full-disclosure - Unchecked Buffer in Opera 7.02

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Message-ID: <20030408094913.6df11884.vdongen@hetisw.nl>
From: vdongen at hetisw.nl (I.R.van Dongen)
Subject: Unchecked Buffer in Opera 7.02

Opera 6.11 (Linux does not seem to be affected.

ntentas descargar este archivo desde una p?gina gratuita de usuario de Tripod :
http://usuarios.lycos.es/idoru/aaAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.zip

Para acceder a este archivo, necesitas visitar la p?gina del usuario:
http://usuarios.lycos.es/idoru
(ser?s remitido autom?ticamente a Lycos Tripod Espa?a en 5 segundos)

My spanish isn't that good, but it seems I get a nice 404 page.


Greetings,

Ivo van Dongen

On Mon, 7 Apr 2003 22:39:26 -0300 (ART)
"David F.Madrid" <conde0@...efonica.net> wrote:

> 
> Tested version : Opera 7.02 Build 2668
> 
> Vendor Status : Vendor was contacted on 8-4-2003
> 
> Description :
> 
> Opera web browser has an unchecked buffer in his code that allow a
> malicious website to crash it and in certain circumstances , execute code
> with user priviliges .
> 
> To reproduce the bug open this link
> 
> http://usuarios.lycos.es/idoru/aaAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.zip
> 
> Opera crashes with an access violation . Instruction pointer EIP is
> overwritten by the file name converted to unicode . That makes only
> possible to reference certain addresses in memory to execute . To place
> your code to execute in a valid address you have to assign it to an
> enviroment variable .That place your code in an address that can be
> referenced by EIP ( ~00010040 )
> 
> 
> -- 
> 
> Regards ,
> 
> David F.Madrid
> Madrid , Spain
> 
> 
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.netsys.com/full-disclosure-charter.html
>