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)
124 lines
4.6 KiB
Text
124 lines
4.6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:04.ifconf Security Advisory
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The FreeBSD Project
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Topic: Kernel memory disclosure in ifconf()
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Category: core
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Module: sys_net
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Announced: 2005-04-15
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Credits: Ilja van Sprundel
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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: 2005-04-15 01:51:44 UTC (RELENG_5, 5.4-STABLE)
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2005-04-15 01:52:03 UTC (RELENG_5_4, 5.4-RELEASE)
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2005-04-15 01:52:25 UTC (RELENG_5_3, 5.3-RELEASE-p9)
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2005-04-15 01:52:40 UTC (RELENG_4, 4.11-STABLE)
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2005-04-15 01:52:57 UTC (RELENG_4_11, 4.11-RELEASE-p3)
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2005-04-15 01:53:14 UTC (RELENG_4_10, 4.10-RELEASE-p8)
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CVE Name: CAN-2005-1126
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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 SIOCGIFCONF ioctl allows a user process to ask the kernel to produce
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a list of the existing network interfaces and copy it into a buffer
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provided by the user process.
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II. Problem Description
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In generating the list of network interfaces, the kernel writes into a
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portion of a buffer without first zeroing it. As a result, the prior
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contents of the buffer will be disclosed to the calling process.
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III. Impact
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Up to 12 bytes of kernel memory may be disclosed to the user process.
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Such memory might contain sensitive information, such as portions of
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the file cache or terminal buffers. This information might be directly
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useful, or it might be leveraged to obtain elevated privileges in some
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way. For example, a terminal buffer might include a user-entered
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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, or RELENG_4_10 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 4.10, 4.11,
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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-05:04/ifconf4.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:04/ifconf4.patch.asc
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[FreeBSD 5.3]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:04/ifconf5.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:04/ifconf5.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/net/if.c 1.85.2.29
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.4
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src/sys/conf/newvers.sh 1.44.2.39.2.7
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src/sys/net/if.c 1.85.2.28.2.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.9
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src/sys/conf/newvers.sh 1.44.2.34.2.10
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src/sys/net/if.c 1.85.2.25.2.1
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RELENG_5
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src/sys/net/if.c 1.199.2.15
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.3
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src/sys/net/if.c 1.199.2.14.2.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.12
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src/sys/conf/newvers.sh 1.62.2.15.2.14
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src/sys/net/if.c 1.199.2.7.2.3
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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-05:04.ifconf.asc
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