bugtraq - Re: Unchecked Buffer in Opera 7.02

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Date: Thu, 10 Apr 2003 18:12:12 +0900
From: nesumin <nesumin@...thome.net>
To: "David F.Madrid" <conde0@...efonica.net>,
	bugtraq@...urityfocus.com
Subject: Re: Unchecked Buffer in Opera 7.02


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@...thome.net>


-----Original Message-----
From: "David F.Madrid" <conde0@...efonica.net>
Sent: Mon, 7 Apr 2003 22:41:02 -0300 (ART)
To: <bugtraq@...urityfocus.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/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
> 
>