94 lines
3.4 KiB
Text
94 lines
3.4 KiB
Text
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-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-00:11 Security Advisory
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FreeBSD, Inc.
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Topic: ircII port contains a remote overflow
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Category: ports
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Module: ircII
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Announced: 2000-04-10
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Credits: Derek Callaway <super@UDEL.EDU> via BugTraq
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"bladi" <bladi@EUSKALNET.NET> via BugTraq
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Affects: Ports collection before the correction date.
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Corrected: 2000-03-19
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FreeBSD only: NO
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I. Background
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ircII is a popular text-mode IRC client.
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II. Problem Description
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ircII version 4.4 contained a remotely-exploitable buffer overflow in
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the /DCC CHAT command which allows remote users to execute arbitrary
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code as the client user.
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The bug was originally reported in 1997 in a much older version of
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ircII, but was apparently not corrected at the time, and the problem
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was recently rediscovered independently. Development on the version of
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ircII previously in ports ceased several years ago, and has been taken
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up by a new group who have fixed this problem (and possibly
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others). FreeBSD now provides this new version of ircII.
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The ircII 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 3200 third-party applications in a ready-to-install
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format. FreeBSD 4.0 did not ship with the ircII package available
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because this vulnerability was reported to us late in the release
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cycle and it was not possible to upgrade the port in time.
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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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A remote user can cause arbitrary code to be executed on the local
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system as the user running ircII.
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If you have not chosen to install the ircII port/package, then your
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system is not known to be vulnerable to this problem, although there
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are several other IRC clients which are derived from ircII including
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Epic and BitchX. At this time it is unknown whether other clients are
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vulnerable to this problem.
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IV. Workaround
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Remove the ircII port, if you you have installed it.
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V. Solution
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1) Upgrade your entire ports collection and rebuild the ircII port.
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2) Reinstall a new package dated after the correction date, obtained from:
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/irc/ircII-4.4S.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/irc/ircII-4.4S.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-3-stable/irc/ircII-4.4S.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/irc/ircII-4.4S.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/irc/ircII-4.4S.tgz
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3) download a new port skeleton for the ircII 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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-----BEGIN PGP SIGNATURE-----
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Version: 2.6.2
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=IU1d
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-----END PGP SIGNATURE-----
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