6705d61482
Fix OpenSSL NULL pointer deference vulnerability. [SA-14:09] Add pkg bootstrapping, configuration and public keys. [EN-14:03] Improve build repeatability for kldxref(8). [EN-14:04] Fix data corruption with ciss(4). [EN-14:05]
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5.2 KiB
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140 lines
5.2 KiB
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=============================================================================
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FreeBSD-SA-14:10.openssl Security Advisory
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The FreeBSD Project
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Topic: OpenSSL NULL pointer deference vulnerability
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Category: contrib
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Module: openssl
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Announced: 2014-05-13
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Affects: FreeBSD 10.x.
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Corrected: 2014-05-13 23:19:16 UTC (stable/10, 10.0-STABLE)
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2014-05-13 23:22:28 UTC (releng/10.0, 10.0-RELEASE-p3)
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CVE Name: CVE-2014-0198
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit <URL:http://security.FreeBSD.org/>.
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I. Background
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FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is
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a collaborative effort to develop a robust, commercial-grade, full-featured
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Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3)
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and Transport Layer Security (TLS v1) protocols as well as a full-strength
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general purpose cryptography library.
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The TLS protocol supports an alert protocol which can be used to signal the
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other party with certain failures in the protocol context that may require
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immediate termination of the connection.
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II. Problem Description
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An attacker can trigger generation of an SSL alert which could cause a null
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pointer deference.
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III. Impact
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An attacker may be able to cause a service process that uses OpenSSL to crash,
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which can be used in a denial-of-service attack.
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IV. Workaround
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No workaround is available, but systems that do not use OpenSSL to implement
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the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1)
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protocols, or not using SSL_MODE_RELEASE_BUFFERS and use the same process
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to handle multiple SSL connections, are not vulnerable.
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The FreeBSD base system service daemons and utilities do not use the
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SSL_MODE_RELEASE_BUFFERS mode. However, many third party software uses this
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mode to reduce their memory footprint and may therefore be affected by this
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issue.
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V. Solution
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Perform one of the following:
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1) Upgrade your vulnerable system to a supported FreeBSD stable or
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release / security branch (releng) dated after the correction date.
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2) To update your vulnerable system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch http://security.FreeBSD.org/patches/SA-14:10/openssl.patch
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# fetch http://security.FreeBSD.org/patches/SA-14:10/openssl.patch.asc
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# gpg --verify openssl.patch.asc
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b) Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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Recompile the operating system using buildworld and installworld as
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described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>.
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Restart all deamons using the library, or reboot the system.
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3) To update your vulnerable system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/10/ r265986
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releng/10.0/ r265987
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:http://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:http://ftp.openbsd.org/pub/OpenBSD/patches/5.5/common/005_openssl.patch.sig>
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<URL:https://rt.openssl.org/Ticket/Display.html?user=guest&pass=guest&id=3321>
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<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0198>
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The latest revision of this advisory is available at
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<URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-14:10.openssl.asc>
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