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)
106 lines
4 KiB
Text
106 lines
4 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-01:36 Security Advisory
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FreeBSD, Inc.
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Topic: samba ports contain locally exploitable /tmp races
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Category: ports
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Module: samba
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Announced: 2001-04-23
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Credits: Marcus Meissner <Marcus.Meissner@caldera.de>
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Affects: Ports collection prior to the correction date.
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Corrected: 2001-04-18
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Vendor status: Updated version released
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FreeBSD only: No
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I. Background
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Samba is an implementation of the Server Message Block (SMB)
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protocol.
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II. Problem Description
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The samba ports, versions prior to samba-2.0.8 and samba-devel-2.2.0,
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contain /tmp races that may allow local users to cause arbitrary
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files and devices to be overwritten. Due to easily predictable
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printer queue cache file names, local users may create symbolic links
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to any file or device causing it to be corrupted when a remote user
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accesses a printer. In addition, the file will be left with world-
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writable permission allowing any user to enter their own data.
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The samba ports are not installed by default, nor are they "part of
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FreeBSD" as such: they are part of the FreeBSD ports collection, which
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contains over 5000 third-party applications in a ready-to-install
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format. The ports collections shipped with FreeBSD 3.5.1 and 4.2
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contain this problem since it was discovered after the releases.
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The ports collection that shipped with FreeBSD 4.3 is not vulnerable
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since this problem was corrected prior to the release.
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FreeBSD makes no claim about the security of these third-party
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applications, although an effort is underway to provide a security
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audit of the most security-critical ports.
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III. Impact
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Unprivileged local users may cause arbitrary files or devices to be
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corrupted and gain increased privileges on the local system.
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If you have not chosen to install the samba ports/packages, then
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your system is not vulnerable to this problem.
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Samba servers that do not have any printers configured are not
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vulnerable.
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IV. Workaround
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Deinstall the samba port/package, if you have installed it.
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V. Solution
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One of the following:
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1) Upgrade your entire ports collection and rebuild the samba port.
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2) Deinstall the old package and install a new package dated after the
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correction date, obtained from:
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[i386]
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/net/samba-2.0.8.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/net/samba-2.0.8.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/net/samba-devel-2.2.0.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/net/samba-devel-2.2.0.tgz
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NOTE: it may be several days before updated packages are available.
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[alpha]
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Packages are not automatically generated for the alpha architecture at
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this time due to lack of build resources.
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3) download a new port skeleton for the samba from:
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http://www.freebsd.org/ports/
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and use it to rebuild the port.
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4) Use the portcheckout utility to automate option (3) above. The
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portcheckout port is available in /usr/ports/devel/portcheckout or the
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package can be obtained from:
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz
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