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)
103 lines
3.9 KiB
Text
103 lines
3.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-00:44 Security Advisory
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FreeBSD, Inc.
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Topic: xlockmore port allows reading of password file
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Category: ports
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Module: xlockmore
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Announced: 2000-08-28
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Credits: bind <bind@SUBTERRAIN.NET>
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Affects: Ports collection prior to the correction date.
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Corrected: 2000-08-15
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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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xlockmore is a utility for locking console access to an X terminal.
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II. Problem Description
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The xlockmore port, versions 4.17 and below, installs the setuid root
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binary xlock, which contains a vulnerability due to incorrect use of
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the syslog() function. The xlock program correctly drops root
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privileges prior to the point of vulnerability, however it may retain
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in memory part of the hashed password database for the user accounts
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on the system.
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Attackers who can retrieve hashed password information from the memory
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space of the process can mount attacks against the user account
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passwords and possibly gain access to accounts on the system if
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successful.
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The xlockmore port is not installed by default, nor is it "part of
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FreeBSD" as such: it is part of the FreeBSD ports collection, which
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contains over 3700 third-party applications in a ready-to-install
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format. The ports collections shipped with FreeBSD 3.5-RELEASE and
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4.1-RELEASE contain this problem, since it was discovered after the
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releases.
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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 be able to gain unauthorised access to
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parts of the /etc/spwd.db file, allowing them to mount guessing
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attacks against user passwords.
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If you have not chosen to install the xlockmore port/package, then your
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system is not vulnerable to this problem.
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IV. Workaround
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One of the following:
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Deinstall the xlockmore 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 xlockmore 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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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/x11/xlockmore-4.17.1.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/x11/xlockmore-4.17.1.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/x11/xlockmore-4.17.1.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/x11/xlockmore-4.17.1.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/x11/xlockmore-4.17.1.tgz
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NOTE: It may be several days before updated packages are available.
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3) download a new port skeleton for the xlockmore port 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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