[29691] in bugtraq
Unchecked Buffer in Opera 7.02
daemon@ATHENA.MIT.EDU (David F.Madrid)
Tue Apr 8 11:22:29 2003
Message-ID: <47969.80.58.4.235.1049766062.squirrel@www.vsantivirus.com>
Date: Mon, 7 Apr 2003 22:41:02 -0300 (ART)
From: "David F.Madrid" <conde0@telefonica.net>
To: <bugtraq@securityfocus.com>
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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
