Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : MuPDF vulnerabilities (USN-7825-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7825-1. 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(270675);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/16");

  script_cve_id(
    "CVE-2018-10289",
    "CVE-2018-16647",
    "CVE-2018-16648",
    "CVE-2018-1000036",
    "CVE-2020-21896",
    "CVE-2020-26683",
    "CVE-2021-3407",
    "CVE-2021-37220"
  );
  script_xref(name:"USN", value:"7825-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : MuPDF vulnerabilities (USN-7825-1)");

  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 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-7825-1 advisory.

    It was discovered that MuPDF incorrectly managed memory, resulting in a memory leak. An attacker could
    possibly use this issue to cause a denial of service. This issue only affected Ubuntu 18.04 LTS.
    (CVE-2018-1000036)

    It was discovered that MuPDF could enter an infinite loop when parsing certain PDF files. An attacker
    could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 18.04 LTS.
    (CVE-2018-10289)

    It was discovered that MuPDF incorrectly managed memory, possibly leading to a segmentation fault. An
    attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 18.04
    LTS. (CVE-2018-16647, CVE-2018-16648)

    It was discovered that MuPDF contained a use-after-free vulnerability. An attacker could possibly use this
    issue to cause a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
    (CVE-2020-21896)

    It was discovered that MuPDF incorrectly managed memory, resulting in a memory leak. An attacker could
    possibly use this issue to cause a denial of service or obtain sensitive information. This issue only
    affected Ubuntu 20.04 LTS. (CVE-2020-26683)

    Maxim Mishechkin, Vitalii Akolzin, Shamil Kurmangaleev, Denis Straghkov, Fedor Nis'kov and Ivan Gulakov
    discovered that MuPDF incorrectly managed memory under certain circumstances, leading to a double-free. An
    attacker could possibly use this to cause a denial of service. This issue only affected Ubuntu 16.04 LTS,
    Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-3407)

    Xuwei Liu discovered that MuPDF may perform an out-of-bounds write under certain circumstances. An
    attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 18.04
    LTS and Ubuntu 20.04 LTS. (CVE-2021-37220)

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-7825-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected libmupdf-dev, mupdf and / or mupdf-tools packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-37220");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-26683");

  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:"2018/04/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/10/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmupdf-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:mupdf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:mupdf-tools");
  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) 2025 Canonical, Inc. / NASL script (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "ubuntu_pro_sub_detect.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 || '18.04' >< os_release || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 20.04', '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 ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '16.04', 'pkgname': 'libmupdf-dev', 'pkgver': '1.7a-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-3407']},
    {'osver': '16.04', 'pkgname': 'mupdf', 'pkgver': '1.7a-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-3407']},
    {'osver': '16.04', 'pkgname': 'mupdf-tools', 'pkgver': '1.7a-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-3407']},
    {'osver': '18.04', 'pkgname': 'libmupdf-dev', 'pkgver': '1.12.0+ds1-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-10289', 'CVE-2018-16647', 'CVE-2018-16648', 'CVE-2018-1000036', 'CVE-2020-21896', 'CVE-2021-3407', 'CVE-2021-37220']},
    {'osver': '18.04', 'pkgname': 'mupdf', 'pkgver': '1.12.0+ds1-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-10289', 'CVE-2018-16647', 'CVE-2018-16648', 'CVE-2018-1000036', 'CVE-2020-21896', 'CVE-2021-3407', 'CVE-2021-37220']},
    {'osver': '18.04', 'pkgname': 'mupdf-tools', 'pkgver': '1.12.0+ds1-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-10289', 'CVE-2018-16647', 'CVE-2018-16648', 'CVE-2018-1000036', 'CVE-2020-21896', 'CVE-2021-3407', 'CVE-2021-37220']},
    {'osver': '20.04', 'pkgname': 'libmupdf-dev', 'pkgver': '1.16.1+ds1-1ubuntu1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2020-21896', 'CVE-2020-26683', 'CVE-2021-3407', 'CVE-2021-37220']},
    {'osver': '20.04', 'pkgname': 'mupdf', 'pkgver': '1.16.1+ds1-1ubuntu1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2020-21896', 'CVE-2020-26683', 'CVE-2021-3407', 'CVE-2021-37220']},
    {'osver': '20.04', 'pkgname': 'mupdf-tools', 'pkgver': '1.16.1+ds1-1ubuntu1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2020-21896', 'CVE-2020-26683', 'CVE-2021-3407', 'CVE-2021-37220']}
];

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'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) {
        flag++;
        if (!ubuntu_pro_detected && !pro_caveat_needed) pro_caveat_needed = pro_required;
    }
  }
}

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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, 'libmupdf-dev / mupdf / mupdf-tools');
}