[Full-disclosure] [ GLSA 200509-21 ] Hylafax: Insecure temporary file creation in xferfaxstats script

From: Thierry Carrez (koon_at_gentoo.org)
Date: 09/30/05

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To: gentoo-announce@lists.gentoo.org

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    Gentoo Linux Security Advisory GLSA 200509-21
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: Hylafax: Insecure temporary file creation in xferfaxstats
                script
          Date: September 30, 2005
          Bugs: #106882
            ID: 200509-21

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    Synopsis
    ========

    Hylafax is vulnerable to linking attacks, potentially allowing a local
    user to overwrite arbitrary files.

    Background
    ==========

    Hylafax is a client-server fax package for class 1 and 2 fax modems.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 net-misc/hylafax < 4.2.2 *>= 4.2.0-r3
                                                              *>= 4.2.1-r2
    >= 4.2.2

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

    Javier Fernandez-Sanguino has discovered that xferfaxstats cron script
    supplied by Hylafax insecurely creates temporary files with predictable
    filenames.

    Impact
    ======

    A local attacker could create symbolic links in the temporary file
    directory, pointing to a valid file somewhere on the filesystem. When
    the xferfaxstats script of Hylafax is executed, this would result in
    the file being overwritten with the rights of the user running the
    script, which typically is the root user.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All Hylafax users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose net-misc/hylafax

    References
    ==========

      [ 1 ] Original bug report
            http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=329384

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

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

      http://security.gentoo.org/glsa/glsa-200509-21.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 2005 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/2.0

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