Re: The Dangers of Allowing Users to Post Images

From: Michal Szokolo (msz@kill-spammers.pmp.com.pl)
Date: Sat Jun 23 2001 - 19:02:33 PDT

  • Next message: joshuaat_private: "Re: Anonymized"

    John Percival wrote:
    > 
    > I'm going to try and throw another issue into this discussion now too:
    > denial of service. We have discussed it for attacking remote servers, but
    > not for the client viewing the image. It's something else that I spotted
    > while I was playing around with this issue just now.
    > 
    > If you have images that include a mailto:meat_private source,
    > then the default handler for mailto: links is opened up. Be that Outlook,
    > Netscape Composer, Eudora, or whatever else you care to use.
    > 
    > So if someone embedded 100 (arbitrary figure) mailto: images in a page, then
    > this would do a lot of harm to the user's computer. At best, it would get
    > very busy for a few minutes creating new emails, and would be a pain to
    > clear up. At worst, it could bring the whole system crashing down.
    
    Netscape 4.77 crashes at about 50 such IMG tags, IF they are different
    (simply putting mailto:fakeluser@fakedomain 100 times won't work (opens
    only 2 message windows)), but if you go with some script... instant
    crash (try it now free of charge at http://msz.pmp.com.pl/boom/ ;-)).
    
    -- 
    I'm an ugly boy            | Nie wchodzic na http://msz.pmp.com.pl/
    My face makes you hurl     | REKLAMY:
    I'm a relation             |    Dla snobow: http://www.filharmonia.pl/
    To Frankenstein's creation | Wypij za mnie: http://www.fws.pl/
    



    This archive was generated by hypermail 2b30 : Sun Jun 24 2001 - 10:02:50 PDT