RE: TRACE used to increase the dangerous of XSS.

So how do you propose fixing this issue?

My solution is to remove TRACE support from XMLHTTP.

Richard

-----Original Message-----

From: Thor Larholm [mailto:thor@pivx.com] Sent: Thursday, January 23, 2003 4:33 AM To: Richard M. Smith; bugtraq@securityfocus.com; webappsec@securityfocus.com; vulnwatch@vulnwatch.org Subject: RE: TRACE used to increase the dangerous of XSS.

This is not a bug in IE or XMLHTTP, and the cookie is not returned as part
of the HTTP response headers. It is returned as part of the HTTP response
body, which is exactly how TRACE works. Manipulating the HTTP response body
returned is the last thing XMLHTTP would, or should, do.

IE is not the only browser that has XMLHTTP, Mozilla implemented a fullyworking copy with the exact same behavior. Neither remove any Set-Cookie HTTP headers from the response exposed to scripting.

Regards
Thor Larholm
PivX Solutions, LLC - Senior Security Researcher

Latest PivX research: Multi-vendor Game Server DDoS Vulnerability http://www.pivx.com/press_releases/mk_mk001.html

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-----Original Message-----

From: Richard M. Smith [mailto:rms@computerbytesman.com] Sent: 22. januar 2003 23:35
To: bugtraq@securityfocus.com; webappsec@securityfocus.com; vulnwatch@vulnwatch.org
Subject: RE: TRACE used to increase the dangerous of XSS.

Isn't this a bug in Internet Explorer? Shouldn't the Microsoft XMLHTTP ActiveX control be removing cookies from returned HTTP headers when a HTTP TRACE is done? I know that this already happens when a GET or a POST is done with XMLHTTP.

Richard M. Smith
http://www.ComputerBytesMan.com Received on Thu Jan 23 10:39:53 2003