[ GLSA 200410-24 ] MIT krb5: Insecure temporary file use in send-pr.sh

From: Thierry Carrez (koon_at_gentoo.org)
Date: 10/25/04

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To: gentoo-announce@gentoo.org

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    Gentoo Linux Security Advisory GLSA 200410-24
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: MIT krb5: Insecure temporary file use in send-pr.sh
          Date: October 25, 2004
          Bugs: #66359
            ID: 200410-24

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    Synopsis
    ========

    The send-pr.sh script, included in the mit-krb5 package, is vulnerable
    to symlink attacks, potentially allowing a local user to overwrite
    arbitrary files with the rights of the user running the utility.

    Background
    ==========

    MIT krb5 is the free implementation of the Kerberos network
    authentication protocol written by the Massachusetts Institute of
    Technology.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 app-crypt/mit-krb5 <= 1.3.5 >= 1.3.5-r1
                                                              *>= 1.3.4-r1

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

    The send-pr.sh 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
    send-pr.sh 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 MIT krb5 users should upgrade to the latest version:

        # emerge sync

        # emerge -pv ">=app-crypt/mit-krb5-1.3.4-r1"
        # emerge ">=app-crypt/mit-krb5-1.3.4-r1"

    References
    ==========

      [ 1 ] CAN-2004-0971
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0971

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

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

      http://security.gentoo.org/glsa/glsa-200410-24.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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