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)
150 lines
5.6 KiB
Text
150 lines
5.6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-11:01.mountd Security Advisory
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The FreeBSD Project
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Topic: Network ACL mishandling in mountd(8)
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Category: core
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Module: mountd
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Announced: 2011-04-20
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Credits: Ruslan Ermilov
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Affects: All supported versions of FreeBSD
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Corrected: 2011-04-20 21:00:24 UTC (RELENG_7, 7.4-STABLE)
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2011-04-20 21:00:24 UTC (RELENG_7_3, 7.3-RELEASE-p5)
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2011-04-20 21:00:24 UTC (RELENG_7_4, 7.4-RELEASE-p1)
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2011-04-20 21:00:24 UTC (RELENG_8, 8.2-STABLE)
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2011-04-20 21:00:24 UTC (RELENG_8_1, 8.1-RELEASE-p3)
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2011-04-20 21:00:24 UTC (RELENG_8_2, 8.2-RELEASE-p1)
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CVE Name: CVE-2011-1739
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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 mountd(8) daemon services NFS mount requests from other client
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machines. When mountd is started, it loads the export host addresses
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and options into the kernel using the mount(2) system call.
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II. Problem Description
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While parsing the exports(5) table, a network mask in the form of
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"-network=netname/prefixlength" results in an incorrect network mask
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being computed if the prefix length is not a multiple of 8.
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For example, specifying the ACL for an export as "-network 192.0.2.0/23"
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would result in a netmask of 255.255.127.0 being used instead of the
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correct netmask of 255.255.254.0.
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III. Impact
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When using a prefix length which is not multiple of 8, access would be
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granted to the wrong client systems.
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IV. Workaround
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For IPv4-only systems, using the -netmask option instead of CIDR notion
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for -network circumvents this bug.
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A firewall such as pf(4) can (and probably should) be used to restrict
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access to the NFS server.
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Systems not providing NFS service, or using a prefix length which is a
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multiple of 8 in all ACLs, are not affected.
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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 the
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RELENG_8_2, RELENG_8_1, RELENG_7_4, RELENG_7_3 security branch dated
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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 7.3, 7.4,
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8.1 and 8.2 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-11:01/mountd.patch
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# fetch http://security.FreeBSD.org/patches/SA-11:01/mountd.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/mountd
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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 7.3-RELEASE, 7.4-RELEASE, 8.1-RELEASE or 8.2-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.sbin/mountd/mountd.c 1.94.2.3
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RELENG_7_4
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src/UPDATING 1.507.2.36.2.3
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src/sys/conf/newvers.sh 1.72.2.18.2.6
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src/usr.sbin/mountd/mountd.c 1.94.2.2.8.2
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RELENG_7_3
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src/UPDATING 1.507.2.34.2.7
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src/sys/conf/newvers.sh 1.72.2.16.2.9
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src/usr.sbin/mountd/mountd.c 1.94.2.2.6.2
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RELENG_8
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src/usr.sbin/mountd/mountd.c 1.105.2.3
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RELENG_8_2
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src/UPDATING 1.632.2.19.2.3
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src/sys/conf/newvers.sh 1.83.2.12.2.6
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src/usr.sbin/mountd/mountd.c 1.105.2.2.4.2
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RELENG_8_1
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src/UPDATING 1.632.2.14.2.6
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src/sys/conf/newvers.sh 1.83.2.10.2.7
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src/usr.sbin/mountd/mountd.c 1.105.2.2.2.2
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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/ r220901
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releng/7.3/ r220901
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releng/7.4/ r220901
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stable/8/ r220901
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releng/8.1/ r220901
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releng/8.2/ r220901
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1739
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-11:01.mountd.asc
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