Juniper NetScreen Firewall DNS lookup/Malformed IPv6 packet Denial of Service Vulnerability

# SPDX-FileCopyrightText: 2015 Greenbone AG
# 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

CPE = "cpe:/o:juniper:screenos";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.105270");
  script_cve_id("CVE-2014-3814");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_version("2026-04-24T06:23:04+0000");

  script_name("Juniper NetScreen Firewall DNS lookup/Malformed IPv6 packet Denial of Service Vulnerability");

  script_xref(name:"URL", value:"https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10632");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/68100");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/68099");

  script_tag(name:"impact", value:"Successful exploits may allow the attacker to cause denial-of-service conditions.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"A Denial of Service (DoS) issue has been
  found in Juniper Networks NetScreen Firewall products. When
  encountered, this issue can cause the device to crash and reboot. If
  an attacker were to repeatedly exploit the issue a sustained denial
  of service could take place on the device. The issue is caused when
  a certain sequence of malformed IPv6 packets are sent to the
  device's IP directly. This issue will not take place if the packets
  are traversing the network through the firewall.");

  script_tag(name:"solution", value:"Updates are available. Please see the references or
  vendor advisory for more information.");

  script_tag(name:"summary", value:"Juniper NetScreen Firewall is prone to a denial of service (DoS) vulnerability.");

  script_tag(name:"affected", value:"ScreenOS 6.3 prior to 6.3.0r17.");

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

  script_tag(name:"qod_type", value:"package");

  script_tag(name:"last_modification", value:"2026-04-24 06:23:04 +0000 (Fri, 24 Apr 2026)");
  script_tag(name:"creation_date", value:"2015-05-08 15:40:14 +0200 (Fri, 08 May 2015)");
  script_category(ACT_GATHER_INFO);
  script_family("Denial of Service");
  script_copyright("Copyright (C) 2015 Greenbone AG");
  script_dependencies("gb_screenos_version.nasl");
  script_mandatory_keys("ScreenOS/version");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if( ! version = get_app_version( cpe:CPE ) )
  if( ! version = get_kb_item("ScreenOS/version") ) exit( 0 );

if( version !~ "^6\.3\." ) exit( 99 );

display_fix = '6.3.0r17';
display_version = version;

fix = str_replace( string:display_fix, find:"r", replace:"." );
version = str_replace( string:version, find:"r", replace:"." );

if( version_is_less( version:version, test_version:fix ) )
{
  report = 'Installed version: ' + display_version + '\n' +
           'Fixed version:     ' + display_fix + '\n';

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

exit( 99 );