7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.4 High
AI Score
Confidence
High
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.166 Low
EPSS
Percentile
96.0%
Unbound DNS Resolver is prone to a denial of service vulnerability.
# Copyright (C) 2019 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
CPE = "cpe:/a:nlnetlabs:unbound";
if (description)
{
script_oid("1.3.6.1.4.1.25623.1.0.143049");
script_version("2021-08-31T13:01:28+0000");
script_tag(name:"last_modification", value:"2021-08-31 13:01:28 +0000 (Tue, 31 Aug 2021)");
script_tag(name:"creation_date", value:"2019-10-24 09:24:34 +0000 (Thu, 24 Oct 2019)");
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_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_tag(name:"severity_origin", value:"NVD");
script_tag(name:"severity_date", value:"2020-08-24 17:37:00 +0000 (Mon, 24 Aug 2020)");
script_cve_id("CVE-2019-16866");
script_tag(name:"qod_type", value:"remote_banner");
script_tag(name:"solution_type", value:"VendorFix");
script_name("Unbound DNS Resolver < 1.9.4 DoS Vulnerability");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2019 Greenbone Networks GmbH");
script_family("Denial of Service");
script_dependencies("unbound_version.nasl");
script_mandatory_keys("unbound/installed");
script_tag(name:"summary", value:"Unbound DNS Resolver is prone to a denial of service vulnerability.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
script_tag(name:"insight", value:"Unbound accesses uninitialized memory, which allows remote attackers to trigger
a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.");
script_tag(name:"affected", value:"Ubound DNS Resolver versions 1.7.1 - 1.9.3.");
script_tag(name:"solution", value:"Update to version 1.9.4 or later.");
script_xref(name:"URL", value:"https://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txt");
exit(0);
}
include("host_details.inc");
include("version_func.inc");
if (!port = get_app_port(cpe: CPE))
exit(0);
if (!infos = get_app_version_and_proto(cpe: CPE, port: port, exit_no_version: TRUE))
exit(0);
version = infos["version"];
proto = infos["proto"];
if (version_in_range(version: version, test_version: "1.7.1", test_version2: "1.9.3")) {
report = report_fixed_ver(installed_version: version, fixed_version: "1.9.4");
security_message(port: port, data: report, proto: proto);
exit(0);
}
exit(99);
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.4 High
AI Score
Confidence
High
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.166 Low
EPSS
Percentile
96.0%