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)
132 lines
4.9 KiB
Text
132 lines
4.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:11.gzip Security Advisory
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The FreeBSD Project
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Topic: gzip directory traversal and permission race vulnerabilities
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Category: contrib
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Module: gzip
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Announced: 2005-06-09
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Credits: Ulf Harnhammar, Imran Ghory
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Affects: All FreeBSD releases
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Corrected: 2005-06-08 21:26:27 UTC (RELENG_5, 5.4-STABLE)
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2005-06-08 21:27:44 UTC (RELENG_5_4, 5.4-RELEASE-p2)
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2005-06-08 21:29:15 UTC (RELENG_5_3, 5.3-RELEASE-p16)
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2005-06-08 21:29:53 UTC (RELENG_4, 4.11-STABLE)
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2005-06-08 21:30:43 UTC (RELENG_4_11, 4.11-RELEASE-p10)
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2005-06-08 21:31:16 UTC (RELENG_4_10, 4.10-RELEASE-p15)
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CVE Name: CAN-2005-0988, CAN-2005-1228
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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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gzip is a file compression utility.
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II. Problem Description
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Two problems related to extraction of files exist in gzip:
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The first problem is that gzip does not properly sanitize filenames
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containing "/" when uncompressing files using the -N command line
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option.
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The second problem is that gzip does not set permissions on newly
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extracted files until after the file has been created and the file
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descriptor has been closed.
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III. Impact
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The first problem can allow an attacker to overwrite arbitrary local
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files when uncompressing a file using the -N command line option.
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The second problem can allow a local attacker to change the
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permissions of arbitrary local files, on the same partition as the one
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the user is uncompressing a file on, by removing the file the user is
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uncompressing and replacing it with a hardlink before the uncompress
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operation is finished.
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IV. Workaround
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Do not use the -N command line option on untrusted files 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-05:11/gzip.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:11/gzip.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/gnu/usr.bin/gzip
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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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src/gnu/usr.bin/gzip/gzip.c 1.10.2.1
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.11
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src/sys/conf/newvers.sh 1.44.2.39.2.14
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src/gnu/usr.bin/gzip/gzip.c 1.10.26.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.16
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src/sys/conf/newvers.sh 1.44.2.34.2.17
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src/gnu/usr.bin/gzip/gzip.c 1.10.24.1
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RELENG_5
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src/gnu/usr.bin/gzip/gzip.c 1.11.2.1
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.11
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src/sys/conf/newvers.sh 1.62.2.18.2.7
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src/gnu/usr.bin/gzip/gzip.c 1.11.6.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.19
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src/sys/conf/newvers.sh 1.62.2.15.2.21
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src/gnu/usr.bin/gzip/gzip.c 1.11.4.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0988
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1228
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http://marc.theaimsgroup.com/?l=bugtraq&m=111271860708210
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http://marc.theaimsgroup.com/?l=bugtraq&m=111402732406477
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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-05:11.gzip.asc
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