Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS : Gnuplot vulnerabilities (USN-7589-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7589-1. 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(240563);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/06/26");

  script_cve_id(
    "CVE-2018-19490",
    "CVE-2018-19491",
    "CVE-2018-19492",
    "CVE-2020-25412",
    "CVE-2020-25559",
    "CVE-2020-25969",
    "CVE-2021-44917"
  );
  script_xref(name:"USN", value:"7589-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS : Gnuplot vulnerabilities (USN-7589-1)");

  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 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by
multiple vulnerabilities as referenced in the USN-7589-1 advisory.

    Tim Blazytko, Cornelius Aschermann, Sergej Schumilo, and Nils Bars discovered that Gnuplot had several
    memory-related issues. An attacker could possibly use these issues to cause Gnuplot to experience a buffer
    overflow, resulting in a denial of service or arbitrary code execution. These issues only affected Ubuntu
    14.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-19490, CVE-2018-19491, CVE-2018-19492)

    It was discovered that Gnuplot could write out-of-bounds due to the use of strncpy(). An attacker could
    possibly use this issue to enable the execution of arbitrary code. This issue only affected Ubuntu 20.04
    LTS. (CVE-2020-25412)

    It was discovered that Gnuplot incorrectly freed memory when executing print_set_output(). An attacker
    could possibly use this issue to enable the execution of arbitrary code. (CVE-2020-25559)

    It was discovered that Gnuplot's plotrequest() function contained a buffer overflow. An attacker could
    possibly use this issue to cause Gnuplot to crash, resulting in a denial of service or arbitrary code
    execution. (CVE-2020-25969)

    It was discovered that Gnuplot's boundary3d() function could be made to divide by zero. An attacker could
    possibly use this issue to cause Gnuplot to crash, resulting in a denial of service. (CVE-2021-44917)

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-7589-1");
  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-2020-25412");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-25969");

  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:"2018/11/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/06/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/06/26");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  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:gnuplot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gnuplot-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gnuplot-nox");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gnuplot-qt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gnuplot-tex");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gnuplot-x11");
  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 (! ('14.04' >< os_release || '16.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 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': '14.04', 'pkgname': 'gnuplot', 'pkgver': '4.6.4-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '14.04', 'pkgname': 'gnuplot-nox', 'pkgver': '4.6.4-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '14.04', 'pkgname': 'gnuplot-qt', 'pkgver': '4.6.4-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '14.04', 'pkgname': 'gnuplot-x11', 'pkgver': '4.6.4-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '16.04', 'pkgname': 'gnuplot', 'pkgver': '4.6.6-3ubuntu0.1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '16.04', 'pkgname': 'gnuplot-data', 'pkgver': '4.6.6-3ubuntu0.1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '16.04', 'pkgname': 'gnuplot-nox', 'pkgver': '4.6.6-3ubuntu0.1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '16.04', 'pkgname': 'gnuplot-qt', 'pkgver': '4.6.6-3ubuntu0.1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '16.04', 'pkgname': 'gnuplot-tex', 'pkgver': '4.6.6-3ubuntu0.1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '16.04', 'pkgname': 'gnuplot-x11', 'pkgver': '4.6.6-3ubuntu0.1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '18.04', 'pkgname': 'gnuplot', 'pkgver': '5.2.2+dfsg1-2ubuntu1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '18.04', 'pkgname': 'gnuplot-data', 'pkgver': '5.2.2+dfsg1-2ubuntu1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '18.04', 'pkgname': 'gnuplot-nox', 'pkgver': '5.2.2+dfsg1-2ubuntu1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '18.04', 'pkgname': 'gnuplot-qt', 'pkgver': '5.2.2+dfsg1-2ubuntu1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '18.04', 'pkgname': 'gnuplot-x11', 'pkgver': '5.2.2+dfsg1-2ubuntu1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '20.04', 'pkgname': 'gnuplot', 'pkgver': '5.2.8+dfsg1-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25412', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '20.04', 'pkgname': 'gnuplot-data', 'pkgver': '5.2.8+dfsg1-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25412', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '20.04', 'pkgname': 'gnuplot-nox', 'pkgver': '5.2.8+dfsg1-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25412', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '20.04', 'pkgname': 'gnuplot-qt', 'pkgver': '5.2.8+dfsg1-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25412', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']},
    {'osver': '20.04', 'pkgname': 'gnuplot-x11', 'pkgver': '5.2.8+dfsg1-2ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2018-19490', 'CVE-2018-19491', 'CVE-2018-19492', 'CVE-2020-25412', 'CVE-2020-25559', 'CVE-2020-25969', 'CVE-2021-44917']}
];

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_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, 'gnuplot / gnuplot-data / gnuplot-nox / gnuplot-qt / gnuplot-tex / etc');
}