Re: [Full-Disclosure] Execution Flow Control (EFC)

From: Jon Hart (warchild_at_spoofed.org)
Date: 08/16/03

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    To: Shanphen Dawa <list@hardlined.com>
Date: Sat, 16 Aug 2003 16:01:35 -0400

    On Sat, Aug 16, 2003 at 07:13:50AM -0500, Shanphen Dawa wrote:
    > This was posted to bugtraq.
    >
    > http://www.securityfocus.com/archive/1/333451/2003-08-13/2003-08-19/0
    >
    > The author of the software claims any machine running this
    > Execution Flow Control (EFC) program is 100%. I think 100% is a tad
    > bit arrogant, and I can't wait till he has to eat his words. The
    > website is a tad under the professional type websites I would take
    > seriously, but I thought this might spark a good discussion, and get
    > us off that bl*st*r w*rm.
    >
    > http://203.197.88.14/
    > http://203.197.88.14/efc

    This line from http://203.197.88.14/efc/efc_intro.php really caught my
    eye:

     PROS AND CONS OF EFC.

        1. Can protect against known or unknown vulnerabilities.

    Ok, with that in mind, lets see how well it stands up to "unknown"
    attacks...

    I'm not one to judge product quality based (partially or otherwise) on
    past or current programming mistakes, but if I was, I'd say that
    something like:

    for(i=0;arg[i]; i++) {
            if ((strncmp(arg[i], "/etc/shadow",11) == 0) ||
                    (strncmp(arg[i], "shadow",6) == 0)) {
                            write(1,"arg cannot be shadow\n", 21);
                            return 0;
            }
    }

    is a pretty poor way of making sure people don't play with your shadow
    file. There are many possibilities here, but the bottom line is that
    the webserver had a poorly written CGI application and EFC didn't seem
    to do much in the way of stopping someone from exploiting it and
    stealing the shadow file.

    fwiw,

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

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