Re: shellcode with standard characters

[Jose Ronnick <matrix () phiral com>]

On Thu, 12 Jun 2003 11:20:00 +0200
JohnnyRun <gianni79 () gamebox net> wrote:

> Hi!
> This is my first post and I'm looking for some documentation.
> A friend of mine has produced a segfault with malloc vulnerability on an
> application.
> We would like to produce something more interesting.
> The field overflowed can accept only characters between 0 and 128. Any
> other character is replaced with a whitespace.
>
> Can we inject shellcode with only this characters avaible?
> Can you suggest me documentation about shellcode writing?

Several months I wrote a tool called dissembler, which can convert an existing piece of shellcode into printable ASCII 
shellcode.. this should help you with your exploitation...

http://www.phiral.com/research/dissembler.html

Hope this helps..

-- 
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