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)
105 lines
3.8 KiB
Text
105 lines
3.8 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:03.amd64 Security Advisory
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The FreeBSD Project
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Topic: unprivileged hardware access on amd64
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Category: core
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Module: sys_amd64
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Announced: 2005-04-06
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Credits: Jari Kirma
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Affects: All FreeBSD/amd64 5.x releases prior to 5.4-RELEASE
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Corrected: 2005-04-06 01:05:51 UTC (RELENG_5, 5.4-STABLE)
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2005-04-06 01:06:15 UTC (RELENG_5_4, 5.4-RELEASE)
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2005-04-06 01:06:44 UTC (RELENG_5_3, 5.3-RELEASE-p8)
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CVE Name: CAN-2005-1036
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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 AMD64 architecture has two mechanisms for permitting processes to
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access hardware: Kernel code can access hardware directly by reason of
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its elevated privilege level, while user code can access a subset of
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hardware determined by a bitmap.
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II. Problem Description
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The bitmap which determines which hardware can be accessed by unprivileged
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processes was not initialized properly.
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III. Impact
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Unprivileged users on amd64 systems can gain direct access to some
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hardware, allowing for denial of service, disclosure of sensitive
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information, or possible privilege escalation.
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IV. Workaround
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No workaround is known for amd64 systems; other platforms are not
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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 5-STABLE or to the RELENG_5_3
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security branch dated after the correction date.
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2) To patch your present system:
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a) Download the patch from the location below, and verify the detached
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PGP signature using your PGP utility.
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:03/amd64.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:03/amd64.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/amd64/amd64/machdep.c 1.618.2.10
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src/sys/amd64/amd64/mp_machdep.c 1.242.2.8
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src/sys/amd64/include/tss.h 1.16.2.1
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.2
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src/sys/amd64/amd64/machdep.c 1.618.2.9.2.1
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src/sys/amd64/amd64/mp_machdep.c 1.242.2.7.2.1
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src/sys/amd64/include/tss.h 1.16.6.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.11
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src/sys/conf/newvers.sh 1.62.2.15.2.13
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src/sys/amd64/amd64/machdep.c 1.618.2.1.2.1
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src/sys/amd64/amd64/mp_machdep.c 1.242.2.2.2.1
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src/sys/amd64/include/tss.h 1.16.4.1
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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-05:03.amd64.asc
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