Fix AXFR false positive bug

git-svn-id: file:///home/svn/framework3/trunk@7441 4d416f70-5f16-0410-b530-b9f4589650da

modules/auxiliary/gather/dns_enum.rb

@@ -312,8 +312,10 @@ class Metasploit3 < Msf::Auxiliary
 		if (query.answer.length != 0)
 			(query.answer.select { |i| i.class == Net::DNS::RR::NS}).each do |nsrcd|
 				print_status("Testing Nameserver: #{nsrcd.nsdname}")
-				@res.nameserver=(nsrcd.nsdname)
-					begin
+				nssrvquery = @res.query(nsrcd.nsdname, "A")
+				nssrvip = nssrvquery.answer[0].address.to_s
+				@res.nameserver=(nssrvip)
+				zone = []
 				zone = @res.query(target,Net::DNS::AXFR)
 				if zone.answer.length != 0
 					namesrvips = @res.query(nsrcd.nsdname,"A")
@@ -395,9 +397,6 @@ class Metasploit3 < Msf::Auxiliary
 				else
 					print_status("Zone Transfer Failed")
 				end
-					rescue
-						print_status("Zone Transfer Failed")
-					end
 				end
 		else
 			print_error("Could not resolve domain #{target}")