nginx Proxy DNS Cache Domain Spoofing Vulnerability

###############################################################################
# OpenVAS Vulnerability Test
# $Id: nginx_36438.nasl 5002 2017-01-13 10:17:13Z teissa $
#
# nginx Proxy DNS Cache Domain Spoofing Vulnerability
#
# Authors:
# Michael Meyer
#
# Copyright:
# Copyright (c) 2009 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 'nginx' program is prone to a vulnerability that may allow
attackers to spoof domains because the software fails to properly
compare domains when referencing an internal DNS cache.

This issue can be exploited when nginx is configured to act as a
forward proxy, but this is a nonstandard and unsupported
configuration. Attacks against other configurations may also be
possible.

Successful exploits may allow remote attackers to intercept traffic
intended for legitimate websites, which may aid in further attacks.";


if (description)
{
 script_id(100277);
 script_version("$Revision: 5002 $");
 script_tag(name:"last_modification", value:"$Date: 2017-01-13 11:17:13 +0100 (Fri, 13 Jan 2017) $");
 script_tag(name:"creation_date", value:"2009-10-01 18:57:31 +0200 (Thu, 01 Oct 2009)");
 script_bugtraq_id(36438);
 script_tag(name:"cvss_base", value:"5.0");
 script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:N/A:N");

 script_name("nginx Proxy DNS Cache Domain Spoofing Vulnerability");

 script_xref(name : "URL" , value : "http://www.securityfocus.com/bid/36438");
 script_xref(name : "URL" , value : "http://nginx.net/");
 script_xref(name : "URL" , value : "http://www.securityfocus.com/archive/1/506541");
 script_xref(name : "URL" , value : "http://www.securityfocus.com/archive/1/506543");

 script_tag(name:"qod_type", value:"remote_banner");
 script_category(ACT_GATHER_INFO);
 script_family("Web Servers");
 script_copyright("This script is Copyright (C) 2009 Greenbone Networks GmbH");
 script_dependencies("nginx_detect.nasl");
 script_require_ports("Services/www", 80);
 script_mandatory_keys("nginx/installed");
 script_tag(name : "summary" , value : tag_summary);
 exit(0);
}

include("http_func.inc");
include("version_func.inc");

port = get_http_port(default:80);
if(!get_port_state(port))exit(0);

if(!vers = get_kb_item(string("nginx/", port, "/version")))exit(0);
if(!isnull(vers) && vers >!< "unknown") {

  if(
      version_in_range(version:vers, test_version:"0.8", test_version2:"0.8.15") ||
      version_in_range(version:vers, test_version:"0.7", test_version2:"0.7.62") || 
      version_in_range(version:vers, test_version:"0.6", test_version2:"0.6.39") ||
      version_in_range(version:vers, test_version:"0.5", test_version2:"0.5.38") 
    ) {
      security_message(port:port);
      exit(0);
  }

}

exit(0);