Django Forms Library Algorithmic Complexity Vulnerability

# SPDX-FileCopyrightText: 2009 Greenbone AG
# 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

CPE = "cpe:/a:djangoproject:django";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.900882");
  script_version("2025-03-05T05:38:52+0000");
  script_tag(name:"last_modification", value:"2025-03-05 05:38:52 +0000 (Wed, 05 Mar 2025)");
  script_tag(name:"creation_date", value:"2009-10-29 07:53:15 +0100 (Thu, 29 Oct 2009)");
  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_cve_id("CVE-2009-3695");
  script_name("Django Forms Library Algorithmic Complexity Vulnerability");
  script_xref(name:"URL", value:"http://secunia.com/advisories/36948/");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/36655");
  script_xref(name:"URL", value:"http://www.vupen.com/english/advisories/2009/2871");
  script_xref(name:"URL", value:"http://www.djangoproject.com/weblog/2009/oct/09/security/");

  script_tag(name:"qod_type", value:"executable_version");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2009 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_django_detect_lin.nasl");
  script_mandatory_keys("Django/Linux/Ver");

  script_tag(name:"impact", value:"Successful exploitation will allow attacker to cause a Denial of Service
  due to high CPU consumption via specially crafted email addresses or URLs.");

  script_tag(name:"affected", value:"Django version prior to 1.0 before 1.0.4 and 1.1 before 1.1.1.");

  script_tag(name:"insight", value:"The flaw is due to an error within the regular expressions used for
  validation of the 'EmailField' or 'URLField' form fields in Django's forms library.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"solution", value:"Upgrade to Django version 1.0.4 or 1.1.1 or later.");

  script_tag(name:"summary", value:"Django is prone to Algorithmic Complexity vulnerability.");

  exit(0);
}

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

djangoVer = get_app_version(cpe: CPE);

if(djangoVer)
{
  if(version_in_range(version:djangoVer, test_version:"1.0", test_version2:"1.0.3")||
     version_is_equal(version:djangoVer, test_version:"1.1")){
    security_message(port:0);
  }
}