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)
125 lines
4.7 KiB
Text
125 lines
4.7 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:07.ldt Security Advisory
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The FreeBSD Project
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Topic: Local kernel memory disclosure in i386_get_ldt
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Category: core
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Module: sys_i386
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Announced: 2005-05-06
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Credits: Christer Oberg
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Affects: All FreeBSD/i386 4.x releases since 4.7-RELEASE
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All FreeBSD/i386 5.x and FreeBSD/amd64 5.x releases
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prior to 5.4-RELEASE
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Corrected: 2005-05-06 02:40:19 UTC (RELENG_5, 5.4-STABLE)
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2005-05-06 02:40:49 UTC (RELENG_5_4, 5.4-RELEASE)
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2005-05-06 02:40:32 UTC (RELENG_5_3, 5.3-RELEASE-p12)
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2005-05-06 02:39:35 UTC (RELENG_4, 4.11-STABLE)
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2005-05-06 02:40:05 UTC (RELENG_4_11, 4.11-RELEASE-p6)
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2005-05-06 02:39:52 UTC (RELENG_4_10, 4.10-RELEASE-p11)
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CVE Name: CAN-2005-1400
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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
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<URL:http://www.freebsd.org/security/>.
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I. Background
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The i386_get_ldt(2) system call allows a process to request that a
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portion of its Local Descriptor Table be copied from the kernel into
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userland.
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II. Problem Description
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The i386_get_ldt(2) syscall performs insufficient validation of its
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input arguments. In particular, negative or very large values may
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allow inappropriate data to be copied from the kernel.
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III. Impact
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Kernel memory may be disclosed to the user process. Such memory might
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contain sensitive information, such as portions of the file cache or
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terminal buffers. This information might be directly useful, or it
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might be leveraged to obtain elevated privileges in some way. For
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example, a terminal buffer might include a user-entered password.
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IV. Workaround
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No workaround is known for i386 and amd64 systems; other platforms are
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not affected by this 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 4-STABLE or 5-STABLE, or to the
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RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch dated after
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the 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 4.10,
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4.11, and 5.3 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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[FreeBSD 4.x]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt4.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt4.patch.asc
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[FreeBSD 5.x]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt5.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt5.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_4
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src/sys/i386/i386/sys_machdep.c 1.47.2.4
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.7
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src/sys/conf/newvers.sh 1.44.2.39.2.10
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src/sys/i386/i386/sys_machdep.c 1.47.2.3.8.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.12
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src/sys/conf/newvers.sh 1.44.2.34.2.13
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src/sys/i386/i386/sys_machdep.c 1.47.2.3.6.1
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RELENG_5
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src/sys/i386/i386/sys_machdep.c 1.92.2.3
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.6
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src/sys/i386/i386/sys_machdep.c 1.92.2.1.2.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.15
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src/sys/conf/newvers.sh 1.62.2.15.2.17
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src/sys/i386/i386/sys_machdep.c 1.92.4.1
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- -------------------------------------------------------------------------
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The latest revision of this advisory is available at
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ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:07.ldt.asc
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