using hex strings as options

[mmiller at hick.org (mmiller at hick.org)]

Hi Alok,

I've actually run into a similar need for this lately as well, so I'll
look into integrating support for it.  I'll send another response when
it's in SVN.

On Mon, Oct 16, 2006 at 04:28:44PM +0200, Alok Menghrajani wrote:
> Hi,
>
> Let's imagine our exploit hard codes the addresses of LoadLibrary and
> GetProcAddress...
>
>       'Offsets' => {
>               'LOADLIBRARY' => [ 16, 'HEX' ],
>               'GETPROCADDRESS' => [ 33, 'HEX' ],
>       },
>
>       register_options([
>               OptString.new('LOADLIBRARY', [ true,
>                       "Address of LoadLibraryA", "0x7C801D77" ]),
>               OptString.new('GETPROCADDRESS', [ true,
>                       "Address of GetProcAddress", "0x7C80AC28"])
>       ], Msf::Payloads::Singles::Windows::AlokSample)
>
>
> It would be convenient if I could use hex strings in my options (so I
> can easily edit them with the console).So far, the only clean way I have
> found is the following:
>
>       def replace_var(raw, name, offset, pack)
>               if pack == "HEX"
>                       val = datastore[name]
>                       val = val.to_s.hex
>                       val = [ val.to_i ].pack("V")
>                       raw[offset, val.length] = val
>                       return true
>               else
>                       return false
>               end
>       end
>
>
> Is this the right way to do things ? If yes, shouldn't this little piece
> of code be included in the payload.rb file ?
>
> Thanks for your feedback,
> Alok.