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)
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4 KiB
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105 lines
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Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-00:26 Security Advisory
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FreeBSD, Inc.
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Topic: popper port contains remote vulnerability [REVISED]
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Category: ports
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Module: popper
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Announced: 2000-07-05
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Revised: 2000-07-11
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Credits: Prizm <prizm@RESENTMENT.ORG>
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Affects: Ports collection.
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Corrected: 2000-05-25
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Vendor status: Notified
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FreeBSD only: NO
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I. Background
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QPopper is a popular POP3 mail server.
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II. Problem Description
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The qpopper port, version 2.53 and earlier, incorrectly parses string
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formatting operators included in part of the email message header. A
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remote attacker can send a malicious email message to a local user
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which can cause arbitrary code to be executed on the server when a POP
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client retrieves the message using the UIDL command. The code is
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executed as the user who is retrieving mail: thus if root reads email
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via POP3 this can lead to a root compromise. This vulnerability is
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not present in qpopper-3.0.2, also available in FreeBSD ports.
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The qpopper 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 4.0 contains this
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problem since it was discovered after the release, but it was fixed in
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time for FreeBSD 3.5.
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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 cause arbitrary code to be executed as the retrieving
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user when a POP client retrieves email.
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If you have not chosen to install the qpopper-2.53 port/package, then
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your system is not vulnerable to this problem.
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IV. Workaround
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Deinstall the qpopper-2.53 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 qpopper port,
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or upgrade to qpopper-3.0.2 available in /usr/ports/mail/popper3.
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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/mail/qpopper-2.53.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/mail/qpopper-2.53.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/mail/qpopper-2.53.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/mail/qpopper-2.53.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/mail/qpopper-2.53.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/mail/qpopper3-3.0.2.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/mail/qpopper3-3.0.2.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/mail/qpopper3-3.0.2.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/mail/qpopper3-3.0.2.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/mail/qpopper3-3.0.2.tgz
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3) download a new port skeleton for the qpopper 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 Correct URL of qpopper-2.53 package and note availability of
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qpopper3-3.0.2. Update size of ports collection.
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