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)
112 lines
3.8 KiB
Text
112 lines
3.8 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:18.zlib Security Advisory
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The FreeBSD Project
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Topic: Buffer overflow in zlib
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Category: core
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Module: libz
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Announced: 2005-07-27
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Credits: Markus Oberhumer
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Affects: FreeBSD 5.3, FreeBSD 5.4
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Corrected: 2005-07-27 08:41:44 UTC (RELENG_6, 6.0-BETA2)
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2005-07-27 08:41:56 UTC (RELENG_5, 5.4-STABLE)
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2005-07-27 08:42:16 UTC (RELENG_5_4, 5.4-RELEASE-p6)
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2005-07-27 08:42:38 UTC (RELENG_5_3, 5.3-RELEASE-p20)
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CVE Name: CAN-2005-1849
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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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NOTE WELL: The issue discussed in this advisory is distinct from the
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issue discussed in the earlier advisory FreeBSD-SA-05:16.zlib, although
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the impact is very similar.
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I. Background
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zlib is a compression library used by numerous applications to provide
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data compression/decompression routines.
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II. Problem Description
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A fixed-size buffer is used in the decompression of data streams. Due
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to erronous analysis performed when zlib was written, this buffer,
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which was belived to be sufficiently large to handle any possible input
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stream, is in fact too small.
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III. Impact
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A carefully constructed compressed data stream can result in zlib
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overwriting some data structures. This may cause applications to halt,
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resulting in a denial of service; or it may result in an attacker
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gaining elevated privileges.
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IV. Workaround
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No workaround is available.
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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 5-STABLE, or to the RELENG_5_4 or
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RELENG_5_3 security branch 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 5.3, and 5.4
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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-05:18/zlib.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:18/zlib.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/libz/
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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_5
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src/lib/libz/inftrees.h 1.1.1.5.2.1
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.15
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src/sys/conf/newvers.sh 1.62.2.18.2.11
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src/lib/libz/inftrees.h 1.1.1.5.6.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.23
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src/sys/conf/newvers.sh 1.62.2.15.2.25
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src/lib/libz/inftrees.h 1.1.1.5.4.1
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RELENG_6
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src/lib/libz/inftrees.h 1.1.1.5.8.1
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- -------------------------------------------------------------------------
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VII. References
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http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1849
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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-05:18.zlib.asc
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