Format string on HTTP method name

# SPDX-FileCopyrightText: 2003 Michel Arboi
# 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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.11801");
  script_version("2023-07-21T05:05:22+0000");
  script_tag(name:"last_modification", value:"2023-07-21 05:05:22 +0000 (Fri, 21 Jul 2023)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"6.9");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:M/Au:N/C:C/I:C/A:C");
  script_name("Format string on HTTP method name");
  script_category(ACT_DESTRUCTIVE_ATTACK);
  script_copyright("Copyright (C) 2003 Michel Arboi");
  script_family("Gain a shell remotely");
  script_dependencies("find_service.nasl", "httpver.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_tag(name:"solution", value:"Upgrade your software or contact your vendor and inform him
  of this vulnerability.");

  script_tag(name:"summary", value:"The remote web server seems to be vulnerable to a format string attack
  on the method name.");

  script_tag(name:"impact", value:"An attacker might use this flaw to make it crash or even execute
  arbitrary code on this host.");

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

  exit(0);
}

include("http_func.inc");
include("port_service_func.inc");
include("misc_func.inc");

port = http_get_port(default:80);
if(http_is_dead(port:port))
  exit(0);

req = http_get(item: strcat("/vt-test", rand_str(), ".html"), port: port);
soc = http_open_socket(port);
if(!soc)
  exit(0);

send(socket: soc, data: req);
r = http_recv(socket: soc);
http_close_socket(soc);
if(!r)
  exit(0);

flag = 0;
flag2 = 0;

if(egrep(pattern:"[0-9a-fA-F]{8}", string:r))
  flag = 1;

foreach bad(make_list("%08x", "%s", "%#0123456x%08x%x%s%p%n%d%o%u%c%h%l%q%j%z%Z%t%i%e%g%f%a%C%S%08x%%#0123456x%%x%%s%%p%%n%%d%%o%%u%%c%%h%%l%%q%%j%%z%%Z%%t%%i%%e%%g%%f%%a%%C%%S%%08x")) {

  soc = http_open_socket(port);
  if(!soc)
    continue;

  req2 = ereg_replace(string:req, pattern:"^GET", replace:bad);
  send(socket:soc, data:req2);
  r = http_recv(socket:soc);
  http_close_socket(soc);
  if(egrep(pattern:"[0-9a-fA-F]{8}", string:r)) {
    flag2++;
  }
}

if(http_is_dead(port:port)) {
  security_message(port:port);
  exit(0);
}

if(flag2 && !flag) {
  security_message(port:port);
  exit(0);
}

exit(99);