Vulnerabilities > CVE-2020-2101 - Information Exposure Through Discrepancy vulnerability in Jenkins

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2020 Jacques Vidrine and contributors
#
# Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
# HTML, PDF, PostScript, RTF and so forth) with or without modification,
# are permitted provided that the following conditions are met:
# 1. Redistributions of source code (VuXML) must retain the above
#    copyright notice, this list of conditions and the following
#    disclaimer as the first lines of this file unmodified.
# 2. Redistributions in compiled form (transformed to other DTDs,
#    published online in any format, converted to PDF, PostScript,
#    RTF and other formats) must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
#    distribution.
# 
# THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

include("compat.inc");

if (description)
{
  script_id(133329);
  script_version("1.3");
  script_cvs_date("Date: 2020/02/03");

  script_cve_id("CVE-2020-2099", "CVE-2020-2100", "CVE-2020-2101", "CVE-2020-2102", "CVE-2020-2103", "CVE-2020-2104", "CVE-2020-2105", "CVE-2020-2106", "CVE-2020-2107", "CVE-2020-2108");

  script_name(english:"FreeBSD : jenkins -- multiple vulnerabilities (a250539d-d1d4-4591-afd3-c8bdfac335d8)");
  script_summary(english:"Checks for updated packages in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote FreeBSD host is missing one or more security-related
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Jenkins Security Advisory : Description(High) SECURITY-1682 /
CVE-2020-2099 Inbound TCP Agent Protocol/3 authentication bypass
(Medium) SECURITY-1641 / CVE-2020-2100 Jenkins vulnerable to UDP
amplification reflection attack (Medium) SECURITY-1659 / CVE-2020-2101
Non-constant time comparison of inbound TCP agent connection secret
(Medium) SECURITY-1660 / CVE-2020-2102 Non-constant time HMAC
comparison (Medium) SECURITY-1695 / CVE-2020-2103 Diagnostic page
exposed session cookies (Medium) SECURITY-1650 / CVE-2020-2104 Memory
usage graphs accessible to anyone with Overall/Read (Low)
SECURITY-1704 / CVE-2020-2105 Jenkins REST APIs vulnerable to
clickjacking (Medium) SECURITY-1680 / CVE-2020-2106 Stored XSS
vulnerability in Code Coverage API Plugin (Medium) SECURITY-1565 /
CVE-2020-2107 Fortify Plugin stored credentials in plain text (High)
SECURITY-1719 / CVE-2020-2108 XXE vulnerability in WebSphere Deployer
Plugin"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://jenkins.io/security/advisory/2020-01-29/"
  );
  # https://vuxml.freebsd.org/freebsd/a250539d-d1d4-4591-afd3-c8bdfac335d8.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?46cd87fc"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-2099");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:jenkins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:jenkins-lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/01/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/01/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/01/30");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"FreeBSD Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");

  exit(0);
}


include("audit.inc");
include("freebsd_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (pkg_test(save_report:TRUE, pkg:"jenkins<=2.219")) flag++;
if (pkg_test(save_report:TRUE, pkg:"jenkins-lts<=2.204.2")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:pkg_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(133527);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/03");

  script_cve_id(
    "CVE-2020-2100",
    "CVE-2020-2101",
    "CVE-2020-2102",
    "CVE-2020-2103",
    "CVE-2020-2104",
    "CVE-2020-2105",
    "CVE-2020-2106"
  );

  script_name(english:"Jenkins < 2.204.2 LTS / 2.219 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"A job scheduling and management system hosted on the remote web server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Jenkins running on the remote web server is prior to
2.219 or is a version of Jenkins LTS prior to 2.204.2. It is, therefore,
affected by multiple vulnerabilities:

  - An UDP amplification reflection attack can be used in a DDoS attack
    on a Jenkins master. Within the same network, spoofed UDP packets
    could also be sent to make two Jenkins masters go into an infinite
    loop of replies to one another, thus causing a denial of service.
    (CVE-2020-2100)

  - A non-constant time comparison of inbound TCP agent connection secret
    is used when an inbound TCP agent connection is initiated. This allows
    attackers to use statistical methods to obtain the connection secret.
    (CVE-2020-2101)

  - A non-constant time HMAC comparison is used when checking whether two
    HMACs are equal. This could potentially allow attackers to use
    statistical methods to obtain a valid HMAC for an attacker-controlled
    input value. (CVE-2020-2102)

  - User metadata on the /whoAmI page includes the HTTP session ID which
    allows attackers able to exploit a cross-site scripting vulnerability
    to obtain the HTTP session ID value. (CVE-2020-2103)

  - A lack of appropriate permissions allows anyone with Overall/Read
    permissions to access the JVM memory usage chart for the Jenkins master.
    (CVE-2020-2104)

  - The Jenkins REST APIs allows an attacker to perform a clickjacking
    attack by routing them to a specially crafted web page, and can expose
    the content of the REST API endpoint. (CVE-2020-2105)

Note that Nessus has not tested for these issues but has instead relied
only on the application's self-reported version number.");
  script_set_attribute(attribute:"see_also", value:"https://jenkins.io/security/advisory/2020-01-29/");
  script_set_attribute(attribute:"solution", value:
"Upgrade Jenkins to version 2.219 or later, Jenkins LTS to version 2.204.2 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-2105");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/01/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/01/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/02/06");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cloudbees:jenkins");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("jenkins_detect.nasl");
  script_require_keys("www/Jenkins");
  script_require_ports("Services/www", 8080);

  exit(0);
}

include('audit.inc');
include('global_settings.inc');
include('misc_func.inc');
include('http.inc');
include('vcf.inc');

port = get_http_port(default:8080);
app = vcf::get_app_info(app:'Jenkins', webapp:TRUE, port:port);

if(app['LTS'])
  constraints = [{'fixed_version' : '2.204.2', 'fixed_display' : '2.204.2 LTS / 2.219'}];
else
  constraints = [{'fixed_version' : '2.219', 'fixed_display' : '2.204.2 LTS / 2.219'}];

vcf::check_version_and_report(app_info:app, constraints:constraints, severity:SECURITY_WARNING, strict:FALSE);