bugtraq - Shared section vulnerability when opening microsoft office document resulting in DoS

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Date: 27 Jul 2005 07:36:46 -0000
From: sylvain.roger@...ucom.fr
To: bugtraq@...urityfocus.com
Subject: Shared section vulnerability when opening microsoft office
 document resulting in DoS

There is a shared section vulnerability in office products when trying to open
an office document with firefox. For example try to open a word document
attached in a webmail. firefox.exe process will create a son winword.exe
process (it only appears when the process is created with firefox not svchosts). When creating this process a shared section is created called
\BaseNameObjects\Mso97SharedDgXXXXXXXX (the number may change I am not sure at
the present time). The rights on this shared section are put on "everyone" for
delete/synchronise/query/modify. this allows to write arbitrary data and to
perform a Dos against ALL Office open applications.

I do not manage to know if it is a firefox or Microsoft office vulnerability