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)
97 lines
3.7 KiB
Text
97 lines
3.7 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-00:57 Security Advisory
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FreeBSD, Inc.
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Topic: muh IRC bouncer remote vulnerability
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Category: ports
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Module: muh
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Announced: 2000-10-13
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Credits: Maxime Henrion <mux@QUALYS.COM>
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Affects: Ports collection prior to the correction date.
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Corrected: 2000-09-10 (4.1.1-RELEASE)
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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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muh is an IRC bouncer, a program that allows a host to act as a relay
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between an IRC client on a local/remote machine and the IRC server.
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II. Problem Description
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The muh port, versions 2.05c and before, contains a vulnerability
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which allows remote users to gain the privileges of the user running
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muh. This is accomplished by sending a carefully crafted exploit
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string containing string format operators to a user using muh but who
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is not connected. When the user reconnects and executes '/muh read',
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muh will allow the remote attacker to execute arbitrary code as the
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local user.
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The muh port is not installed by default, nor is it "part of FreeBSD"
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as such: it is part of the FreeBSD ports collection, which contains
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nearly 4000 third-party applications in a ready-to-install format.
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The ports collections shipped with FreeBSD 3.5.1 and 4.1 contain this
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problem since it was discovered after the releases, but it was
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corrected prior to the release of FreeBSD 4.1.1.
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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 IRC users can cause arbitrary code to be executed as the user
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running muh.
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If you have not chosen to install the muh 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 muh 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 muh 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/irc/muh-2.05c.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/irc/muh-2.05c.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/irc/muh-2.05c.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/irc/muh-2.05c.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/irc/muh-2.05c.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 cvsweb 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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