Vulnerabilities > CVE-2018-6924 - Improper Input Validation vulnerability in Freebsd

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

include("compat.inc");

if (description)
{
  script_id(119887);
  script_version("1.4");
  script_cvs_date("Date: 2019/10/31 15:18:51");

  script_cve_id(
    "CVE-2018-3620",
    "CVE-2018-3646",
    "CVE-2018-6922",
    "CVE-2018-6923",
    "CVE-2018-6924",
    "CVE-2018-14526",
    "CVE-2018-15473",
    "CVE-2018-16055"
  );

  script_name(english:"pfSense 2.3.x <= 2.3.5-p2 / 2.4.x < 2.4.4 Multiple Vulnerabilities (SA-18_06 / SA-18_07 / SA-18_08)");
  script_summary(english:"Checks the version of pfSense.");

  script_set_attribute(attribute:"synopsis", value:
"The remote firewall host is affected by multiple
vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the remote pfSense
install is a version 2.3.x  prior or equal to  2.3.5-p2 or 2.4.x 
prior to 2.4.3-p1. It is, therefore, affected by multiple
vulnerabilities:

 - Systems with microprocessors utilizing speculative execution and 
   address translations may allow unauthorized disclosure of 
   information residing in the L1 data cache to an attacker with 
   local user access via a terminal page fault and a side-channel 
   analysis. (CVE-2018-3620)
   
 - An authenticated command injection vulnerability exists in 
   status_interfaces.php via dhcp_relinquish_lease() in pfSense
   before 2.4.4. This allows an authenticated WebGUI user with 
   privileges for the affected page to execute commands in the 
   context of the root user when submitting a request to relinquish
   a DHCP lease for an interface which is configured to obtain its
   address via DHCP. (CVE-2018-16055)
   
 -  a denial of service vulnerability exists in the ip fragment 
    reassembly code due to excessive system resource consumption. 
    This issue can allow a remote attacker who is able to send
    arbitrary ip fragments to cause the machine to consume excessive
    resources. (CVE-2018-6923)");
  # https://www.pfsense.org/security/advisories/pfSense-SA-18_06.webgui.asc
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c44a2d3c");
  # https://www.pfsense.org/security/advisories/pfSense-SA-18_07.webgui.asc
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b33cf0ad");
  # https://www.pfsense.org/security/advisories/pfSense-SA-18_08.webgui.asc
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?db4f32a9");
  # https://www.netgate.com/docs/pfsense/releases/2-4-4-new-features-and-changes.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7d4d989a");
  script_set_attribute(attribute:"solution", value:
"Upgrade to pfSense version 2.4.4 or later, or apply patches as noted
in the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-16055");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'CANVAS');

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/08/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/08/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/27");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:pfsense:pfsense");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:bsdperimeter:pfsense");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Firewalls");

  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("pfsense_detect.nbin");
  script_require_keys("Host/pfSense");

  exit(0);
}

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

if (!get_kb_item("Host/pfSense")) audit(AUDIT_HOST_NOT, "pfSense");

app_info = vcf::pfsense::get_app_info();
constraints = [
  {"min_version":"2.3.0", "max_version":"2.3.5-p2", "fixed_version":"2.4.4"},
  {"min_version":"2.4.0", "max_version":"2.4.3-p1", "fixed_version":"2.4.4"}
];

vcf::pfsense::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_HOLE,
  flags:{xss:TRUE}
);

#
# (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(117465);
  script_version("1.6");
  script_cvs_date("Date: 2018/12/07  9:46:53");

  script_cve_id("CVE-2018-6924");
  script_xref(name:"FreeBSD", value:"SA-18:12.elf");

  script_name(english:"FreeBSD : FreeBSD -- Improper ELF header parsing (a67c122a-b693-11e8-ac58-a4badb2f4699)");
  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:
"Insufficient validation was performed in the ELF header parser, and
malformed or otherwise invalid ELF binaries were not rejected as they
should be. Impact : Execution of a malicious ELF binary may result in
a kernel crash or may disclose kernel memory."
  );
  # https://vuxml.freebsd.org/freebsd/a67c122a-b693-11e8-ac58-a4badb2f4699.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?9aa15c0c"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/09/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/09/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/09/13");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 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", "Settings/ParanoidReport");

  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);


if (report_paranoia < 2) audit(AUDIT_PARANOID);

flag = 0;

if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=11.2<11.2_3")) flag++;
if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=11.1<11.1_14")) flag++;
if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=10.4<10.4_12")) flag++;

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