Ubuntu 16.04 ESM : Avahi vulnerability (USN-5008-2)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5008-2. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(151451);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/20");

  script_cve_id("CVE-2021-3468");
  script_xref(name:"USN", value:"5008-2");

  script_name(english:"Ubuntu 16.04 ESM : Avahi vulnerability (USN-5008-2)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 16.04 LTS host has packages installed that are affected by a vulnerability as referenced in the
USN-5008-2 advisory.

  - A flaw was found in avahi in versions 0.6 up to 0.8. The event used to signal the termination of the
    client connection on the avahi Unix socket is not correctly handled in the client_work function, allowing
    a local attacker to trigger an infinite loop. The highest threat from this vulnerability is to the
    availability of the avahi service, which becomes unresponsive after this flaw is triggered.
    (CVE-2021-3468)

Note that Nessus has not tested for this issue 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-5008-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P");
  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:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3468");

  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:"2021/06/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/07/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/07/08");

  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:avahi-autoipd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:avahi-daemon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:avahi-discover");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:avahi-dnsconfd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:avahi-ui-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:avahi-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-client-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-client3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-common-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-common-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-common3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-common3-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-compat-libdnssd-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-compat-libdnssd1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-core-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-core7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-core7-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-glib-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-glib1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-gobject-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-gobject0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-qt4-1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-qt4-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-ui-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-ui-gtk3-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-ui-gtk3-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libavahi-ui0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-avahi");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2021-2023 Canonical, Inc. / NASL script (C) 2021-2023 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 (! ('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 pkgs = [
    {'osver': '16.04', 'pkgname': 'avahi-autoipd', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'avahi-daemon', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'avahi-discover', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'avahi-dnsconfd', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'avahi-ui-utils', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'avahi-utils', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-client-dev', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-client3', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-common-data', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-common-dev', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-common3', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-common3-udeb', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-compat-libdnssd-dev', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-compat-libdnssd1', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-core-dev', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-core7', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-core7-udeb', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-glib-dev', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-glib1', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-gobject-dev', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-gobject0', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-qt4-1', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-qt4-dev', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-ui-dev', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-ui-gtk3-0', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-ui-gtk3-dev', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'libavahi-ui0', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'},
    {'osver': '16.04', 'pkgname': 'python-avahi', 'pkgver': '0.6.32~rc+dfsg-1ubuntu2.3+esm1'}
];

var flag = 0;
foreach 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 (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'avahi-autoipd / avahi-daemon / avahi-discover / avahi-dnsconfd / etc');
}