Mozilla Firefox Security Advisory (MFSA2020-54) - Linux

# 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:mozilla:firefox";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.2.1.2020.54");
  script_cve_id("CVE-2020-16042", "CVE-2020-26971", "CVE-2020-26972", "CVE-2020-26973", "CVE-2020-26974", "CVE-2020-26976", "CVE-2020-26978", "CVE-2020-26979", "CVE-2020-35111", "CVE-2020-35113", "CVE-2020-35114");
  script_tag(name:"creation_date", value:"2021-11-08 15:21:25 +0000 (Mon, 08 Nov 2021)");
  script_version("2022-09-22T10:44:54+0000");
  script_tag(name:"last_modification", value:"2022-09-22 10:44:54 +0000 (Thu, 22 Sep 2022)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-01-11 18:39:00 +0000 (Mon, 11 Jan 2021)");

  script_name("Mozilla Firefox Security Advisory (MFSA2020-54) - Linux");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("General");
  script_dependencies("gb_firefox_detect_lin.nasl");
  script_mandatory_keys("mozilla/firefox/linux/detected");

  script_xref(name:"Advisory-ID", value:"MFSA2020-54");
  script_xref(name:"URL", value:"https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1607449%2C1640416%2C1656459%2C1669914%2C1673567");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1641287%2C1673299");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1664831%2C1673589");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/show_bug.cgi?id=1657916");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/show_bug.cgi?id=1663466");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/show_bug.cgi?id=1671382");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/show_bug.cgi?id=1674343");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/show_bug.cgi?id=1677047");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/show_bug.cgi?id=1679003");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/show_bug.cgi?id=1680084");
  script_xref(name:"URL", value:"https://bugzilla.mozilla.org/show_bug.cgi?id=1681022");

  script_tag(name:"summary", value:"This host is missing a security update for Mozilla Firefox.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");

  script_tag(name:"insight", value:"CVE-2020-16042: Operations on a BigInt could have caused uninitialized memory to be exposed
When a BigInt was right-shifted the backing store was not properly cleared, allowing uninitialized memory to be read.

CVE-2020-26971: Heap buffer overflow in WebGL
Certain blit values provided by the user were not properly constrained leading to a heap buffer overflow on some video drivers.

CVE-2020-26972: Use-After-Free in WebGL
The lifecycle of IPC Actors allows managed actors to outlive their manager actors, and the former must ensure that they are not attempting to use a dead actor they have a reference to. Such a check was omitted in WebGL, resulting in a use-after-free and a potentially exploitable crash.

CVE-2020-26973: CSS Sanitizer performed incorrect sanitization
Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass.

CVE-2020-26974: Incorrect cast of StyleGenericFlexBasis resulted in a heap use-after-free
When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash.

CVE-2020-26976: HTTPS pages could have been intercepted by a registered service worker when they should not have been
When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the iframe not being a secure context due to the (insecure) framing.

CVE-2020-26978: Internal network hosts could have been probed by a malicious webpage
Using techniques that built on the slipstream research, a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine.

CVE-2020-26979: When entering an address in the address or search bars, a website could have redirected the user before they were navigated to the intended url
When a user typed a URL ... [Please see the references for more information on the vulnerabilities]");

  script_tag(name:"affected", value:"Firefox version(s) below 84.");

  script_tag(name:"solution", value:"The vendor has released an update. Please see the reference(s) for more information.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"executable_version_unreliable");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if (!infos = get_app_version_and_location(cpe: CPE, exit_no_version: TRUE))
  exit(0);

version = infos["version"];
location = infos["location"];

if (version_is_less(version: version, test_version: "84")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "84", install_path: location);
  security_message(port: 0, data: report);
  exit(0);
}

exit(99);