[ GLSA 200508-19 ] lm_sensors: Insecure temporary file creation

From: Thierry Carrez (koon_at_gentoo.org)
Date: 08/30/05

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    Date: Tue, 30 Aug 2005 16:28:04 +0200
To: gentoo-announce@lists.gentoo.org

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    Gentoo Linux Security Advisory GLSA 200508-19
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: lm_sensors: Insecure temporary file creation
          Date: August 30, 2005
          Bugs: #103568
            ID: 200508-19

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    Synopsis
    ========

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

    Background
    ==========

    lm_sensors is a software package that provides drivers for monitoring
    the temperatures, voltages, and fans of Linux systems with hardware
    monitoring devices.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 sys-apps/lm_sensors < 2.9.1-r1 >= 2.9.1-r1

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

    Javier Fernandez-Sanguino Pena has discovered that lm_sensors
    insecurely creates temporary files with predictable filenames when
    saving configurations.

    Impact
    ======

    A local attacker could create symbolic links in the temporary file
    directory, pointing to a valid file somewhere on the filesystem. When
    the pwmconfig script of lm_sensors 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 lm_sensors users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=sys-apps/lm_sensors-2.9.1-r1"

    References
    ==========

      [ 1 ] CAN-2005-2672
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2672

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

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

      http://security.gentoo.org/glsa/glsa-200508-19.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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