Ubuntu 26.04 LTS : FFmpeg vulnerabilities (USN-8738-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8738-1. 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(344612);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/10");

  script_cve_id(
    "CVE-2026-66036",
    "CVE-2026-66038",
    "CVE-2026-66039",
    "CVE-2026-70628",
    "CVE-2026-70632"
  );
  script_xref(name:"USN", value:"8738-1");

  script_name(english:"Ubuntu 26.04 LTS : FFmpeg vulnerabilities (USN-8738-1)");

  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 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in
the USN-8738-1 advisory.

    It was discovered that FFmpeg incorrectly handled certain video frames when using the hqdn3d filter. An
    attacker could possibly use this issue to cause a denial of service or execute arbitrary code.
    (CVE-2026-66036)

    Adrian Junge discovered that FFmpeg incorrectly handled certain compressed video files. An attacker could
    possibly use this issue to expose sensitive information. (CVE-2026-66038)

    Adrian Junge discovered that FFmpeg incorrectly handled certain audio files. An attacker could possibly
    use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-66039)

    Adrian Junge discovered that FFmpeg incorrectly handled certain subtitle files. An attacker could possibly
    use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-70628)

    Adrian Junge discovered that FFmpeg incorrectly handled certain video files. An attacker could possibly
    use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-70632)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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-8738-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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:R/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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-66036");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-66039");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  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:libavcodec-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavcodec-extra62");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavcodec62");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavdevice62");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavfilter-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavfilter-extra11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavfilter11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavformat-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavformat-extra62");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavformat62");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavutil60");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libswresample6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libswscale9");
  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) 2026 Canonical, Inc. / NASL script (C) 2026 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 (! ('26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 26.04', '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': '26.04', 'pkgname': 'ffmpeg', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavcodec-extra', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavcodec-extra62', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavcodec62', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavdevice62', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavfilter-extra', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavfilter-extra11', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavfilter11', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavformat-extra', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavformat-extra62', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavformat62', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libavutil60', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libswresample6', 'pkgver': '7:8.0.1-3ubuntu2+esm3'},
    {'osver': '26.04', 'pkgname': 'libswscale9', 'pkgver': '7:8.0.1-3ubuntu2+esm3'}
];

var flag = 0;
foreach var 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 (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ffmpeg / libavcodec-extra / libavcodec-extra62 / libavcodec62 / etc');
}