Vulnerabilities > CVE-2018-20176 - Out-of-bounds Read vulnerability in Rdesktop

#
# (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(122412);
  script_version("1.3");
  script_cvs_date("Date: 2020/02/07");

  script_cve_id("CVE-2018-20174", "CVE-2018-20175", "CVE-2018-20176", "CVE-2018-20177", "CVE-2018-20178", "CVE-2018-20179", "CVE-2018-20180", "CVE-2018-20181", "CVE-2018-20182", "CVE-2018-8791", "CVE-2018-8792", "CVE-2018-8793", "CVE-2018-8794", "CVE-2018-8795", "CVE-2018-8796", "CVE-2018-8797", "CVE-2018-8798", "CVE-2018-8799", "CVE-2018-8800");

  script_name(english:"FreeBSD : rdesktop - critical - Remote Code Execution (3e2c9b63-223c-4575-af5c-816acb14e445)");
  script_summary(english:"Checks for updated package in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote FreeBSD host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"- Fix memory corruption in process_bitmap_data - CVE-2018-8794

- Fix remote code execution in process_bitmap_data - CVE-2018-8795

- Fix remote code execution in process_plane - CVE-2018-8797

- Fix Denial of Service in mcs_recv_connect_response - CVE-2018-20175

- Fix Denial of Service in mcs_parse_domain_params - CVE-2018-20175

- Fix Denial of Service in sec_parse_crypt_info - CVE-2018-20176

- Fix Denial of Service in sec_recv - CVE-2018-20176

- Fix minor information leak in rdpdr_process - CVE-2018-8791

- Fix Denial of Service in cssp_read_tsrequest - CVE-2018-8792

- Fix remote code execution in cssp_read_tsrequest - CVE-2018-8793

- Fix Denial of Service in process_bitmap_data - CVE-2018-8796

- Fix minor information leak in rdpsnd_process_ping - CVE-2018-8798

- Fix Denial of Service in process_secondary_order - CVE-2018-8799

- Fix remote code execution in in ui_clip_handle_data - CVE-2018-8800

- Fix major information leak in ui_clip_handle_data - CVE-2018-20174

- Fix memory corruption in rdp_in_unistr - CVE-2018-20177

- Fix Denial of Service in process_demand_active - CVE-2018-20178

- Fix remote code execution in lspci_process - CVE-2018-20179

- Fix remote code execution in rdpsnddbg_process - CVE-2018-20180

- Fix remote code execution in seamless_process - CVE-2018-20181

- Fix remote code execution in seamless_process_line - CVE-2018-20182"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://github.com/rdesktop/rdesktop/releases/tag/v1.8.4"
  );
  # https://vuxml.freebsd.org/freebsd/3e2c9b63-223c-4575-af5c-816acb14e445.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?db0e2c57"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  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:"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:rdesktop");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/02/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/25");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2020 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:"rdesktop<1.8.4")) 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");