[framework] using hex strings as options

[Alok Menghrajani]

Thanks for the quick fix !

Alok.


mmiller at hick.org wrote:
> Committed support to do this for all payloads.  Basically, the way you
> should handle this is by passing 'V' as the pack type instead of 'HEX'.
> It will automatically detect that the values you passed in are hex
> strings and convert them as necessary.
> 
> Data can be specified in the following formats:
> 
> 0x12345678
> \x78\x56\x34\x12
> 
> Let us know if you run into problems.
> 
> 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.