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
6.8 Medium
AI Score
Confidence
Low
0.0004 Low
EPSS
Percentile
15.5%
Unbound DNS Resolver is prone to a denial of service (DoS)
vulnerability.
# SPDX-FileCopyrightText: 2024 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:/a:nlnetlabs:unbound";
if (description)
{
script_oid("1.3.6.1.4.1.25623.1.0.114414");
script_version("2024-03-08T05:05:30+0000");
script_tag(name:"last_modification", value:"2024-03-08 05:05:30 +0000 (Fri, 08 Mar 2024)");
script_tag(name:"creation_date", value:"2024-03-07 14:16:22 +0000 (Thu, 07 Mar 2024)");
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_cve_id("CVE-2024-1931");
script_tag(name:"qod_type", value:"remote_banner_unreliable");
script_tag(name:"solution_type", value:"VendorFix");
script_name("Unbound DNS Resolver 1.18.0 - 1.19.1 DoS Vulnerability");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2024 Greenbone AG");
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 (DoS)
vulnerability.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
script_tag(name:"insight", value:"Recent versions of Unbound contain a vulnerability that can
cause denial of service by a certain code path that can lead to an infinite loop.
This issue can only be triggered if the non-default option 'ede: yes' is used, Unbound would reply
with attached EDE information on a positive reply, and the client's buffer size is relatively
smaller than the needed space to include EDE records.");
script_tag(name:"affected", value:"Ubound DNS Resolver versions 1.18.0 through 1.19.1.");
script_tag(name:"solution", value:"Update to version 1.19.2 or later.");
script_xref(name:"URL", value:"https://nlnetlabs.nl/news/2024/Mar/07/unbound-1.19.2-released/");
script_xref(name:"URL", value:"https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-1931.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: "1.18.0", test_version2: "1.19.1")) {
report = report_fixed_ver(installed_version: version, fixed_version: "1.19.2");
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
6.8 Medium
AI Score
Confidence
Low
0.0004 Low
EPSS
Percentile
15.5%