Re: Web bug

From: rj3 Jean-Francois RODRIGUEZ (j-rodr01@bat710.univ-lyon1.fr)
Date: 02/28/03

  • Next message: Timothy Rieder: "Re: Web bug" 
    From: rj3 Jean-Francois RODRIGUEZ <j-rodr01@bat710.univ-lyon1.fr>
Date: Fri, 28 Feb 2003 18:20:53 +0100 (CET)
To: <security-discuss@linuxsecurity.com>

    >
    > Hi All,
    >
    > Can some body explain the following:
    >
    > 1) Can a Web Bug (i.e., display of an image file from a third
    > party web site) be a security problem?

    I don't know about it.

    > 2) Does it cause a cookie to be sent from the browser to that
    > third party web site?

    About that, yes, it is used by advertisers to get cookies when you visit a
    website where they have put (paying $$) such an image.
    When your browser download this image, it must make a connection to the
    advertiser's website where this image comes from, and so they can ask to
    your browser to accept a cookie.By this way, this third party web site can put and read cookies that your
    browser have accepted visiting different web sites, because they all come
    from the same advertiser's web site (and so they can gather different
    information about you : what kind of sites you are usual to visit, so what
    are your interests...).I must have learned all that here : www.searchlores.org

    Regards

    Jean-François

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