Re: Unchecked Buffer in Opera 7.02

["I.R.van Dongen" <vdongen () hetisw nl>]

Opera 6.11 (Linux does not seem to be affected.

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

Para acceder a este archivo, necesitas visitar la página del usuario:
http://usuarios.lycos.es/idoru
(serás remitido automáticamente a Lycos Tripod España 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 () telefonica 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
>
>
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