Allows the HTTP Set-Cookie parser to handle a trailing semicolon. Fixes #731

CHANGELOG

@@ -1,5 +1,8 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o [NSE][GH#731] NSE is now able to process HTTP responses with a Set-Cookie
+  header that has an extraneous trailing semicolon. [nnposter]
+
 o [Nsock] Handle any and all socket connect errors the same: raise as an Nsock
   error instead of fatal. This prevents Nmap and Ncat from quitting with
   "Strange error from connect:" [Daniel Miller]

nselib/http.lua

@@ -762,6 +762,9 @@ parse_set_cookie = function (s)
   while s:sub(pos, pos) == ";" do
     pos = pos + 1
     pos = skip_space(s, pos)
+    if pos > #s then
+      break
+    end
     pos, name = get_token(s, pos)
     if not name then
       return nil, string.format("Can't get attribute name of cookie \"%s\".", cookie.name)