Onderwerp: Unchecked Buffer in Opera 7.02

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/aaAAA...AAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA.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

Hello,

I think it is known issue.

>> http://www.securityfocus.com/bid/7056

And vendor has already released "Opera 7.03 Build 2670".
They said that it is fixed-version for that issue.


Regards.

--------------------------------------------------
nesumin <nesumin@softhome.net>


-----Original Message-----
From: "David F.Madrid" <conde0@telefonica.net>
Sent: Mon, 7 Apr 2003 22:41:02 -0300 (ART)
To: <bugtraq@securityfocus.com>
Subject: Unchecked Buffer in Opera 7.02


> 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/aaAAA...AAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAA
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA.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
>
>