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- #
- # This script was written by Vincent Renardias <vincent@strongholdnet.com>
- #
- # See the Nessus Scripts License for details
- #
- #T
-
- if(description)
- {
- script_id(11367);
- script_version ("$Revision: 1.2 $");
- script_cve_id("CAN-1999-0636");
- name["english"] = "Discard port open";
- name["francais"] = "Port 'discard' ouvert";
- script_name(english:name["english"], francais:name["francais"]);
-
- desc["english"] = "
- The remote host is running a 'discard' service. This service
- typically sets up a listening socket and will ignore all the
- data which it receives.
-
- This service is unused these days, so it is advised that you
- disable it.
-
-
- Solution :
-
- - Under Unix systems, comment out the 'discard' line in /etc/inetd.conf
- and restart the inetd process
-
- - Under Windows systems, set the following registry key to 0 :
- HKLM\System\CurrentControlSet\Services\SimpTCP\Parameters\EnableTcpDiscard
-
- Then launch cmd.exe and type :
-
- net stop simptcp
- net start simptcp
-
- To restart the service.
-
-
- Risk factor : Low";
-
- script_description(english:desc["english"]);
-
- summary["english"] = "Checks if the 'discard' port is open";
- summary["francais"] = "VΘrifie si le port 'discard' est ouvert";
-
- script_summary(english:summary["english"], francais:summary["francais"]);
-
- script_category(ACT_GATHER_INFO);
-
- script_copyright(english:"This script is Copyright (C) 2003 StrongHoldNet",
- francais:"Ce script est Copyright (C) 2003 StrongHoldNet",
- deutsch:"Dieses Skript ist Copyright geschⁿtzt. (C) 2003 StrongHoldNet");
-
- family["english"] = "Useless services";
- family["francais"] = "Services inutiles";
- family["deutsch"] = "Nutzlose Dienste";
-
- script_family(english:family["english"], francais:family["francais"], deutsch:family["deutsch"]);
- script_dependencie("find_service.nes");
- script_require_ports(9);
-
- exit(0);
- }
-
- #
- # The script code starts here
- #
-
- include("misc_func.inc");
-
- port = 9; # Discard is not supposed to run on any other port.
- if(known_service(port)) { exit(0); }
-
- # We send between 17 and 210 bytes of random data.
- # If the service is still listening without any output, we assume
- # that 9/tcp is running 'discard'.
- function check_discard(soc) {
- local_var i, n, res;
- if(!soc)
- return(0);
-
- n = send(socket:soc, data:string(crap(length:(rand()%193+17), data:string(rand())),"\r\n\r\n"));
- if (n<0)
- return(0);
-
- res = recv(socket:soc, length:1024, timeout:5);
- if(strlen(res) > 0)
- return(0);
-
- return(1);
- }
-
- if(get_port_state(port))
- {
- soc = open_sock_tcp(port);
- if(check_discard(soc)) {
- security_warning(port);
- register_service(port:port,proto:"discard");
- if(soc)
- close(soc);
- }
- }
-
- exit(0);
-