3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
122 lines
4.5 KiB
Text
122 lines
4.5 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-07:09.random Security Advisory
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The FreeBSD Project
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Topic: Random value disclosure
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Category: core
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Module: sys_dev_random
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Announced: 2007-11-29
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Credits: Robert Woolley
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Affects: All supported versions of FreeBSD
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Corrected: 2007-11-29 16:05:38 UTC (RELENG_7, 7.0-BETA4)
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2007-11-29 16:06:12 UTC (RELENG_6, 6.3-PRERELEASE)
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2007-11-29 16:06:54 UTC (RELENG_6_3, 6.3-RC2)
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2007-11-29 16:07:30 UTC (RELENG_6_2, 6.2-RELEASE-p9)
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2007-11-29 16:07:54 UTC (RELENG_6_1, 6.1-RELEASE-p21)
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2007-11-29 16:08:54 UTC (RELENG_5, 5.5-STABLE)
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2007-11-29 16:09:26 UTC (RELENG_5_5, 5.5-RELEASE-p17)
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CVE Name: CVE-2007-6150
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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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The random(4) and urandom(4) devices return an endless supply of
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pseudo-random bytes when read. Cryptographic algorithms often depend
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on the secrecy of these pseudo-random values for security.
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II. Problem Description
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Under certain circumstances, a bug in the internal state tracking on
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the random(4) and urandom(4) devices can be exploited to allow replaying
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of data distributed during subsequent reads.
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III. Impact
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This could enable an adversary to determine fragments of random values
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previously read, allowing them to defeat certain security mechanisms.
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Note that the attacker has to be in close proximity to the source of
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the pseudo-randomness, which typically means local access to the system.
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IV. Workaround
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No workaround is available.
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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 5-STABLE, or 6-STABLE, or to the
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RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the
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correction date.
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2) To patch your present system:
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The following patches have been verified to apply to FreeBSD 5.5, 6.1,
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and 6.2 systems.
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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-07:09/random.patch
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# fetch http://security.FreeBSD.org/patches/SA-07:09/random.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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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 Revision
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Path
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- -------------------------------------------------------------------------
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RELENG_5
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src/sys/dev/random/yarrow.c 1.44.2.1
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RELENG_5_5
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src/UPDATING 1.342.2.35.2.17
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src/sys/conf/newvers.sh 1.62.2.21.2.19
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src/sys/dev/random/yarrow.c 1.44.8.1
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RELENG_6
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src/sys/dev/random/yarrow.c 1.45.2.2
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RELENG_6_3
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src/UPDATING 1.416.2.37.2.2
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src/sys/dev/random/yarrow.c 1.45.2.1.6.1
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RELENG_6_2
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src/UPDATING 1.416.2.29.2.12
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src/sys/conf/newvers.sh 1.69.2.13.2.12
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src/sys/dev/random/yarrow.c 1.45.2.1.4.1
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RELENG_6_1
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src/UPDATING 1.416.2.22.2.23
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src/sys/conf/newvers.sh 1.69.2.11.2.23
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src/sys/dev/random/yarrow.c 1.45.2.1.2.1
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RELENG_7
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src/sys/dev/random/yarrow.c 1.47.2.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6150
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-07:09.random.asc
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