Apache HTTP Server 'mod_proxy_ftp' Module DoS Vulnerability

# Copyright (C) 2009 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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.

CPE = "cpe:/a:apache:http_server";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.900841");
  script_version("2022-05-09T13:48:18+0000");
  script_tag(name:"last_modification", value:"2022-05-09 13:48:18 +0000 (Mon, 09 May 2022)");
  script_tag(name:"creation_date", value:"2009-09-16 15:34:19 +0200 (Wed, 16 Sep 2009)");
  script_tag(name:"cvss_base", value:"2.6");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:N/I:N/A:P");
  script_tag(name:"qod_type", value:"remote_banner_unreliable");
  script_cve_id("CVE-2009-3094");
  script_name("Apache HTTP Server 'mod_proxy_ftp' Module DoS Vulnerability");
  script_xref(name:"URL", value:"http://intevydis.com/vd-list.shtml");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/36260");
  script_xref(name:"URL", value:"http://www.intevydis.com/blog/?p=59");
  script_xref(name:"URL", value:"http://secunia.com/advisories/36549");
  script_xref(name:"URL", value:"https://httpd.apache.org/security/vulnerabilities_22.html");
  script_xref(name:"URL", value:"https://httpd.apache.org/security/vulnerabilities_20.html");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2009 Greenbone Networks GmbH");
  script_family("Denial of Service");
  script_dependencies("gb_apache_http_server_consolidation.nasl");
  script_mandatory_keys("apache/http_server/detected");

  script_tag(name:"impact", value:"Successful exploitation could allow remote attackers to
  cause a Denial of Service (DoS) in the context of the affected application.");

  script_tag(name:"affected", value:"Apache HTTP Server version 2.0.x through 2.0.63
  and 2.2.x through 2.2.13 running mod_proxy.");

  script_tag(name:"insight", value:"The flaw is due to an error in 'ap_proxy_ftp_handler'
  function in modules/proxy/proxy_ftp.c in the mod_proxy_ftp module while processing
  responses received from FTP servers. This can be exploited to trigger a NULL-pointer
  dereference and crash an Apache child process via a malformed EPSV response.");

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

  script_tag(name:"solution", value:"Update to Apache HTTP Server version 2.0.64, 2.2.14
  or later.");

  script_tag(name:"summary", value:"Apache HTTP Server is prone to a Denial of Service
  vulnerability.");

  exit(0);
}

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

if(isnull(port = get_app_port(cpe:CPE)))
  exit(0);

if(!infos = get_app_version_and_location(cpe:CPE, port:port, exit_no_version:TRUE, version_regex:"^[0-9]+\.[0-9]+\.[0-9]+"))
  exit(0);

vers = infos["version"];
path = infos["location"];

if(version_in_range(version:vers, test_version:"2.0.0", test_version2:"2.0.63") ||
   version_in_range(version:vers, test_version:"2.2.0", test_version2:"2.2.13")) {
  report = report_fixed_ver(installed_version:vers, fixed_version:"2.0.64 / 2.2.14", install_path:path);
  security_message(port:port, data:report);
  exit(0);
}

exit(99);