Re: Patch for the "Microsoft IIS False Content-Length Field DoS Vulnerability" (bid 3667)

From: Ivan Hernandez (ivan.hernandezat_private)
Date: Wed Mar 06 2002 - 10:41:11 PST

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    Your understood is correct. Your patch would solve the problem correctly !
    
    Ivan Hernandez
    
    Bob at firstcodings wrote:
    
    > Hi members,
    >
    >I think no patch has been released at this day.... so, I wrote one myself
    >using ISAPI filters.
    >As I understood RFCs, a hit generated by a "GET" method, does not need the
    >"Content-Length:" header. If this is true, I think my filter is correct.
    >
    >The page is http://bob.firstcodings.com/programs/dropcontentlengthget/
    >(source code is included). For now, please consider this filter as "beta
    >release".
    >I installed this filter on a production server which has an average load :
    >after 2 days and at this point, all is fine. Above all, exploit described in
    >bid 3667 does not work anymore.
    >
    >Thanks to email me at "dropContentLengthGetat_private" for any
    >comments/feedbacks/suggestions about this filter.
    >
    >
    >Bob - firstcodings.
    >P.S : my english may not be correct, sorry :)
    >
    >
    



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