[Full-Disclosure] [ GLSA 200410-07 ] ed: Insecure temporary file handling

From: Thierry Carrez (koon_at_gentoo.org)
Date: 10/09/04

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    To: gentoo-announce@lists.gentoo.org
Date: Sat, 09 Oct 2004 20:17:10 +0200

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    Gentoo Linux Security Advisory GLSA 200410-07
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: ed: Insecure temporary file handling
          Date: October 09, 2004
          Bugs: #66400
            ID: 200410-07

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    Synopsis
    ========

    The ed utility is vulnerable to symlink attacks, potentially allowing a
    local user to overwrite or change rights on arbitrary files with the
    rights of the user running ed, which could be the root user.

    Background
    ==========

    ed is a line-oriented text editor, used to create or modify text files,
    both interactively and via shell scripts.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 sys-apps/ed <= 0.2-r3 >= 0.2-r4

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

    ed insecurely creates temporary files in world-writeable directories
    with predictable names. Given that ed is used in various system shell
    scripts, they are by extension affected by the same vulnerability.

    Impact
    ======

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

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All ed users should upgrade to the latest version:

        # emerge sync

        # emerge -pv ">=sys-apps/ed-0.2-r4"
        # emerge ">=sys-apps/ed-0.2-r4"

    References
    ==========

      [ 1 ] CVE-2000-1137
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-1137

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

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

      http://security.gentoo.org/glsa/glsa-200410-07.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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