bugtraq - Re: IE / Outlook / MS SHLWAPI Render

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <003701c30997$6d3cd200$0100a8c0@grotedoos>
Date: Wed, 23 Apr 2003 14:54:06 +0200
From: "Berend-Jan Wever" <SkyLined@...p.tudelft.nl>
To: <bugtraq@...urityfocus.com>
Subject: Re: IE / Outlook / MS SHLWAPI Render - more trivial crash

Technical details:

IE tries to compare the type of the input field to "HIDDEN", to see if it
should be rendered. When there is no type string, a null-pointer is used.

mshtml.dll calls shlwapi.dll#158 @ 0x636f0037 with a pointer to a static
unicode string "HIDDEN" and a null-pointer.
shlwapi.dll#158 does a case-insensitive comparison of two unicode strings:
it reads from address 0x0 because of the null-pointer and thus causes an
exception.
This is not exploitable, other then a DoS because there is no memory mapped
@ 0x0 and even if you could load something there, you could only compare it
to "HIDDEN" which gets you nowhere.

Berend-Jan Wever

----- Original Message -----
From: "Gervaize Maquard" <freestyler@...cali.fr>
To: <bugtraq@...urityfocus.com>
Sent: Tuesday, April 22, 2003 22:29
Subject: RE : IE / Outlook / MS SHLWAPI Render - more trivial crash

> Original message :
>
> >Hola:
> >Well, as it seems that is the Microsoft Crash mounth, let see another
> one:
> >---------------------------------
> ><html>
> ><form>
> ><input type crash>
> ></form>
> ></html>
> >---------------------------------
> >This will crash IE with the following error:
> >"Unhandled exception in iexplore.exe (SHLWAPI.DLL): 0xC0000005: Access
> >Violation"
> >It's a null pointer overwrite, so it's not easly exploitable...
>
> >This HTML also crash Outlook, Frontpage, and all the Microsoft programs
> that >use the shlwapi.dll library to render web code.
> >Plain HTML is a dangerous language :)
>
> Added :
>
> It also seems to crash explorer.exe when the .html file containing the
> code is copied into any folder !!
> It may work since windows is trying to create a view in Windows
> explorer. Indeed, it doesn't work when the file is copied in the
> desktop.
>
> Tested on Windows XP with Office XP.
>