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)
148 lines
5.9 KiB
Text
148 lines
5.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-06:16.smbfs Security Advisory
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The FreeBSD Project
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Topic: smbfs chroot escape
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Category: core
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Module: smbfs
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Announced: 2006-05-31
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Credits: Mark Moseley
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Affects: All FreeBSD 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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2006-05-31 22:34:32 UTC (RELENG_4, 4.11-STABLE)
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2006-05-31 22:34:53 UTC (RELENG_4_11, 4.11-RELEASE-p18)
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2006-05-31 22:35:32 UTC (RELENG_4_10, 4.10-RELEASE-p24)
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CVE Name: CVE-2006-2654
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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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smbfs is a network file-system used to access file servers using the
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SMB/CIFS protocol. chroot(2) is system call designed to limit a
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process's access to a particular subset of a file-system.
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II. Problem Description
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smbfs does not properly sanitize paths containing a backslash
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character; in particular the directory name '..\' is interpreted as
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the parent directory by the SMB/CIFS server, but smbfs handles it in
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the same manner as any other directory.
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III. Impact
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When inside a chroot environment which resides on a smbfs mounted
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file-system it is possible for an attacker to escape out of this
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chroot to any other directory on the smbfs mounted file-system.
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IV. Workaround
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Mount the smbfs file-systems which need to be used with chroot on top,
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in a way so the chroot directory is exactly on the mount point and not
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a sub directory.
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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, 5-STABLE, or 6-STABLE,
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or to the RELENG_6_1, RELENG_6_0, RELENG_5_5, RELENG_5_4, RELENG_5_3,
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RELENG_4_11, or RELENG_4_10 security branch dated after the correction
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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, 5.4, 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-06:16/smbfs.patch
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# fetch http://security.FreeBSD.org/patches/SA-06:16/smbfs.patch.asc
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b) Apply the patch.
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile your kernel as described in
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<URL:http://www.freebsd.org/handbook/kernelconfig.html> and reboot the
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system.
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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/sys/fs/smbfs/smbfs_vnops.c 1.2.2.11
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.19
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src/sys/conf/newvers.sh 1.44.2.39.2.22
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src/sys/fs/smbfs/smbfs_vnops.c 1.2.2.10.4.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.25
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src/sys/conf/newvers.sh 1.44.2.34.2.26
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src/sys/fs/smbfs/smbfs_vnops.c 1.2.2.10.2.1
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RELENG_5
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src/sys/fs/smbfs/smbfs_vnops.c 1.46.2.2
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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/sys/fs/smbfs/smbfs_vnops.c 1.46.2.1.4.1
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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/sys/fs/smbfs/smbfs_vnops.c 1.46.2.1.2.1
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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/sys/fs/smbfs/smbfs_vnops.c 1.46.4.1
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RELENG_6
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src/sys/fs/smbfs/smbfs_vnops.c 1.61.2.2
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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/sys/fs/smbfs/smbfs_vnops.c 1.61.2.1.2.1
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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/sys/fs/smbfs/smbfs_vnops.c 1.61.4.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2654
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The following three references correspond to independent bugs which
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affect the Linux kernel but have the same impact:
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1863
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1864
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https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=189434
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-06:16.smbfs.asc
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