full-disclosure - ***ULTRALAME*** Microsoft Excel Unicode Overflow ***ULTRALAME***

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Message-ID: <44990197.6060409@heapoverflow.com>
Date: Wed Jun 21 09:22:34 2006
From: ad at heapoverflow.com (ad@...poverflow.com)
Subject: ***ULTRALAME*** Microsoft Excel Unicode Overflow
	***ULTRALAME***

me I wonder who's ultralame, kcope or the advisory ? :>


kcope wrote:
> Hello FistFuXXer,
> Very nice that you found that, since unicode overflows are not that 
> easy to exploit.
> I didn't know that Spreadsheet-Perl converted the string into unicode 
> and then put it
> into the file.
> Very nice very nice :o) I like that 0x41414141 :o) weird I didn't even 
> look into the
> hex edit of the xls file.
>
> Best Regards,
>
> kcope
>
>
>
> FistFuXXer wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Hello kcope,
>>
>> the vulnerability that you've found isn't an Unicode-based buffer
>> overflow, Spreadsheet-Perl just converts the string to Unicode and you
>> can edit it later with a hex editor.
>>
>> It's just a simple stack overflow that overwrites the memory after the
>> return address. Until all the write-able stack memory is full and the
>> application tries to overwrite the read-only memory after it, an
>> exception happens. So you won't be able to exploit it by using the
>> return address of the vulnerable 'hlink' function but you can still use
>> the SE handler for exploitation.
>>
>> It looks like Microsoft should release security patches ASAP.
>>
>>
>> Sincerely yours,
>> Manuel Santamarina Suarez
>>   
>
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