ircd-ratbox 'HELP' Command Denial Of Service Vulnerability

###############################################################################
# OpenVAS Vulnerability Test
# $Id: ircd_ratbox_37979.nasl 5394 2017-02-22 09:22:42Z teissa $
#
# ircd-ratbox 'HELP' Command Denial Of Service Vulnerability
#
# Authors:
# Michael Meyer
#
# Copyright:
# Copyright (c) 2010 Greenbone Networks GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
###############################################################################

tag_summary = "The 'ircd-ratbox' daemon is prone to a denial-of-service
vulnerability.

Attackers can exploit this issue to deny service to legitimate users.

This issue affects ircd-ratbox 2.2.8; other versions may also
be affected.";

tag_solution = "Updates are available. Please see the references for details.";

if (description)
{
 script_id(100471);
 script_version("$Revision: 5394 $");
 script_tag(name:"last_modification", value:"$Date: 2017-02-22 10:22:42 +0100 (Wed, 22 Feb 2017) $");
 script_tag(name:"creation_date", value:"2010-01-28 18:48:47 +0100 (Thu, 28 Jan 2010)");
 script_bugtraq_id(37979);
 script_cve_id("CVE-2010-0300");
 script_tag(name:"cvss_base", value:"5.0");
 script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");

 script_name("ircd-ratbox 'HELP' Command Denial Of Service Vulnerability");

 script_xref(name : "URL" , value : "http://www.securityfocus.com/bid/37979");
 script_xref(name : "URL" , value : "http://www.ircd-ratbox.org/");

 script_tag(name:"qod_type", value:"remote_banner");
 script_category(ACT_GATHER_INFO);
 script_family("Denial of Service");
 script_copyright("This script is Copyright (C) 2010 Greenbone Networks GmbH");
 script_dependencies("ircd.nasl");
 script_require_ports("Services/irc", 6667);
 script_tag(name : "solution" , value : tag_solution);
 script_tag(name : "summary" , value : tag_summary);
 exit(0);
}

include("version_func.inc");

port = get_kb_item("Services/irc");
if(!port)port = 6667;
if(! get_port_state(port)) exit(0);

banner = get_kb_item(string("irc/banner/", port));
if(!banner)exit(0);
if("ratbox" >!< banner)exit(0);

version = eregmatch(pattern:"ircd-ratbox-([0-9.]+)", string: banner);
if(isnull(version[1]))exit(0);

if(version_is_less_equal(version: version[1], test_version: "2.2.8")) {
  security_message(port:port);
  exit(0);
}