Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Pillow vulnerabilities (USN-8399-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8399-1. 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(320408);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/11");

  script_cve_id(
    "CVE-2026-42308",
    "CVE-2026-42309",
    "CVE-2026-42310",
    "CVE-2026-42311"
  );
  script_xref(name:"USN", value:"8399-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Pillow vulnerabilities (USN-8399-1)");

  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 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-8399-1 advisory.

    It was discovered that Pillow incorrectly handled large glyph advance values in fonts. An attacker could
    possibly use this issue to cause Pillow to crash, resulting in a denial of service. (CVE-2026-42308)

    It was discovered that Pillow incorrectly handled nested coordinate lists in certain APIs. An attacker
    could possibly use this issue to cause Pillow to crash, resulting in a denial of service. This issue only
    affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42309)

    It was discovered that Pillow incorrectly handled certain malformed PDF files. An attacker could possibly
    use this issue to cause Pillow to use excessive resources, leading to a denial of service.
    (CVE-2026-42310)

    It was discovered that Pillow incorrectly handled certain malformed PSD files. An attacker could possibly
    use this issue to cause Pillow to crash, resulting in a denial of service, or to execute arbitrary code.
    This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42311)

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-8399-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected python3-pil and / or python3-pil.imagetk packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/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:L/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:L/AC:L/AT:N/PR:N/UI:N/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-2026-42311");

  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:"2026/05/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  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:python3-pil");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-pil.imagetk");
  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 (! ('22.04' >< os_release || '24.04' >< os_release || '25.10' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 25.10 / 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': '22.04', 'pkgname': 'python3-pil', 'pkgver': '9.0.1-1ubuntu0.4', 'cves': ['CVE-2026-42308', 'CVE-2026-42310']},
    {'osver': '22.04', 'pkgname': 'python3-pil.imagetk', 'pkgver': '9.0.1-1ubuntu0.4', 'cves': ['CVE-2026-42308', 'CVE-2026-42310']},
    {'osver': '24.04', 'pkgname': 'python3-pil', 'pkgver': '10.2.0-1ubuntu1.2', 'cves': ['CVE-2026-42308', 'CVE-2026-42310']},
    {'osver': '24.04', 'pkgname': 'python3-pil.imagetk', 'pkgver': '10.2.0-1ubuntu1.2', 'cves': ['CVE-2026-42308', 'CVE-2026-42310']},
    {'osver': '25.10', 'pkgname': 'python3-pil', 'pkgver': '11.3.0-1ubuntu1.3', 'cves': ['CVE-2026-42308', 'CVE-2026-42309', 'CVE-2026-42310', 'CVE-2026-42311']},
    {'osver': '25.10', 'pkgname': 'python3-pil.imagetk', 'pkgver': '11.3.0-1ubuntu1.3', 'cves': ['CVE-2026-42308', 'CVE-2026-42309', 'CVE-2026-42310', 'CVE-2026-42311']},
    {'osver': '26.04', 'pkgname': 'python3-pil', 'pkgver': '12.1.1-2ubuntu1.2', 'cves': ['CVE-2026-42308', 'CVE-2026-42309', 'CVE-2026-42310', 'CVE-2026-42311']},
    {'osver': '26.04', 'pkgname': 'python3-pil.imagetk', 'pkgver': '12.1.1-2ubuntu1.2', 'cves': ['CVE-2026-42308', 'CVE-2026-42309', 'CVE-2026-42310', 'CVE-2026-42311']}
];

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, 'python3-pil / python3-pil.imagetk');
}