FFmpeg <= 4.1 Multiple Vulnerabilities

# Copyright (C) 2019 Greenbone Networks GmbH
#
# 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.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.113356");
  script_version("2022-10-10T10:12:14+0000");
  script_tag(name:"last_modification", value:"2022-10-10 10:12:14 +0000 (Mon, 10 Oct 2022)");
  script_tag(name:"creation_date", value:"2019-03-14 12:23:14 +0200 (Thu, 14 Mar 2019)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:N/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-10-07 02:15:00 +0000 (Fri, 07 Oct 2022)");

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

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

  script_cve_id("CVE-2019-9718", "CVE-2019-9721");

  script_name("FFmpeg <= 4.1 Multiple Vulnerabilities");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2019 Greenbone Networks GmbH");
  script_family("Denial of Service");
  script_dependencies("gb_ffmpeg_detect_lin.nasl");
  script_mandatory_keys("FFmpeg/Linux/Ver");

  script_tag(name:"summary", value:"FFmpeg is prone to multiple vulnerabilities.");
  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
  script_tag(name:"insight", value:"A vulnerability in the subtitle decoder allows attackers
  to hog the CPU via a crafted video file in Matroska format:

  - because ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex
    format argument to sscanf

  - because handle_open_brace in libavcodec/htmlsubtitles.c has a complex
    format argument to sscanf");
  script_tag(name:"impact", value:"Successful exploitation would allow an attacker to exhaust the target
  system's CPU resources.");
  script_tag(name:"affected", value:"FFmpeg through version 4.1.0.");
  script_tag(name:"solution", value:"Update to version 4.1.1.");

  script_xref(name:"URL", value:"https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/894995c41e0795c7a44f81adc4838dedc3932e65");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/107384");
  script_xref(name:"URL", value:"https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/1f00c97bc3475c477f3c468cf2d924d5761d0982");

  exit(0);
}

CPE = "cpe:/a:ffmpeg:ffmpeg";

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

if( ! version = get_app_version( cpe: CPE ) ) exit( 0 );

if( version_is_less( version: version, test_version: "4.1.1" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "4.1.1" );
  security_message( data: report, port: 0 );
  exit( 0 );
}

exit( 99 );