Ubuntu 16.04 ESM : FFmpeg vulnerabilities (USN-5167-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5167-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(183614);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/20");

  script_cve_id(
    "CVE-2020-20445",
    "CVE-2020-20446",
    "CVE-2020-20451",
    "CVE-2020-20453",
    "CVE-2020-20892",
    "CVE-2020-20902",
    "CVE-2020-21041",
    "CVE-2020-21688",
    "CVE-2020-21697",
    "CVE-2020-22016",
    "CVE-2020-22020",
    "CVE-2020-22021",
    "CVE-2020-22022",
    "CVE-2020-22025",
    "CVE-2020-22031",
    "CVE-2020-22032",
    "CVE-2020-22037",
    "CVE-2020-22040",
    "CVE-2020-22041",
    "CVE-2020-22042",
    "CVE-2020-22044",
    "CVE-2020-22046",
    "CVE-2020-22049",
    "CVE-2020-22054",
    "CVE-2020-35965",
    "CVE-2021-3566",
    "CVE-2021-38114",
    "CVE-2021-38171",
    "CVE-2021-38291"
  );
  script_xref(name:"USN", value:"5167-1");

  script_name(english:"Ubuntu 16.04 ESM : FFmpeg vulnerabilities (USN-5167-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 16.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in
the USN-5167-1 advisory.

  - FFmpeg 4.2 is affected by a Divide By Zero issue via libavcodec/lpc.h, which allows a remote malicious
    user to cause a Denial of Service. (CVE-2020-20445)

  - FFmpeg 4.2 is affected by a Divide By Zero issue via libavcodec/aacpsy.c, which allows a remote malicious
    user to cause a Denial of Service. (CVE-2020-20446)

  - Denial of Service issue in FFmpeg 4.2 due to resource management errors via fftools/cmdutils.c.
    (CVE-2020-20451)

  - FFmpeg 4.2 is affected by a Divide By Zero issue via libavcodec/aaccoder, which allows a remote malicious
    user to cause a Denial of Service (CVE-2020-20453)

  - An issue was discovered in function filter_frame in libavfilter/vf_lenscorrection.c in Ffmpeg 4.2.1,
    allows attackers to cause a Denial of Service or other unspecified impacts due to a division by zero.
    (CVE-2020-20892)

  - A CWE-125: Out-of-bounds read vulnerability exists in long_term_filter function in g729postfilter.c in
    FFmpeg 4.2.1 during computation of the denominator of pseudo-normalized correlation R'(0), that could
    result in disclosure of information. (CVE-2020-20902)

  - Buffer Overflow vulnerability exists in FFmpeg 4.1 via apng_do_inverse_blend in libavcodec/pngenc.c, which
    could let a remote malicious user cause a Denial of Service (CVE-2020-21041)

  - A heap-use-after-free in the av_freep function in libavutil/mem.c of FFmpeg 4.2 allows attackers to
    execute arbitrary code. (CVE-2020-21688)

  - A heap-use-after-free in the mpeg_mux_write_packet function in libavformat/mpegenc.c of FFmpeg 4.2 allows
    to cause a denial of service (DOS) via a crafted avi file. (CVE-2020-21697)

  - A heap-based Buffer Overflow vulnerability in FFmpeg 4.2 at libavcodec/get_bits.h when writing .mov files,
    which might lead to memory corruption and other potential consequences. (CVE-2020-22016)

  - Buffer Overflow vulnerability in FFmpeg 4.2 in the build_diff_map function in libavfilter/vf_fieldmatch.c,
    which could let a remote malicious user cause a Denial of Service. (CVE-2020-22020)

  - Buffer Overflow vulnerability in FFmpeg 4.2 at filter_edges function in libavfilter/vf_yadif.c, which
    could let a remote malicious user cause a Denial of Service. (CVE-2020-22021)

  - A heap-based Buffer Overflow vulnerability exists in FFmpeg 4.2 in filter_frame at
    libavfilter/vf_fieldorder.c, which might lead to memory corruption and other potential consequences.
    (CVE-2020-22022)

  - A heap-based Buffer Overflow vulnerability exists in gaussian_blur at libavfilter/vf_edgedetect.c, which
    might lead to memory corruption and other potential consequences. (CVE-2020-22025)

  - A Heap-based Buffer Overflow vulnerability exists in FFmpeg 4.2 at libavfilter/vf_w3fdif.c in
    filter16_complex_low, which might lead to memory corruption and other potential consequences.
    (CVE-2020-22031)

