[ GLSA 200409-32 ] getmail: Filesystem overwrite vulnerability

From: Sune Kloppenborg Jeppesen (jaervosz_at_gentoo.org)
Date: 09/23/04

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    To: gentoo-announce@gentoo.org
Date: Thu, 23 Sep 2004 23:00:05 +0200

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    Gentoo Linux Security Advisory GLSA 200409-32
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                                                http://security.gentoo.org/
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      Severity: High
         Title: getmail: Filesystem overwrite vulnerability
          Date: September 23, 2004
          Bugs: #64643
            ID: 200409-32

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    Synopsis
    ========

    getmail contains a vulnerability that could potentially allow any local
    user to create or overwrite files in any directory on the system. This
    flaw can be escalated further and possibly lead to a complete system
    compromise.

    Background
    ==========

    getmail is a reliable fetchmail replacement that supports Maildir,
    Mboxrd and external MDA delivery.

    Affected packages
    =================

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 net-mail/getmail < 4.2.0 >= 4.2.0

    Description
    ===========

    David Watson discovered a vulnerability in getmail when it is
    configured to run as root and deliver mail to the maildirs/mbox files
    of untrusted local users. A malicious local user can then exploit a
    race condition, or a similar symlink attack, and potentially cause
    getmail to create or overwrite files in any directory on the system.

    Impact
    ======

    An untrusted local user could potentially create or overwrite files in
    any directory on the system. This vulnerability may also be exploited
    to have arbitrary commands executed as root.

    Workaround
    ==========

    Do not run getmail as a privileged user; or, in version 4, use an
    external MDA with explicitly configured user and group privileges.

    Resolution
    ==========

    All getmail users should upgrade to the latest version:

        # emerge sync

        # emerge -pv ">=net-mail/getmail-4.2.0"
        # emerge ">=net-mail/getmail-4.2.0"

    References
    ==========

      [ 1 ] getmail ChangeLog
            http://www.qcc.ca/~charlesc/software/getmail-4/CHANGELOG
      [ 2 ] getmail Mailing List
            http://article.gmane.org/gmane.mail.getmail.user/1430

    Availability
    ============

    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:

      http://security.gentoo.org/glsa/glsa-200409-32.xml

    Concerns?
    =========

    Security is a primary focus of Gentoo Linux and ensuring the
    confidentiality and security of our users machines is of utmost
    importance to us. Any security concerns should be addressed to
    security@gentoo.org or alternatively, you may file a bug at
    http://bugs.gentoo.org.

    License
    =======

    Copyright 2004 Gentoo Foundation, Inc; referenced text
    belongs to its owner(s).

    The contents of this document are licensed under the
    Creative Commons - Attribution / Share Alike license.

    http://creativecommons.org/licenses/by-sa/1.0

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