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)
98 lines
3.6 KiB
Text
98 lines
3.6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-00:43 Security Advisory
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FreeBSD, Inc.
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Topic: brouted port allows gid kmem compromise
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Category: ports
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Module: brouted
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Announced: 2000-08-28
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Credits: Discovered during internal auditing
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Affects: Ports collection prior to the correction date.
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Corrected: 2000-08-22
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Vendor status: Contacted
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FreeBSD only: NO
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I. Background
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brouted is a dynamic routing daemon.
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II. Problem Description
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The brouted port is incorrectly installed setgid kmem, and contains
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several exploitable buffer overflows in command-line arguments. An
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attacker exploiting these to gain kmem privilege can easily upgrade to
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full root access by manipulating kernel memory.
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The brouted 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 during internal auditing.
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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 can obtain group kmem privileges, and upgrade
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further to full root privileges.
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If you have not chosen to install the brouted 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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Execute the following command as root to remove the setgid bit on the
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/usr/local/sbin/brouted file:
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# chmod g-s /usr/local/bin/brouted
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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 brouted 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/net/brouted-1.2b.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/net/brouted-1.2b.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/net/brouted-1.2b.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/net/brouted-1.2b.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/net/brouted-1.2b.tgz
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NOTE: It may be several days before updated packages are available. Be
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sure to check the file creation date on the package, because the
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version number of the software has not changed.
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3) download a new port skeleton for the brouted 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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