dcb9c59cc2
Fix bsnmpd remote denial of service vulnerability. [SA-14:01] Fix ntpd distributed reflection Denial of Service vulnerability. [SA-14:02] Fix OpenSSL multiple vulnerabilities. [SA-14:03] Fix BIND remote denial of service vulnerability. [SA-14:04] Disable hardware RNGs by default. [EN-14:01] Fix incorrect coalescing of stack entry with mmap. [EN-14:02]
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142 lines
5.3 KiB
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=============================================================================
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FreeBSD-EN-14:01.random Errata Notice
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The FreeBSD Project
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Topic: /dev/random should not make direct usage of hardware RNG
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Category: core
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Module: random
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Announced: 2014-01-14
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Affects: All versions of FreeBSD prior to 10.0-BETA1
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Corrected: 2014-01-14 19:27:42 UTC (stable/9, 9.2-STABLE)
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2014-01-14 19:42:28 UTC (releng/9.2, 9.2-RELEASE-p3)
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2014-01-14 19:42:28 UTC (releng/9.1, 9.1-RELEASE-p10)
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2014-01-14 19:27:42 UTC (stable/8, 8.4-STABLE)
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2014-01-14 19:42:28 UTC (releng/8.4, 8.4-RELEASE-p7)
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2014-01-14 19:42:28 UTC (releng/8.3, 8.3-RELEASE-p14)
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For general information regarding FreeBSD Errata Notices and Security
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Advisories, including descriptions of the fields above, security
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branches, and the following sections, please visit
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<URL:http://security.freebsd.org/>.
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I. Background
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The random(4) and urandom(4) devices return an endless supply of pseudo-random
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bytes when read. Cryptographic algorithms often depend on the secrecy of these
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pseudo-random values for security.
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Yarrow is a secure pseudo-random number generator that combines entropy from
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several entropy sources, mitigating a possible attack when someone could
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predict the output when they are able to intercept one or more of the
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entropy sources
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II. Problem Description
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When a hardware RNG exists, the FreeBSD random(4) and urandom(4) devices
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would use their output directly.
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III. Impact
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Someone who has control over these hardware RNGs would be able to
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predicate the output from random(4) and urandom(4) devices and may be able
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to reveal unique keys that are used to encrypt data.
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IV. Workaround
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Disable the hardware RNGs by adding the following settings to /boot/loader.conf
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and reboot the system:
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hw.nehemiah_rng_enable=0
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hw.ivy_rng_enable=0
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V. Solution
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Hardware RNGs would be disabled by default with this errata notice. They
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can be re-enabled by setting the corresponding loader tunables to non-zero
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value.
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Perform one of the following:
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1) Upgrade your system to a supported FreeBSD stable or release / security
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branch (releng) dated after the correction date.
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2) To update your present 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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[FreeBSD 9.2 and 8.4]
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# fetch http://security.FreeBSD.org/patches/EN-14:01/random-9.2-8.4.patch
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# fetch http://security.FreeBSD.org/patches/EN-14:01/random-9.2-8.4.patch.asc
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# gpg --verify random-9.2-8.4.patch.asc
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[FreeBSD 9.1]
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# fetch http://security.FreeBSD.org/patches/EN-14:01/random-9.1.patch
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# fetch http://security.FreeBSD.org/patches/EN-14:01/random-9.1.patch.asc
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# gpg --verify random-9.1.patch.asc
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[FreeBSD 8.3]
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# fetch http://security.FreeBSD.org/patches/EN-14:01/random-8.3.patch
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# fetch http://security.FreeBSD.org/patches/EN-14:01/random-8.3.patch.asc
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# gpg --verify random-8.3.patch.asc
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b) Apply the patch.
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile your kernel as described in
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<URL:http://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
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system.
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3) To update your 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 revision numbers of each file that was
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corrected in FreeBSD.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/8/ r260644
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releng/8.3/ r260647
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releng/8.4/ r260647
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stable/9/ r260644
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releng/9.1/ r260647
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releng/9.2/ r260647
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- -------------------------------------------------------------------------
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VII. References
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The latest revision of this Errata Notice is available at
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http://security.FreeBSD.org/advisories/FreeBSD-EN-14:01.random.asc
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=viar
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