[Full-Disclosure] [ GLSA 200410-19 ] glibc: Insecure tempfile handling in catchsegv script

From: Luke Macken (lewk_at_gentoo.org)
Date: 10/21/04

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    To: gentoo-announce@gentoo.org
Date: Thu, 21 Oct 2004 09:45:10 -0400

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    Gentoo Linux Security Advisory GLSA 200410-19
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: glibc: Insecure tempfile handling in catchsegv script
          Date: October 21, 2004
          Bugs: #66358
            ID: 200410-19

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    Synopsis
    ========

    The catchsegv script in the glibc package is vulnerable to symlink
    attacks, potentially allowing a local user to overwrite arbitrary
    files with the rights of the user running the script.

    Background
    ==========

    glibc is a package that contains the GNU C library.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 sys-libs/glibc <= 2.3.4.20040808 *>= 2.2.5-r9
                                                             *>= 2.3.2-r12
                                                     *>= 2.3.3.20040420-r2
                                                     *>= 2.3.4.20040619-r2
    >= 2.3.4.20040808-r1

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

    The catchsegv script 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
    catchsegv script is called, this would result in the file being
    overwritten 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 glibc users should upgrade to the latest version:

        # emerge sync

        # emerge -pv sys-libs/glibc
        # emerge sys-libs/glibc

    References
    ==========

      [ 1 ] CAN-2004-0968
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0968

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

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

      http://security.gentoo.org/glsa/glsa-200410-19.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 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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    Charter: http://lists.netsys.com/full-disclosure-charter.html

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