  - A heap-based Buffer Overflow vulnerability exists FFmpeg 4.2 at libavfilter/vf_edgedetect.c in
    gaussian_blur, which might lead to memory corruption and other potential consequences. (CVE-2020-22032)

  - A Denial of Service vulnerability exists in FFmpeg 4.2 due to a memory leak in avcodec_alloc_context3 at
    options.c. (CVE-2020-22037)

  - A Denial of Service vulnerability exists in FFmpeg 4.2 idue to a memory leak in the v_frame_alloc function
    in frame.c. (CVE-2020-22040)

  - A Denial of Service vulnerability exists in FFmpeg 4.2 due to a memory leak in the
    av_buffersrc_add_frame_flags function in buffersrc. (CVE-2020-22041)

  - A Denial of Service vulnerability exists in FFmpeg 4.2 due to a memory leak is affected by: memory leak in
    the link_filter_inouts function in libavfilter/graphparser.c. (CVE-2020-22042)

  - A Denial of Service vulnerability exists in FFmpeg 4.2 due to a memory leak in the
    url_open_dyn_buf_internal function in libavformat/aviobuf.c. (CVE-2020-22044)

  - A Denial of Service vulnerability exists in FFmpeg 4.2 due to a memory leak in the avpriv_float_dsp_allocl
    function in libavutil/float_dsp.c. (CVE-2020-22046)

  - A Denial of Service vulnerability exists in FFmpeg 4.2 due to a memory leak in the wtvfile_open_sector
    function in wtvdec.c. (CVE-2020-22049)

  - A Denial of Service vulnerability exists in FFmpeg 4.2 due to a memory leak in the av_dict_set function in
    dict.c. (CVE-2020-22054)

  - decode_frame in libavcodec/exr.c in FFmpeg 4.3.1 has an out-of-bounds write because of errors in
    calculations of when to perform memset zero operations. (CVE-2020-35965)

  - Prior to ffmpeg version 4.3, the tty demuxer did not have a 'read_probe' function assigned to it. By
    crafting a legitimate ffconcat file that references an image, followed by a file the triggers the tty
    demuxer, the contents of the second file will be copied into the output file verbatim (as long as the
    `-vcodec copy` option is passed to ffmpeg). (CVE-2021-3566)

  - libavcodec/dnxhddec.c in FFmpeg 4.4 does not check the return value of the init_vlc function, a similar
    issue to CVE-2013-0868. (CVE-2021-38114)

  - adts_decode_extradata in libavformat/adtsenc.c in FFmpeg 4.4 does not check the init_get_bits return
    value, which is a necessary step because the second argument to init_get_bits can be crafted.
    (CVE-2021-38171)

  - FFmpeg version (git commit de8e6e67e7523e48bb27ac224a0b446df05e1640) suffers from a an assertion failure
    at src/libavutil/mathematics.c. (CVE-2021-38291)

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://ubuntu.com/security/notices/USN-5167-1");
  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_cvss_temporal_vector("CVSS2#E:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-38171");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/01/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/06/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:esm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ffmpeg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libav-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavcodec-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavcodec-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavcodec-ffmpeg-extra56");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavcodec-ffmpeg56");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavdevice-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavdevice-ffmpeg56");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavfilter-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavfilter-ffmpeg5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavformat-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavformat-ffmpeg56");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavresample-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavresample-ffmpeg2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavutil-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavutil-ffmpeg54");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpostproc-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpostproc-ffmpeg53");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libswresample-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libswresample-ffmpeg1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libswscale-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libswscale-ffmpeg3");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2023 Canonical, Inc. / NASL script (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('16.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '16.04', 'pkgname': 'ffmpeg', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libav-tools', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavcodec-dev', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavcodec-extra', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavcodec-ffmpeg-extra56', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavcodec-ffmpeg56', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavdevice-dev', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavdevice-ffmpeg56', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavfilter-dev', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavfilter-ffmpeg5', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavformat-dev', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavformat-ffmpeg56', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavresample-dev', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavresample-ffmpeg2', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavutil-dev', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libavutil-ffmpeg54', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libpostproc-dev', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libpostproc-ffmpeg53', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libswresample-dev', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libswresample-ffmpeg1', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libswscale-dev', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'},
    {'osver': '16.04', 'pkgname': 'libswscale-ffmpeg3', 'pkgver': '7:2.8.17-0ubuntu0.1+esm4'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ffmpeg / libav-tools / libavcodec-dev / libavcodec-extra / etc');
}