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)
156 lines
6.7 KiB
Text
156 lines
6.7 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:14.bzip2 Security Advisory
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The FreeBSD Project
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Topic: bzip2 denial of service and permission race vulnerabilities
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Category: contrib
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Module: contrib_bzip2
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Announced: 2005-06-29
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Credits: Imran Ghory, Chris Evans
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Affects: All FreeBSD releases
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Corrected: 2005-06-29 21:38:48 UTC (RELENG_5, 5.4-STABLE)
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2005-06-29 21:41:03 UTC (RELENG_5_4, 5.4-RELEASE-p3)
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2005-06-29 21:42:33 UTC (RELENG_5_3, 5.3-RELEASE-p17)
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2005-06-29 21:43:42 UTC (RELENG_4, 4.11-STABLE)
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2005-06-29 21:45:14 UTC (RELENG_4_11, 4.11-RELEASE-p11)
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2005-06-29 21:46:15 UTC (RELENG_4_10, 4.10-RELEASE-p16)
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CVE Name: CAN-2005-0953, CAN-2005-1260
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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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bzip2 is a block-sorting file compression utility.
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II. Problem Description
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Two problems have been discovered relating to the extraction of
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bzip2-compressed files. First, a carefully constructed invalid bzip2
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archive can cause bzip2 to enter an infinite loop. Second, when
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creating a new file, bzip2 closes the file before setting its
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permissions.
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III. Impact
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The first problem can cause bzip2 to extract a bzip2 archive to an
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infinitely large file. If bzip2 is used in automated processing of
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untrusted files this could be exploited by an attacker to create an
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denial-of-service situation by exhausting disk space or by consuming
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all available cpu time.
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The second problem can allow a local attacker to change the
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permissions of local files owned by the user executing bzip2 providing
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that they have write access to the directory in which the file is
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being extracted.
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IV. Workaround
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Do not uncompress bzip2 archives from untrusted sources and do not
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uncompress files in directories where untrusted users have write
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access.
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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_4, RELENG_5_3, RELENG_4_11, or RELENG_4_10 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 4.10,
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4.11, 5.3, and 5.4 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 ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:14/bzip2.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:14/bzip2.patch.asc
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b) Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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# cd /usr/src/lib/libbz2
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# make obj && make depend && make && make install
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# cd /usr/src/usr.bin/bzip2
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# make obj && make depend && make && make install
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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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contrib/bzip2/bzip2.c 1.1.1.1.2.3
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contrib/bzip2/bzlib.c 1.1.1.1.2.3
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contrib/bzip2/compress.c 1.1.1.1.2.3
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contrib/bzip2/decompress.c 1.1.1.1.2.3
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contrib/bzip2/huffman.c 1.1.1.1.2.3
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.12
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src/sys/conf/newvers.sh 1.44.2.39.2.15
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contrib/bzip2/bzip2.c 1.1.1.1.2.2.12.1
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contrib/bzip2/bzlib.c 1.1.1.1.2.2.12.1
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contrib/bzip2/compress.c 1.1.1.1.2.2.12.1
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contrib/bzip2/decompress.c 1.1.1.1.2.2.12.1
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contrib/bzip2/huffman.c 1.1.1.1.2.2.12.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.17
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src/sys/conf/newvers.sh 1.44.2.34.2.18
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contrib/bzip2/bzip2.c 1.1.1.1.2.2.10.1
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contrib/bzip2/bzlib.c 1.1.1.1.2.2.10.1
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contrib/bzip2/compress.c 1.1.1.1.2.2.10.1
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contrib/bzip2/decompress.c 1.1.1.1.2.2.10.1
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contrib/bzip2/huffman.c 1.1.1.1.2.2.10.1
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RELENG_5
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contrib/bzip2/bzip2.c 1.1.1.2.8.1
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contrib/bzip2/bzlib.c 1.1.1.2.8.1
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contrib/bzip2/compress.c 1.1.1.2.8.1
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contrib/bzip2/decompress.c 1.1.1.2.8.1
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contrib/bzip2/huffman.c 1.1.1.2.8.1
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.12
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src/sys/conf/newvers.sh 1.62.2.18.2.8
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contrib/bzip2/bzip2.c 1.1.1.2.12.1
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contrib/bzip2/bzlib.c 1.1.1.2.12.1
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contrib/bzip2/compress.c 1.1.1.2.12.1
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contrib/bzip2/decompress.c 1.1.1.2.12.1
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contrib/bzip2/huffman.c 1.1.1.2.12.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.20
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src/sys/conf/newvers.sh 1.62.2.15.2.22
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contrib/bzip2/bzip2.c 1.1.1.2.10.1
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contrib/bzip2/bzlib.c 1.1.1.2.10.1
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contrib/bzip2/compress.c 1.1.1.2.10.1
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contrib/bzip2/decompress.c 1.1.1.2.10.1
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contrib/bzip2/huffman.c 1.1.1.2.10.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0953
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1260
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http://marc.theaimsgroup.com/?l=bugtraq&m=111229375217633
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http://scary.beasts.org/security/CESA-2005-002.txt
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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-05:14.bzip.asc
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