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)
116 lines
3.9 KiB
Text
116 lines
3.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-00:31 Security Advisory
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FreeBSD, Inc.
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Topic: Canna port contains remote vulnerability [REVISED]
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Category: ports
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Module: Canna
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Announced: 2000-07-05
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Revised: 2000-07-11
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Affects: Ports collection.
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Corrected: 2000-06-29
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Credits: Shadow Penguin Security
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<http://shadowpenguin.backsection.net/advisories/index.html>
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Vendor status: Contacted
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FreeBSD only: NO
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I. Background
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Canna is a Kana-Kanji conversion server.
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II. Problem Description
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The Canna server contains an overflowable buffer which may be
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exploited by a remote user to execute arbitrary code on the local
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system as user 'bin'.
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The Canna 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 3500 third-party applications in a ready-to-install
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format. The ports collection shipped with FreeBSD 3.5 contains this
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vulnerability since it was discovered after 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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Remote users can run arbitrary code as user 'bin' on the local system.
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Depending on the local system configuration, the attacker may be able
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to upgrade privileges further by exploiting local vulnerabilities.
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If you have not chosen to install the Canna 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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1) Deinstall the Canna port/package, if you you have installed it.
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2) Consider limiting remote access to the Canna server using ipfw(8)
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or ipf(8).
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3) Create a /etc/hosts.canna file on the Canna server and list the
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hosts which you wish to allow access to the Canna server. For example,
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if you want to allow access via localhost only, include the following
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in your /etc/hosts.canna file:
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localhost
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unix
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If you want to allow access via localhost and some-other-host.com,
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which has IP address x.y.z.w, include the following:
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localhost
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unix
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x.y.z.w
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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 Canna 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/japanese/ja-Canna-3.2.2.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/japanese/ja-Canna-3.2.2.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/japanese/ja-Canna-3.2.2.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/japanese/ja-Canna-3.2.2.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/japanese/ja-Canna-3.2.2.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 Canna 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/packages/devel/portcheckout-1.0.tgz
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VI. Revision History
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v1.0 2000-07-05 Initial release
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v1.1 2000-07-11 Add additional access-control method submitted by KOJIMA Hajime <kjm@rins.ryukoku.ac.jp>
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Correct package URL. Update size of ports collection.
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