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)
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130 lines
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-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-06:15.ypserv Security Advisory
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The FreeBSD Project
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Topic: Inoperative access controls in ypserv(8)
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Category: core
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Module: ypserv
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Announced: 2006-05-31
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Credits: Hokan
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Affects: All FreeBSD 5.x and FreeBSD 6.x releases
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Corrected: 2006-05-31 22:31:21 UTC (RELENG_6, 6.1-STABLE)
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2006-05-31 22:31:42 UTC (RELENG_6_1, 6.1-RELEASE-p1)
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2006-05-31 22:32:04 UTC (RELENG_6_0, 6.0-RELEASE-p8)
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2006-05-31 22:32:22 UTC (RELENG_5, 5.5-STABLE)
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2006-05-31 22:32:49 UTC (RELENG_5_5, 5.5-RELEASE-p1)
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2006-05-31 22:33:17 UTC (RELENG_5_4, 5.4-RELEASE-p15)
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2006-05-31 22:33:41 UTC (RELENG_5_3, 5.3-RELEASE-p30)
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CVE Name: CVE-2006-2655
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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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The ypserv(8) utility is a server which distributes NIS databases to client
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systems within an NIS domain.
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II. Problem Description
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There are two documented methods of restricting access to NIS maps through
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ypserv(8): through the use of the /var/yp/securenets file, and through the
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/etc/hosts.allow file. While both mechanisms are implemented in the server,
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a change in the build process caused the "securenets" access restrictions
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to be inadvertantly disabled.
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III. Impact
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ypserv(8) will not load or process any of the networks or hosts specified in
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the /var/yp/securenets file, rendering those access controls ineffective.
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IV. Workaround
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One possible workaround is to use /etc/hosts.allow for access control, as
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shown by examples in that file.
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Another workaround is to use a firewall (e.g., ipfw(4), ipf(4), or pf(4))
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to limit access to RPC functions from untrusted systems or networks, but
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due to the complexities of RPC, it might be difficult to create a set of
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firewall rules which accomplish this without blocking all access to the
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machine in question.
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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 6-STABLE, or to the
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RELENG_6_1, RELENG_6_0, RELENG_5_5, RELENG_5_4, or RELENG_5_3 security
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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, 5.4,
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5.5, 6.0, and 6.1 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-06:15/ypserv.patch
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# fetch http://security.FreeBSD.org/patches/SA-06:15/ypserv.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.sbin/ypserv
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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/usr.sbin/ypserv/yp_access.c 1.22.6.1
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RELENG_5_5
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src/UPDATING 1.342.2.35.2.1
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src/sys/conf/newvers.sh 1.62.2.21.2.3
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src/usr.sbin/ypserv/yp_access.c 1.22.18.1
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.24
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src/sys/conf/newvers.sh 1.62.2.18.2.20
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src/usr.sbin/ypserv/yp_access.c 1.22.10.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.33
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src/sys/conf/newvers.sh 1.62.2.15.2.35
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src/usr.sbin/ypserv/yp_access.c 1.22.8.1
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RELENG_6
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src/usr.sbin/ypserv/yp_access.c 1.22.12.1
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RELENG_6_1
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src/UPDATING 1.416.2.22.2.3
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src/sys/conf/newvers.sh 1.69.2.11.2.3
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src/usr.sbin/ypserv/yp_access.c 1.22.16.1
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RELENG_6_0
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src/UPDATING 1.416.2.3.2.13
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src/sys/conf/newvers.sh 1.69.2.8.2.9
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src/usr.sbin/ypserv/yp_access.c 1.22.14.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2655
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-06:15.ypserv.asc
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