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)
158 lines
6.4 KiB
Text
158 lines
6.4 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-11:04.compress Security Advisory
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The FreeBSD Project
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Topic: Errors handling corrupt compress file in compress(1)
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and gzip(1)
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Category: core
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Module: compress
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Announced: 2011-09-28
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Credits: Tomas Hoger, Joerg Sonnenberger
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Affects: All supported versions of FreeBSD.
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Corrected: 2011-09-28 08:47:17 UTC (RELENG_7, 7.4-STABLE)
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2011-09-28 08:47:17 UTC (RELENG_7_4, 7.4-RELEASE-p3)
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2011-09-28 08:47:17 UTC (RELENG_7_3, 7.3-RELEASE-p7)
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2011-09-28 08:47:17 UTC (RELENG_8, 8.2-STABLE)
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2011-09-28 08:47:17 UTC (RELENG_8_2, 8.2-RELEASE-p3)
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2011-09-28 08:47:17 UTC (RELENG_8_1, 8.1-RELEASE-p5)
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2011-09-28 08:47:17 UTC (RELENG_9, 9.0-RC1)
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CVE Name: CVE-2011-2895
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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 <URL:http://security.FreeBSD.org/>.
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I. Background
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The compress utility reduces the size of files using adaptive Lempel-Ziv
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coding, or LZW coding, a lossless data compression algorithm.
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Both compress(1) and gzip(1) uses code derived from 4.3BSD compress(1).
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II. Problem Description
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The code used to decompress a file created by compress(1) does not do
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sufficient boundary checks on compressed code words, allowing reference
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beyond the decompression table, which may result in a stack overflow or
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an infinite loop when the decompressor encounters a corrupted file.
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III. Impact
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An attacker who can cause a corrupt archive of his choice to be parsed
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by uncompress(1) or gunzip(1), can cause these utilities to enter an
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infinite loop, to core dump, or possibly to execute arbitrary code
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provided by the attacker.
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IV. Workaround
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No workaround is available, but systems not handling adaptive Lempel-Ziv
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compressed files (.Z) from untrusted source are not vulnerable.
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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 7-STABLE or 8-STABLE, or to
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the RELENG_8_2, RELENG_8_1, RELENG_7_4, or RELENG_7_3 security
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branch dated after the correction date.
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2) To update your vulnerable system via a source code patch:
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The following patches have been verified to apply to FreeBSD 7.4, 7.3,
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8.2 and 8.1 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 http://security.FreeBSD.org/patches/SA-11:04/compress.patch
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# fetch http://security.FreeBSD.org/patches/SA-11:04/compress.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/usr.bin/compress
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# make obj && make depend && make && make install
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# cd /usr/src/usr.bin/gzip
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# make obj && make depend && make && make install
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3) To update your vulnerable system via a binary patch:
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Systems running 7.4-RELEASE, 7.3-RELEASE, 8.2-RELEASE, or 8.1-RELEASE on
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the i386 or amd64 platforms can be updated via the freebsd-update(8)
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utility:
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# freebsd-update fetch
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# freebsd-update 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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CVS:
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Branch Revision
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Path
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- -------------------------------------------------------------------------
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RELENG_7
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src/usr.bin/compress/zopen.c 1.12.10.1
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src/usr.bin/gzip/zuncompress.c 1.1.4.3
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RELENG_7_4
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src/UPDATING 1.507.2.36.2.5
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src/sys/conf/newvers.sh 1.72.2.18.2.8
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src/usr.bin/compress/zopen.c 1.12.26.2
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src/usr.bin/gzip/zuncompress.c 1.1.4.1.4.2
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RELENG_7_3
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src/UPDATING 1.507.2.34.2.9
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src/sys/conf/newvers.sh 1.72.2.16.2.11
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src/usr.bin/compress/zopen.c 1.12.24.2
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src/usr.bin/gzip/zuncompress.c 1.1.4.1.2.2
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RELENG_8
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src/usr.bin/compress/zopen.c 1.12.22.2
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src/usr.bin/gzip/zuncompress.c 1.2.2.3
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RELENG_8_2
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src/UPDATING 1.632.2.19.2.5
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src/sys/conf/newvers.sh 1.83.2.12.2.8
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src/usr.bin/compress/zopen.c 1.12.22.1.6.2
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src/usr.bin/gzip/zuncompress.c 1.2.2.1.6.2
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RELENG_8_1
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src/UPDATING 1.632.2.14.2.8
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src/sys/conf/newvers.sh 1.83.2.10.2.9
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src/usr.bin/compress/zopen.c 1.12.22.1.4.2
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src/usr.bin/gzip/zuncompress.c 1.2.2.1.4.2
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RELENG_9
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src/usr.bin/compress/zopen.c 1.16.2.2
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src/usr.bin/gzip/zuncompress.c 1.4.2.2
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- -------------------------------------------------------------------------
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Subversion:
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/7/ r225827
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releng/7.4/ r225827
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releng/7.3/ r225827
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stable/8/ r225827
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releng/8.2/ r225827
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releng/8.1/ r225827
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stable/9/ r225827
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-2895
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-11:04.compress.asc
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=I+0k
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-----END PGP SIGNATURE-----
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