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RE: Possibly a stupid question RPC over HTTP
From: "winter" <mail_winter () hotpop com>
Date: Thu, 14 Oct 2004 09:24:31 +1000

I recall Todd from bindview talking about this in one of his
advisories...that it was possible in IIS, but had to be explicitly switched
on. And also in one of the blackhat (rm) archive methinks.


-----Original Message-----
From: full-disclosure-admin () lists netsys com 
[mailto:full-disclosure-admin () lists netsys com] On Behalf Of 
Rodrigo Barbosa
Sent: Thursday, 14 October 2004 6:05 AM
To: full-disclosure () lists netsys com
Subject: Re: [Full-disclosure] Possibly a stupid question RPC 
over HTTP

Hash: SHA1

This is called, in my experience, XML-RPC (google search with lots
of results). Reference: http://www.xmlrpc.com/spec

Yes, it is a Remote Procedure Calling implementation. No, it is not
the same things that the good old udp based RPC used for things
like NIS and NFS. References: RFC 1057 and RFC 1831.

That can be the source of confusion. Akin names.

On Wed, Oct 13, 2004 at 11:37:12AM -0400, Daniel H. Renner wrote:

Could you please point out where you read this data?  I 
would like to
see this one...
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.

- -- 
Rodrigo Barbosa <rodrigob () suespammers org>
"Quid quid Latine dictum sit, altum viditur"
"Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)

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