#
# This script was written by Renaud Deraison <deraison@cvs.nessus.org>
#
# See the Nessus Scripts License for details
#

if(description)
{
 script_id(10283);
 script_version ("$Revision$");
 script_cve_id("CAN-2000-0138");
 
 name["english"] = "TFN Detect";
 name["francais"] = "Detection de TFN";
 
 script_name(english:name["english"], francais:name["francais"]);
 
 desc["english"] = "
The remote host appears to be running
TFN (Tribe Flood Network), which is
a trojan that can be used to control
your system or make it attack another
network.

It is very likely that this host
has been compromised

Solution : Restore your system from backups,
	   contact CERT and your local
	   authorities

Risk factor : Critical";



 desc["francais"] = "
Le systeme distant semble faire tourner
TFN (Tribe Flood Network) qui peut etre
utilisé pour prendre le controle de celui-ci
ou pour attaquer un autre réseau.

Il est très probable que ce systeme a été
compromis

Solution : reinstallez votre système à partir
	   des sauvegardes, et contactez le CERT
	   et les autorités locales
	   
Facteur de risque : Critique";


 script_description(english:desc["english"], francais:desc["francais"]);
 
 summary["english"] = "Detects the presence of TFN";
 summary["francais"] = "Detecte la présence de TFN";
 
 script_summary(english:summary["english"], francais:summary["francais"]);
 
 script_category(ACT_GATHER_INFO);
 
 
 script_copyright(english:"This script is Copyright (C) 1999 Renaud Deraison",
		francais:"Ce script est Copyright (C) 1999 Renaud Deraison");
 family["english"] = "Backdoors";
 family["francais"] = "Backdoors";
 script_family(english:family["english"], francais:family["francais"]);

 
 exit(0);
}

#
# The script code starts here
#

if(islocalhost())exit(0);

ip = forge_ip_packet(ip_hl:5, ip_v:4,   ip_off:0,
                     ip_id:9, ip_tos:0, ip_p : IPPROTO_ICMP,
                     ip_len : 20, ip_src : this_host(),
                     ip_ttl : 255);

#
# We send the command ID_SYNPORT (678) and wait for 
# ID_ACK (123)
#

ID_ACK = 123;
ID_SYNPORT = 678;
icmp = forge_icmp_packet(ip:ip,icmp_type : 8, icmp_code:0,
                          icmp_seq : 1, icmp_id : ID_SYNPORT, 
			  data:"1234");

filter = string("icmp and src host ", get_host_ip(), " and dst host ", this_host());
r = send_packet(icmp, pcap_active:TRUE, pcap_filter:filter);
if(r)
{
 type = get_icmp_element(icmp:r, element:"icmp_id");
 if(type == ID_ACK)security_hole(protocol:"icmp",port:0); 
}