Ubuntu 16.04 ESM : ncurses vulnerabilities (USN-5477-1)

##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5477-1. 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(162173);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/28");

  script_cve_id(
    "CVE-2017-16879",
    "CVE-2018-19211",
    "CVE-2019-17594",
    "CVE-2019-17595",
    "CVE-2021-39537",
    "CVE-2022-29458"
  );
  script_xref(name:"USN", value:"5477-1");

  script_name(english:"Ubuntu 16.04 ESM : ncurses vulnerabilities (USN-5477-1)");

  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-5477-1 advisory.

    Hosein Askari discovered that ncurses was incorrectly performing memory management operations when dealing
    with long filenames while writing structures into the file system. An attacker could possibly use this
    issue to cause a denial of service or execute arbitrary code. (CVE-2017-16879)

    Chung-Yi Lin discovered that ncurses was incorrectly handling access to invalid memory areas when parsing
    terminfo or termcap entries where the use-name had invalid syntax. An attacker could possibly use this
    issue to cause a denial of service. (CVE-2018-19211)

    It was discovered that ncurses was incorrectly performing bounds checks when processing invalid hashcodes.
    An attacker could possibly use this issue to cause a denial of service or to expose sensitive information.
    (CVE-2019-17594)

    It was discovered that ncurses was incorrectly handling end-of-string characters when processing terminfo
    and termcap files. An attacker could possibly use this issue to cause a denial of service or to expose
    sensitive information. (CVE-2019-17595)

    It was discovered that ncurses was incorrectly handling end-of-string characters when converting between
    termcap and terminfo formats. An attacker could possibly use this issue to cause a denial of service or
    execute arbitrary code. (CVE-2021-39537)

    It was discovered that ncurses was incorrectly performing bounds checks when dealing with corrupt terminfo
    data while reading a terminfo file. An attacker could possibly use this issue to cause a denial of service
    or to expose sensitive information. (CVE-2022-29458)

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-5477-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:R/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-2021-39537");

  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:"2017/11/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/06/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/06/14");

  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:lib32ncurses5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lib32ncurses5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lib32ncursesw5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lib32ncursesw5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lib32tinfo-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lib32tinfo5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lib64ncurses5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lib64ncurses5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lib64tinfo5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libncurses5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libncurses5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libncursesw5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libncursesw5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libtinfo-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libtinfo5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libx32ncurses5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libx32ncurses5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libx32ncursesw5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libx32ncursesw5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libx32tinfo-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libx32tinfo5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ncurses-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ncurses-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ncurses-examples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ncurses-term");
  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) 2022-2024 Canonical, Inc. / NASL script (C) 2022-2024 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)) 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 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': 'lib32ncurses5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'lib32ncurses5-dev', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'lib32ncursesw5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'lib32ncursesw5-dev', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'lib32tinfo-dev', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'lib32tinfo5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'lib64ncurses5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'lib64ncurses5-dev', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'lib64tinfo5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libncurses5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libncurses5-dev', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libncursesw5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libncursesw5-dev', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libtinfo-dev', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libtinfo5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libx32ncurses5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libx32ncurses5-dev', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libx32ncursesw5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libx32ncursesw5-dev', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libx32tinfo-dev', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libx32tinfo5', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'ncurses-base', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'ncurses-bin', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'ncurses-examples', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'ncurses-term', 'pkgver': '6.0+20160213-1ubuntu1+esm2', 'ubuntu_pro': TRUE}
];

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'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) {
        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, 'lib32ncurses5 / lib32ncurses5-dev / lib32ncursesw5 / etc');
}