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Re: Possibly a stupid question RPC over HTTP
From: "Maxime Ducharme" <mducharme () cybergeneration com>
Date: Wed, 13 Oct 2004 16:15:33 -0400


Hi Daniel & Daniel

I agree this can lead to security holes.

There are ways to make it "more secure" (if you can call
it secure), here are some links about this subject :

(sorry for wrapped urls)

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/rpc/rpc/remote_procedure_calls_using_rpc_over_http.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/rpc/rpc/rpc_over_http_security.asp

http://www.microsoft.com/technet/security/bulletin/MS03-026.mspx
http://www.scripting.com/98/04/stories/bobAtkinsonOnHttpPost.html
http://www.winnetmag.com/MicrosoftExchangeOutlook/Article/ArticleID/40018/MicrosoftExchangeOutlook_40018.html
http://www.sanx.org/tipShow.asp?articleRef=117
http://www.kb.cert.org/vuls/id/698564
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0807
http://searchexchange.techtarget.com/originalContent/0,289142,sid43_gci963557,00.html

Have a nice day

Maxime Ducharme
Programmeur / Spécialiste en sécurité réseau

----- Original Message ----- 
From: "Daniel H. Renner" <dan () losangelescomputerhelp com>
To: <full-disclosure () lists netsys com>
Sent: Wednesday, October 13, 2004 11:37 AM
Subject: Re: [Full-disclosure] Possibly a stupid question RPC over HTTP


Daniel,

Could you please point out where you read this data?  I would like to
see this one...
-- 
Daniel H. Renner <dan () losangelescomputerhelp com>
Los Angeles Computerhelp


On Tue, 2004-10-12 at 20:54, full-disclosure-request () lists netsys com
wrote:
Message: 18
Date: Tue, 12 Oct 2004 12:41:56 -0700
From: "Daniel Sichel" <daniels () Ponderosatel com>
To: <full-disclosure () lists netsys com>
Subject: [Full-disclosure] Possibly a stupid question RPC over HTTP

This may just reflect my ignorance, but I read (and found hard to
believe) that Microsoft has implemented RPC over HTTP. Is this not a
HUGE security hole? If I understand it correctly it means that good old
HTML or XML can invoke a process using standard web traffic (port 80)?
Is there any permission checking done? what things can be invoked by RPC
over HTTP? Jeeze, to me it looks like the barn door is now wide open. Am
I right, and if so, how can I detect RPCs in web traffic to block this
junk? Can ANY stateful packet filter see this stuff or is the pattern
too broad in allowed RPCs?

Again, I hope this is not a stupid question or inappropriate format for
this, as somebody else recently said, there is already enough noise on
this list. I would hate to see this list degenerate, it has been REALLY
valuable to me as a network engineer on occaison.

Thanks all,
Dan Sichel
Ponderosa telephone
daniels () ponderosatel com



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