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- #
- # This script was written by Renaud Deraison <deraison@cvs.nessus.org>
- #
- # See the Nessus Scripts License for details
- #
-
- if(description)
- {
- script_id(11002);
-
- script_version ("$Revision: 1.6 $");
- name["english"] = "DNS Server Detection";
- script_name(english:name["english"]);
-
- desc["english"] = "
- A DNS server is running on this port. If you do not use it, disable it.
-
- Risk factor : Low";
-
-
-
- script_description(english:desc["english"]);
-
- summary["english"] = "detects a running name server";
- script_summary(english:summary["english"]);
-
- script_category(ACT_GATHER_INFO);
-
- script_copyright(english:"This script is Copyright (C) 2003 Renaud Deraison");
- family["english"] = "General";
- script_family(english:family["english"]);
-
- exit(0);
- }
-
- #
- # We ask the nameserver to resolve 127.0.0.1
- #
-
- include("misc_func.inc");
-
- req = raw_string(0x4C, 0x55, 0x01, 0x00, 0x00, 0x01,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x31,
- 0x01, 0x30, 0x01, 0x30, 0x03, 0x31, 0x32, 0x37,
- 0x07, 0x49, 0x4E, 0x2D, 0x41, 0x44, 0x44, 0x52,
- 0x04, 0x41, 0x52, 0x50, 0x41, 0x00, 0x00, 0x0C,
- 0x00, 0x01);
-
-
- if(get_udp_port_state(53))
- {
- soc = open_sock_udp(53);
- send(socket:soc, data:req);
- r = recv(socket:soc, length:1024);
- if(strlen(r) > 3)
- {
- flags = ord(r[2]);
- if(flags & 0x80){
- security_note(port:53, protocol:"udp");
- set_kb_item(name:"DNS/udp/53", value:TRUE);
- }
- }
- }
-
-
- if(get_port_state(53))
- {
- soc = open_sock_tcp(53);
- if(!soc)exit(0);
- len = strlen(req);
- len_hi = len / 256;
- len_lo = len % 256;
- req = string(raw_string(len_hi, len_lo), req);
- send(socket:soc, data:req);
- r = recv(socket:soc, length:2, min:2);
- if ( ! r ) exit(0);
- len = ord(r[0]) * 256 + ord(r[1]);
- if ( len > 128 ) len = 128;
- r = strcat(r, recv(socket:soc, length:len, min:len));
- if(strlen(r) > 5)
- {
- flags = ord(r[4]);
- if(flags & 0x80){
- security_note(53);
- register_service(port: 53, proto: "dns");
- }
- }
- }
-
-
-