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)
100 lines
3.9 KiB
Text
100 lines
3.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-00:71 Security Advisory
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FreeBSD, Inc.
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Topic: mgetty can create or overwrite files
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Category: ports
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Module: mgetty
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Announced: 2000-11-20
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Credits: Stan Bubrouski <satan@FASTDIAL.NET>
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Affects: Ports collection prior to the correction date.
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Corrected: 2000-9-10
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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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mgetty is a replacement for the getty utility designed for use with
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data and fax modems.
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II. Problem Description
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The mgetty port, versions prior to 1.1.22.8.17, contains a
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vulnerability that may allow local users to create or overwrite any
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file on the system. This is due to the faxrunqd daemon (which usually
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runs as root) following symbolic links when creating a .last_run file
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in the world-writable /var/spool/fax/outgoing/ directory.
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This presents a denial of service attack since the attacker can cause
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critical system files to be overwritten, but it is not believed the
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attacker has the ability to control the contents of the overwritten
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file. Therefore the possibility of using this attack to elevate
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privileges is believed to be minimal.
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The mgetty 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 4100 third-party applications in a ready-to-install
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format. The ports collections shipped with FreeBSD 3.5.1 and 4.1.1
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contain this problem since it was discovered after the releases, but
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it was corrected prior to the release of FreeBSD 4.2.
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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 create or overwrite any file on the
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system.
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If you have not chosen to install the mgetty 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 mgetty port/package, if you 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 mgetty 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/comms/mgetty-1.1.22.8.17.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/comms/mgetty-1.1.22.8.17.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/comms/mgetty-1.1.22.8.17.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/comms/mgetty-1.1.22.8.17.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/comms/mgetty-1.1.22.8.17.tgz
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3) download a new port skeleton for the mgetty 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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