148 lines
5.6 KiB
Text
148 lines
5.6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
|
|
Hash: SHA512
|
|
|
|
=============================================================================
|
|
FreeBSD-SA-16:35.openssl Security Advisory
|
|
The FreeBSD Project
|
|
|
|
Topic: OpenSSL Remote DoS vulnerability
|
|
|
|
Category: contrib
|
|
Module: openssl
|
|
Announced: 2016-11-02
|
|
Affects: FreeBSD 9.x and FreeBSD 10.x.
|
|
Corrected: 2016-11-02 07:09:31 UTC (stable/10, 10.3-STABLE)
|
|
2016-11-02 07:23:36 UTC (releng/10.3, 10.3-RELEASE-p12)
|
|
2016-11-02 07:24:14 UTC (releng/10.2, 10.2-RELEASE-p25)
|
|
2016-11-02 07:24:14 UTC (releng/10.1, 10.1-RELEASE-p42)
|
|
2016-11-02 07:09:31 UTC (stable/9, 9.3-STABLE)
|
|
2016-11-02 07:24:34 UTC (releng/9.3, 9.3-RELEASE-p50)
|
|
CVE Name: CVE-2016-8610
|
|
|
|
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 implementing the Secure Sockets Layer (SSL v2/v3)
|
|
and Transport Layer Security (TLS v1) protocols as well as a full-strength
|
|
general purpose cryptography library.
|
|
|
|
The SSL alert protocol is a way to communicate problems within a SSL/TLS session.
|
|
|
|
II. Problem Description
|
|
|
|
Due to improper handling of alert packets, OpenSSL would consume an excessive
|
|
amount of CPU time processing undefined alert messages.
|
|
|
|
III. Impact
|
|
|
|
A remote attacker who can initiate handshakes with an OpenSSL based server
|
|
can cause the server to consume a lot of computation power with very little
|
|
bandwidth usage, and may be able to use this technique in a leveraged Denial
|
|
of Service attack.
|
|
|
|
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-16:35/openssl-10.patch
|
|
# fetch https://security.FreeBSD.org/patches/SA-16:35/openssl-10.patch.asc
|
|
# gpg --verify openssl-10.patch.asc
|
|
|
|
[FreeBSD 9.3]
|
|
# fetch https://security.FreeBSD.org/patches/SA-16:35/openssl-9.patch
|
|
# fetch https://security.FreeBSD.org/patches/SA-16:35/openssl-9.patch.asc
|
|
# gpg --verify openssl-9.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/9/ r308200
|
|
releng/9.3/ r308205
|
|
stable/10/ r308200
|
|
releng/10.1/ r308204
|
|
releng/10.2/ r308204
|
|
releng/10.3/ r308203
|
|
- -------------------------------------------------------------------------
|
|
|
|
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:http://seclists.org/oss-sec/2016/q4/224>
|
|
|
|
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8610>
|
|
|
|
The latest revision of this advisory is available at
|
|
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-16:35.openssl.asc>
|
|
-----BEGIN PGP SIGNATURE-----
|
|
Version: GnuPG v2.1.15 (FreeBSD)
|
|
|
|
iQIcBAEBCgAGBQJYGZhkAAoJEO1n7NZdz2rnwbMQAOiGWegkYQodqBzNboK9U+6M
|
|
8Jt6HNrYDWAyzp+mZmWxgPWZMkGaNAsBEFXwZlHgs65RCbRczxr/kUWZx2/XHbM3
|
|
kGx5eNIq46BFIrTDPvUgNciorl/ncJGeO4SYEFBYImceDNwIQVtpfz1IUAve+LNW
|
|
RYYICakWn8HPuqzmIFjQydMkoyEaHMwsmkv3nVNVX46sVIQ1umZ3RZsKtlPOQqNs
|
|
sAa0HuOOQbeU2eJhhtcYcDEPNF7Do9WvSMnYrJQ/lE2SuatXq2tdbvZLV8ieiPoj
|
|
3AMf9p2yPpeqqO9yy19CayTSPmDiKMVQq8jikVomX5XkVqNKLrQoQfrvpwR0DWOW
|
|
fwIDjZ1H9IXoqjVVZwp5GLfHhAURNjbsszF4B1lXQHI1D/p4bXyOOrcuM1JxHXRK
|
|
UGvagbs30DWH+4Baph/UVOsFUhPU0sguPtpPa0XFxSIxB6qZJJGjdOh7el6aBYJu
|
|
VxQuw1wWQvJPm9CsIIZrX4WYBcwS8ro82wsfNWO+ZC0j5UbMwh2joFgrbEdWNM3f
|
|
MWVYuH5czzoJO85Nu7uGB+qa9GYqKkdwGRDnFshnvPhHHnpmGL/tLHM+Kqg7uDeu
|
|
8RsNaZ4PYChZh8YHVooOraDl0Nz0Ln/kok8GdsZUpNfuiXm3U9fLUCAFAdNUOlr6
|
|
PJuvkUEQRMlhG8tX3+11
|
|
=1gO7
|
|
-----END PGP SIGNATURE-----
|