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)
121 lines
4.6 KiB
Text
121 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-04:09.kadmind Security Advisory
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The FreeBSD Project
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Topic: heimdal kadmind remote heap buffer overflow
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Category: contrib
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Module: crypto_heimdal
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Announced: 2004-05-05
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Credits: Evgeny Demidov, VulnDisco, Love Hornquist-Astrand
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Affects: FreeBSD 4 systems built with both Kerberos 4 and Kerberos 5.
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FreeBSD 5 systems prior to 5.1 built with both Kerberos 4 and
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Kerberos 5.
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Corrected: 2004-05-05 20:19:48 UTC (RELENG_4, 4.10-PRERELEASE)
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2004-05-05 20:48:57 UTC (RELENG_4_10, 4.10-RELEASE-RC)
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2004-05-05 20:15:56 UTC (RELENG_4_9, 4.9-RELEASE-p7)
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2004-05-05 20:17:51 UTC (RELENG_4_8, 4.8-RELEASE-p20)
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CVE Name: CAN-2004-0434
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FreeBSD only: NO
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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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Heimdal implements the Kerberos 5 network authentication protocols.
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The k5admind(8) daemon provides the administrative interface to the
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Kerberos Key Distribution Center (KDC). In some configurations,
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k5admind also includes Kerberos 4 compatibility.
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NOTE: FreeBSD versions prior to 5.1-RELEASE contain optional Kerberos
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4 support. FreeBSD versions 5.1-RELEASE and later do not include
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Kerberos 4 support of any kind.
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II. Problem Description
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An input validation error was discovered in the k5admind code that
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handles the framing of Kerberos 4 compatibility administration
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requests. The code assumed that the length given in the framing was
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always two or more bytes. Smaller lengths will cause k5admind to read
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an arbitrary amount of data into a minimally-sized buffer on the heap.
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Note that this code is not present unless k5admind has been compiled
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with Kerberos 4 support. This will occur if a FreeBSD system is
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compiled with both of the WITH_KERBEROS4 and WITH_KERBEROS5 build flags.
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These flags are never simultaneously set during the FreeBSD binary
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release process; consequently, binary installs of FreeBSD (even with
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Kerberos support installed) are not affected.
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III. Impact
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A remote attacker may send a specially formatted message to k5admind,
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causing it to crash or possibly resulting in arbitrary code execution.
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IV. Workaround
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Disable the Kerberos 4 support in k5admind by running it with the
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`--no-kerberos4' option.
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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 to the RELENG_4_9 or
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RELENG_4_8 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 4.8 and
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4.9.
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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-04:09/kadmind.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:09/kadmind.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/kerberos5/tools
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# make obj && make depend && make
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# cd /usr/src/kerberos5/lib
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# make obj && make depend && make
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# cd /usr/src/kerberos5/libexec/k5admind
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# make obj && make depend && make all 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/crypto/heimdal/kadmin/version4.c 1.1.1.1.2.6
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RELENG_4_10
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src/crypto/heimdal/kadmin/version4.c 1.1.1.1.2.5.6.1
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RELENG_4_9
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src/UPDATING 1.73.2.89.2.8
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src/crypto/heimdal/kadmin/version4.c 1.1.1.1.2.5.4.1
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src/sys/conf/newvers.sh 1.44.2.32.2.8
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RELENG_4_8
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src/UPDATING 1.73.2.80.2.23
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src/crypto/heimdal/kadmin/version4.c 1.1.1.1.2.5.2.1
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src/sys/conf/newvers.sh 1.44.2.29.2.21
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- -------------------------------------------------------------------------
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-----BEGIN PGP SIGNATURE-----
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-----END PGP SIGNATURE-----
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