

In order to exploit this issue an application bug would have to be present
that resulted in a call to SSL_read()/SSL_write() being issued after having
already received a fatal error. [CVE-2017-3737]

There is an overflow bug in the x86_64 Montgomery multiplication procedure
used in exponentiation with 1024-bit moduli. This only affects processors
that support the AVX2 but not ADX extensions like Intel Haswell (4th
generation). [CVE-2017-3738] This bug only affects FreeBSD 11.x.

III. Impact

Applications with incorrect error handling may inappropriately pass
unencrypted data. [CVE-2017-3737]

Mishandling of carry propagation will produce incorrect output, and make it
easier for a remote attacker to obtain sensitive private-key information. No

EC algorithms are affected and analysis suggests that attacks against RSA and

DSA as a result of this defect would be very difficult to perform and are not
believed likely.

Attacks against DH1024 are considered just feasible (although very difficult)

because most of the work necessary to deduce information about a private key
may be performed offline. The amount of resources required for such an
attack would be very significant and likely only accessible to a limited

number of attackers. However, for an attack on TLS to be meaningful, the
server would have to share the DH1024 private key among multiple clients,
which is no longer an option since CVE-2016-0701. [CVE-2017-3738]

IV. Workaround

No workaround is available.

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.

Restart all daemons that use the library, or reboot the system.

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

Restart all daemons that use the library, or reboot the system.

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.

[FreeBSD 10.x]
# fetch https://security.FreeBSD.org/patches/SA-17:12/openssl-10.patch
# fetch https://security.FreeBSD.org/patches/SA-17:12/openssl-10.patch.asc

# gpg --verify openssl-10.patch.asc

[FreeBSD 11.x]

# fetch https://security.FreeBSD.org/patches/SA-17:12/openssl-11.patch
# fetch https://security.FreeBSD.org/patches/SA-17:12/openssl-11.patch.asc
# gpg --verify openssl-11.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/ r326721
releng/10.3/ r326723
releng/10.4/ r326723
stable/11/ r326663
releng/11.1/ r326722

<URL:https://www.openssl.org/news/secadv/20171207.txt>

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3737>

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3738>

The latest revision of this advisory is available at

<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-17:12.openssl.asc>
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