CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
53.2%
CKEditor is prone to multiple regular expression denial of
service (ReDoS) vulnerabilities.
# Copyright (C) 2021 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:ckeditor:ckeditor";
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.117500");
script_version("2021-08-26T13:01:12+0000");
script_tag(name:"last_modification", value:"2021-08-26 13:01:12 +0000 (Thu, 26 Aug 2021)");
script_tag(name:"creation_date", value:"2021-01-28 04:31:29 +0000 (Thu, 28 Jan 2021)");
script_tag(name:"cvss_base", value:"4.3");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:N/A:P");
script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H");
script_tag(name:"severity_origin", value:"NVD");
script_tag(name:"severity_date", value:"2021-07-20 23:15:00 +0000 (Tue, 20 Jul 2021)");
script_cve_id("CVE-2021-26271", "CVE-2021-26272");
script_tag(name:"qod_type", value:"remote_banner");
script_tag(name:"solution_type", value:"VendorFix");
script_name("CKEditor 4.0 < 4.16 Multiple ReDoS Vulnerabilities - Windows");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
script_family("Denial of Service");
script_dependencies("sw_ckeditor_http_detect.nasl", "os_detection.nasl");
script_mandatory_keys("ckeditor/detected", "Host/runs_windows");
script_tag(name:"summary", value:"CKEditor is prone to multiple regular expression denial of
service (ReDoS) vulnerabilities.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
script_tag(name:"insight", value:"The following vulnerabilities exist:
- CVE-2021-26271: ReDoS in the Advanced Tab for Dialogs plugin
- CVE-2021-26272: ReDoS in the Autolink plugin");
script_tag(name:"affected", value:"CKEditor version 4.0 through 4.15.1.");
script_tag(name:"solution", value:"Update to version 4.16 or later");
script_xref(name:"URL", value:"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416");
exit(0);
}
include("version_func.inc");
include("host_details.inc");
if (!port = get_app_port(cpe: CPE))
exit(0);
if (!infos = get_app_version_and_location(cpe: CPE, port: port, exit_no_version: TRUE))
exit(0);
version = infos["version"];
location = infos["location"];
if (version_in_range(version: version, test_version:"4.0", test_version2: "4.15.1")) {
report = report_fixed_ver(installed_version: version, fixed_version:"4.16", install_path: location);
security_message(port: port, data: report);
exit(0);
}
exit(99);
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
53.2%