OSEC

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From: Attonbitus Deus (ThorHAMMEROFGOD.COM)
Date: Tue Jan 30 2001 - 10:07:45 CST

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    After vehemently defending the procedures outlined in the many articles,
    KB's, and publications from MS regarding the best practices of EFS use, I
    have come across some new information (to me, anyway) which mandates that I
    consume a morsel of crow.

    After continuing to experiment with different procedures, I found that the
    EFS0.TMP file is NOT created in the path set in your TEMP/TMP environment
    variable, but rather in the source drive of the newly encrypted file.
    AFAIAC, this changes things a bit. So, even if you did follow the procs to
    the letter and encrypt your Temp dir so that all newly created temp files
    were also encrypted, you would still leave this guy in plain text by
    default. Granted, they always say to create new files in encrypted dirs,
    but given this caveat, I have to agree that the issue carries more weight
    than I originally maintained. Since they don't follow the TMP environmental
    variable, the temp file should indeed be wiped, or it should not allow you
    to encrypt individual files in the first place.

    So, though I still maintain that the exploitability of this issue is remote,
    I must acquiesce to Rickard and Dan's statements as being factual. If the
    true location of the temp file was known all along, then I apologize for
    dragging this thing out as I did.

    Thanks to all.
    ---------------------------------
    Attonbitus Deus
    ThorHammerofGod.Com