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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(10262);
- script_bugtraq_id(6118, 7580, 8196);
- script_version ("$Revision: 1.32 $");
- script_cve_id("CAN-1999-0512", "CAN-2002-1278", "CAN-2003-0285");
- name["english"] = "Mail relaying";
- name["francais"] = "Relais de mail";
- script_name(english:name["english"],
- francais:name["francais"]);
-
- desc["english"] = "
- The remote SMTP server seems to allow the relaying. This means that
- it allows spammers to use your mail server to send their mails to
- the world, thus wasting your network bandwidth.
-
- Risk factor : Low / Medium
-
- Solution : configure your SMTP server so that it can't be used as a relay
- any more.";
-
-
- desc["francais"] = "
- Le serveur SMTP distant semble permettre le relaying. C'est α dire
- qu'il permet aux spammeurs de l'utiliser pour envoyer leurs mails au monde
- entier, gachant ainsi votre bande passante.
-
- Facteur de risque : Faible/Moyen
-
- Solution : Reconfigurez votre serveur SMTP afin qu'il ne puisse plus etre
- utilisΘ comme relay.";
-
-
- script_description(english:desc["english"],
- francais:desc["francais"]);
-
-
- summary["english"] = "Checks if the remote mail server can be used as a spam relay";
- summary["francais"] = "VΘrifie si le serveur de mail distant peut etre utilisΘ comme relais de spam";
- 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"] = "SMTP problems";
- family["francais"] = "ProblΦmes SMTP";
- script_family(english:family["english"], francais:family["francais"]);
- script_dependencie("find_service.nes", "sendmail_expn.nasl",
- "smtp_settings.nasl");
- script_exclude_keys("SMTP/wrapped", "SMTP/qmail");
- script_require_ports("Services/smtp", 25);
- exit(0);
- }
-
- #
- # The script code starts here
- #
-
- include("smtp_func.inc");
-
-
- function smtp_test_relay(tryauth)
- {
- soc = open_sock_tcp(port);
- if(!soc)exit(0);
- data = smtp_recv_banner(socket:soc);
- domain = get_kb_item("Settings/third_party_domain");
-
- crp = string("HELO ", domain, "\r\n");
- send(socket:soc, data:crp);
- data = recv_line(socket:soc, length:1024);
- if(!ereg(pattern:"^[2-3][0-9][0-9] .*", string:data)) return(0);
-
- if(tryauth)
- {
- crp = string("AUTH CRAM-MD5\r\n");
- send(socket:soc, data:crp);
- data = recv_line(socket:soc, length:1024);
- if(!ereg(pattern:"^[2-3][0-9][0-9] .*", string:data)) return(0);
-
- crp = string("ZnJlZCA5ZTk1YWVlMDljNDBhZjJiODRhMGMyYjNiYmFlNzg2Z==\r\n");
- send(socket:soc, data:crp);
- data = recv_line(socket:soc, length:1024);
- if(!ereg(pattern:"^[2-3][0-9][0-9] .*", string:data)) return(0);
- }
-
- crp = string("MAIL FROM: <test_1@", domain, ">\r\n");
- send(socket:soc, data:crp);
- data = recv_line(socket:soc, length:1024);
- if(!ereg(pattern:"^[2-3][0-9][0-9] .*", string:data)) return(0);
-
- crp = string("RCPT TO: <test_2@", domain, ">\r\n");
- send(socket:soc, data:crp);
- i = recv_line(socket:soc, length:1024);
- if(ereg(pattern:"^250 ", string:i))
- {
- send(socket:soc, data:string("DATA\r\n"));
- r = recv_line(socket:soc, length:1024);
- if(ereg(pattern:"^[2-3][0-9][0-9] .*", string:r))
- {
- security_warning(port);
- set_kb_item(name:"SMTP/spam", value:TRUE);
- set_kb_item(name:"SMTP/" + port + "/spam", value:TRUE);
- }
- }
- close(soc);
- }
-
- # can't perform this test on localhost
- if(islocalhost())exit(0);
-
- # can't perform this test on the local net
- #if(islocalnet())exit(0);
-
- port = get_kb_item("Services/smtp");
- if(!port)port = 25;
- if(get_port_state(port))
- {
- smtp_test_relay(tryauth: 0);
- smtp_test_relay(tryauth: 1);
- }
-