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)
133 lines
5.2 KiB
Text
133 lines
5.2 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:02.sendfile Security Advisory
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The FreeBSD Project
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Topic: sendfile kernel memory disclosure
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Category: core
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Module: sys_kern
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Announced: 2005-04-04
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Credits: Sven Berkvens <sven@berkvens.net>
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Marc Olzheim <zlo@zlo.nu>
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Affects: All FreeBSD 4.x releases
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All FreeBSD 5.x releases prior to 5.4-RELEASE
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Corrected: 2005-04-04 23:52:02 UTC (RELENG_5, 5.4-STABLE)
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2005-04-04 23:52:35 UTC (RELENG_5_4, 5.4-RELEASE)
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2005-04-04 23:53:24 UTC (RELENG_5_3, 5.3-RELEASE-p7)
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2005-04-04 23:53:36 UTC (RELENG_4, 4.11-STABLE)
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2005-04-04 23:53:56 UTC (RELENG_4_11, 4.11-RELEASE-p2)
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2005-04-04 23:54:13 UTC (RELENG_4_10, 4.10-RELEASE-p7)
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2005-04-04 23:54:33 UTC (RELENG_4_8, 4.8-RELEASE-p29)
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CVE Name: CAN-2005-0708
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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 sendfile(2) system call allows a server application (such as an HTTP
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or FTP server) to transmit the contents of a file over a network
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connection without first copying it to application memory. High
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performance servers such as Apache and ftpd use sendfile.
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II. Problem Description
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If the file being transmitted is truncated after the transfer has
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started but before it completes, sendfile(2) will transfer the contents
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of more or less random portions of kernel memory in lieu of the
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missing part of the file.
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III. Impact
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A local user could create a large file and truncate it while
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transferring it to himself, thus obtaining a copy of portions of system
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memory to which he would normally not have access. 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 known workaround.
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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, RELENG_4_10, or RELENG_4_8 security branch
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dated after 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 4.8, 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-05:02/sendfile_4.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:02/sendfile_4.patch.asc
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[FreeBSD 5.3]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:02/sendfile_5.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:02/sendfile_5.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/ufs/ffs/ffs_inode.c 1.56.2.6
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.3
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src/sys/conf/newvers.sh 1.44.2.39.2.6
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src/sys/ufs/ffs/ffs_inode.c 1.56.2.5.12.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.8
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src/sys/conf/newvers.sh 1.44.2.34.2.8
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src/sys/ufs/ffs/ffs_inode.c 1.56.2.5.10.1
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RELENG_4_8
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src/UPDATING 1.73.2.80.2.33
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src/sys/conf/newvers.sh 1.44.2.29.2.29
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src/sys/ufs/ffs/ffs_inode.c 1.56.2.5.6.1
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RELENG_5
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src/sys/ufs/ffs/ffs_inode.c 1.93.2.2
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.1
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src/sys/ufs/ffs/ffs_inode.c 1.93.2.1.2.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.10
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src/sys/conf/newvers.sh 1.62.2.15.2.12
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src/sys/ufs/ffs/ffs_inode.c 1.93.4.1
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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/CERT/advisories/FreeBSD-SA-05:02.sendfile.asc
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-----END PGP SIGNATURE-----
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