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)
96 lines
3.6 KiB
Text
96 lines
3.6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-01:17 Security Advisory
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FreeBSD, Inc.
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Topic: exmh symlink vulnerability
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Category: ports
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Module: exmh2
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Announced: 2001-01-29
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Credits: Stanley G. Bubrouski <stan@CCS.NEU.EDU>
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Affects: Ports collection prior to the correction date.
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Corrected: 2001-01-22
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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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exmh is a tcl/tk based interface to the mh mail user agent.
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II. Problem Description
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The exmh2 port, versions prior to 2.3.1, contains a local
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vulnerability: at startup, if exmh detects a problem in its code or
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configuration an error dialog appears giving the user an option to
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fill in a bug report and email it to the maintainer. If the user
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agrees to mail the maintainer a file named /tmp/exmhErrorMsg is
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created. If the file exists and is a symlink, it will follow the
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link, allowing local files writable by the user to be overwritten.
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The exmh2 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 4500 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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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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Malicious local users may cause arbitrary files writable by the user
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running exmh to be overwritten, in certain restricted situations.
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If you have not chosen to install the exmh2 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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Deinstall the exmh2 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 exmh2 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/mail/exmh-2.3.1.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/mail/exmh-2.3.1.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/mail/exmh-2.3.1.tgz
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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 exmh2 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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