[Full-Disclosure] [ GLSA 200411-22 ] Davfs2, lvm-user: Insecure tempfile handling

From: Sune Kloppenborg Jeppesen (jaervosz_at_gentoo.org)
Date: 11/11/04

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    To: gentoo-announce@gentoo.org
Date: Thu, 11 Nov 2004 22:17:01 +0100

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    Gentoo Linux Security Advisory GLSA 200411-22
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: Davfs2, lvm-user: Insecure tempfile handling
          Date: November 11, 2004
          Bugs: #68406, #69149
            ID: 200411-22

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    Synopsis
    ========

    Davfs2 and the lvmcreate_initrd script (included in the lvm-user
    package) are both vulnerable to symlink attacks, potentially allowing
    a local user to overwrite arbitrary files with the rights of the user
    running them.

    Background
    ==========

    Davfs2 is a file system driver that allows you to mount a WebDAV server
    as a local disk drive. lvm-user is a package providing userland
    utilities for LVM (Logical Volume Management) 1.x features.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 net-fs/davfs2 < 0.2.2-r1 >= 0.2.2-r1
      2 sys-fs/lvm-user < 1.0.7-r2 >= 1.0.7-r2
        -------------------------------------------------------------------
         2 affected packages on all of their supported architectures.
        -------------------------------------------------------------------

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

    Florian Schilhabel from the Gentoo Linux Security Audit Team found that
    Davfs2 insecurely created .pid files in /tmp. Furthermore, Trustix
    Secure Linux found that the lvmcreate_initrd script, included in the
    lvm-user Gentoo package, also creates temporary files in
    world-writeable directories with predictable names.

    Impact
    ======

    A local attacker could create symbolic links in the temporary files
    directory, pointing to a valid file somewhere on the filesystem. When
    Davfs2 or lvmcreate_initrd is called, this would result in the file
    being overwritten with the rights of the user running the software,
    which could be the root user.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All Davfs2 users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=net-fs/davfs2-0.2.2-r1"

    All lvm-user users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=sys-fs/lvm-user-1.0.7-r2"

    References
    ==========

      [ 1 ] CAN-2004-0972
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0972

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

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

      http://security.gentoo.org/glsa/glsa-200411-22.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/2.0

    _______________________________________________
    Full-Disclosure - We believe in it.
    Charter: http://lists.netsys.com/full-disclosure-charter.html

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