Date: Wed, 2 Nov 2016 10:21:46 +0200 From: Borys Bezukladov <borys.bezukladov@gmail.com> To: freebsd-security@freebsd.org Cc: FreeBSD Security Advisories <security-advisories@freebsd.org> Subject: Re: FreeBSD Security Advisory FreeBSD-SA-16:35.openssl Message-ID: <CAD9qB%2BNqowceTUbDOVY-K4Z=o3Eb6iwQO1DL=v0ZfaA9qmmcjg@mail.gmail.com> In-Reply-To: <20161102075541.3A3FF154E@freefall.freebsd.org> References: <20161102075541.3A3FF154E@freefall.freebsd.org>
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On Wed, Nov 2, 2016 at 9:55 AM, FreeBSD Security Advisories <security-advisories@freebsd.org> wrote: > -----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----- > _______________________________________________ > freebsd-security@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-security > To unsubscribe, send any mail to "freebsd-security-unsubscribe@freebsd.org" -- Borys Bezukladov Embedded Systems Developer cell:+38 063 837 40 51
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