Vulnerabilities > CVE-2017-6921 - Improper Input Validation vulnerability in Drupal

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2018 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(101276);
  script_version("3.5");
  script_cvs_date("Date: 2018/11/10 11:49:46");

  script_cve_id("CVE-2017-6920", "CVE-2017-6921", "CVE-2017-6922");

  script_name(english:"FreeBSD : drupal -- Drupal Core - Multiple Vulnerabilities (4fc2df49-6279-11e7-be0f-6cf0497db129)");
  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:
"Drupal Security Team Reports :

CVE-2017-6920: PECL YAML parser unsafe object handling.

CVE-2017-6921: File REST resource does not properly validate

CVE-2017-6922: Files uploaded by anonymous users into a private file
system can be accessed by other anonymous users."
  );
  # https://vuxml.freebsd.org/freebsd/4fc2df49-6279-11e7-be0f-6cf0497db129.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?d5d19c09"
  );
  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_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:drupal7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:drupal8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/07/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/07");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 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:"drupal7<7.56")) flag++;
if (pkg_test(save_report:TRUE, pkg:"drupal8<8.3.4")) 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(101063);
  script_version("1.9");
  script_cvs_date("Date: 2019/11/13");

  script_cve_id("CVE-2017-6920", "CVE-2017-6921", "CVE-2017-6922");
  script_bugtraq_id(99211, 99219, 99222);

  script_name(english:"Drupal 7.x < 7.56 / 8.x < 8.3.4 Multiple Vulnerabilities (SA-CORE-2017-003)");
  script_summary(english:"Checks the version of Drupal.");

  script_set_attribute(attribute:"synopsis", value:
"A PHP application running on the remote web server is affected by
multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, the instance of Drupal running
on the remote web server is 7.x prior to 7.56 or 8.x prior to 8.3.4.
It is, therefore, affected by multiple vulnerabilities :

  - A flaw exists in the PECL YAML parser due to unsafe
    handling of PHP objects during certain operations. An
    unauthenticated, remote attacker can exploit this to
    execute arbitrary code. (CVE-2017-6920)

  - A flaw exists in the file REST resource due to improper
    validation of user-supplied input to multiple fields
    when manipulating files. An unauthenticated, remote
    attacker can exploit this to have an unspecified impact
    on integrity. Note that a site is only affected by this
    issue if it has the RESTful Web Services (rest) module
    enabled, the file REST resource is enabled and allows
    PATCH requests, and the attacker can get or register a
    user account on the site with permissions to upload
    files and to modify the file resource. (CVE-2017-6921)

  - An information disclosure vulnerability exists due to a
    failure to ensure that private files that have been
    uploaded by an anonymous user but not permanently
    attached to content on the site are only visible to the
    anonymous user who uploaded them instead of all
    anonymous users. An unauthenticated, remote attacker can
    exploit this to disclose the files of other anonymous
    users. (CVE-2017-6922)

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://www.drupal.org/SA-CORE-2017-003");
  script_set_attribute(attribute:"see_also", value:"https://www.drupal.org/project/drupal/releases/7.56");
  script_set_attribute(attribute:"see_also", value:"https://www.drupal.org/project/drupal/releases/8.3.4");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Drupal version 7.56 / 8.3.4 or later.");
  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:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-6920");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/06/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/27");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:drupal:drupal");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("drupal_detect.nasl");
  script_require_keys("installed_sw/Drupal", "Settings/ParanoidReport");
  script_require_ports("Services/www", 80, 443);

  exit(0);
}

include("vcf.inc");
include("http.inc");

if (report_paranoia < 2) audit(AUDIT_PARANOID);

port = get_http_port(default:80, php:TRUE);

app_info = vcf::get_app_info(app:"Drupal", port:port, webapp:true);

vcf::check_granularity(app_info:app_info, sig_segments:2);

constraints = [
  { "min_version" : "7.0", "max_version" : "7.55", "fixed_version" : "7.56" },
  { "min_version" : "8.0", "max_version" : "8.3.3", "fixed_version" : "8.3.4" }
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);