Nagios < 3.3.1 'expand' Parameter XSS Vulnerability - Active Check

# SPDX-FileCopyrightText: 2011 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:nagios:nagios";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.801894");
  script_version("2025-09-11T05:38:37+0000");
  script_tag(name:"last_modification", value:"2025-09-11 05:38:37 +0000 (Thu, 11 Sep 2025)");
  script_tag(name:"creation_date", value:"2011-06-07 13:29:28 +0200 (Tue, 07 Jun 2011)");
  script_cve_id("CVE-2011-2179");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:N");

  script_name("Nagios < 3.3.1 'expand' Parameter XSS Vulnerability - Active Check");

  script_xref(name:"URL", value:"http://tracker.nagios.org/view.php?id=224");
  script_xref(name:"URL", value:"http://www.securityfocus.com/archive/1/518221");
  script_xref(name:"URL", value:"http://seclists.org/fulldisclosure/2011/Jun/22");
  script_xref(name:"URL", value:"http://packetstormsecurity.org/files/view/101899/SSCHADV2011-006.txt");

  script_tag(name:"qod_type", value:"remote_analysis");

  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2011 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_nagios_http_detect.nasl");
  script_require_ports("Services/www", 80);
  script_mandatory_keys("nagios/http/detected");

  script_tag(name:"impact", value:"Successful exploitation will allow attacker to execute arbitrary
  HTML and script code in a user's browser session in the context of an affected site.");

  script_tag(name:"affected", value:"Nagios versions 3.2.3 and prior.");

  script_tag(name:"insight", value:"The flaw is caused by improper validation of user-supplied input
  passed via the 'expand' parameter in cgi-bin/config.cgi, which allows attackers to execute
  arbitrary HTML and script code on the web server.");

  script_tag(name:"solution", value:"Update to version 3.3.1 or later.");

  script_tag(name:"summary", value:"Nagios is prone to a cross-site scripting (XSS) vulnerability.");

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


  exit(0);
}

include("http_func.inc");
include("http_keepalive.inc");
include("host_details.inc");

if (!port = get_app_port(cpe:CPE, service:"www"))
  exit(0);

if (!dir = get_app_location(cpe: CPE, port: port))
  exit(0);

if (dir == "/")
  dir = "";

url = dir + "/cgi-bin/config.cgi?type=command&expand=<script>" +
            "alert(String.fromCharCode(88,83,83))</script>";

if (http_vuln_check(port:port, url:url, check_header: TRUE,
                    pattern:"><script>alert\(String.fromCharCode\(88,83,83\)\)</script>")) {
  report = http_report_vuln_url(port: port, url: url);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);