5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
6.5 Medium
AI Score
Confidence
High
3.5 Low
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:S/C:P/I:N/A:N
0.001 Low
EPSS
Percentile
27.7%
Jenkins is prone to an arbitrary file read vulnerability.
# 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:jenkins:jenkins";
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.145266");
script_version("2021-08-17T14:01:00+0000");
script_tag(name:"last_modification", value:"2021-08-17 14:01:00 +0000 (Tue, 17 Aug 2021)");
script_tag(name:"creation_date", value:"2021-01-28 03:32:56 +0000 (Thu, 28 Jan 2021)");
script_tag(name:"cvss_base", value:"3.5");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:S/C:P/I:N/A:N");
script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N");
script_tag(name:"severity_origin", value:"NVD");
script_tag(name:"severity_date", value:"2021-02-02 16:20:00 +0000 (Tue, 02 Feb 2021)");
script_cve_id("CVE-2021-21615");
script_tag(name:"qod_type", value:"remote_banner");
script_tag(name:"solution_type", value:"VendorFix");
script_name("Jenkins < 2.276, < 2.263.3 Arbitrary File Read Vulnerability");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
script_family("Web application abuses");
script_dependencies("gb_jenkins_consolidation.nasl");
script_mandatory_keys("jenkins/detected");
script_tag(name:"summary", value:"Jenkins is prone to an arbitrary file read vulnerability.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
script_tag(name:"insight", value:"Due to a time-of-check to time-of-use (TOCTOU) race condition, the file
browser for workspaces, archived artifacts, and $JENKINS_HOME/userContent/ follows symbolic links to
locations outside the directory being browsed in Jenkins.");
script_tag(name:"impact", value:"The vulnerability allows attackers with Job/Workspace permission and the
ability to control workspace contents, e.g., with Job/Configure permission or the ability to change SCM
contents, to create symbolic links that allow them to access files outside workspaces using the workspace browser.");
script_tag(name:"affected", value:"Jenkins version 2.275 and prior and 2.263.2 LTS and prior.");
script_tag(name:"solution", value:"Update to version 2.276, 2.263.3 LTS or later.");
script_xref(name:"URL", value:"https://www.jenkins.io/security/advisory/2021-01-26/#SECURITY-2197");
exit(0);
}
include("host_details.inc");
include("version_func.inc");
if(!port = get_app_port(cpe: CPE))
exit(0);
if(!infos = get_app_full(cpe: CPE, port: port, exit_no_version: TRUE))
exit(0);
version = infos["version"];
location = infos["location"];
proto = infos["proto"];
if(get_kb_item("jenkins/" + port + "/is_lts")) {
if(version_is_less(version: version, test_version: "2.263.3")) {
report = report_fixed_ver(installed_version: version, fixed_version: "2.263.3", install_path: location);
security_message(port: port, data: report, proto: proto);
exit(0);
}
} else {
if(version_is_less(version: version, test_version: "2.276")) {
report = report_fixed_ver(installed_version: version, fixed_version: "2.276", install_path: location);
security_message(port: port, data: report, proto: proto);
exit(0);
}
}
exit(99);
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
6.5 Medium
AI Score
Confidence
High
3.5 Low
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:S/C:P/I:N/A:N
0.001 Low
EPSS
Percentile
27.7%