Ubuntu 16.04 LTS / 18.04 LTS : EDK II vulnerabilities (USN-4349-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4349-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('compat.inc');

if (description)
{
  script_id(136282);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2018-12178",
    "CVE-2018-12180",
    "CVE-2018-12181",
    "CVE-2019-14558",
    "CVE-2019-14559",
    "CVE-2019-14563",
    "CVE-2019-14575",
    "CVE-2019-14586",
    "CVE-2019-14587"
  );
  script_xref(name:"USN", value:"4349-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : EDK II vulnerabilities (USN-4349-1)");

  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 host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-4349-1 advisory.

    A buffer overflow was discovered in the network stack. An unprivileged user could potentially enable
    escalation of privilege and/or denial of service. This issue was already fixed in a previous release for
    18.04 LTS and 19.10. (CVE-2018-12178)

    A buffer overflow was discovered in BlockIo service. An unauthenticated user could potentially enable
    escalation of privilege, information disclosure and/or denial of service. This issue was already fixed in
    a previous release for 18.04 LTS and 19.10. (CVE-2018-12180)

    A stack overflow was discovered in bmp. An unprivileged user could potentially enable denial of service or
    elevation of privilege via local access. This issue was already fixed in a previous release for 18.04 LTS
    and 19.10. (CVE-2018-12181)

    It was discovered that memory was not cleared before free that could lead to potential password leak.
    (CVE-2019-14558)

    A memory leak was discovered in ArpOnFrameRcvdDpc. An attacker could possibly use this issue to cause a
    denial of service or other unspecified impact. (CVE-2019-14559)

    An integer overflow was discovered in MdeModulePkg/PiDxeS3BootScriptLib. An attacker could possibly use
    this issue to cause a denial of service or other unspecified impact. (CVE-2019-14563)

    It was discovered that the affected version doesn't properly check whether an unsigned EFI file should be
    allowed or not. An attacker could possibly load unsafe content by bypassing the verification.
    (CVE-2019-14575)

    It was discovered that original configuration runtime memory is freed, but it is still exposed to the OS
    runtime. (CVE-2019-14586)

    A double-unmap was discovered in TRB creation. An attacker could use it to cause a denial of service or
    other unspecified impact. (CVE-2019-14587)

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-4349-1");
  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:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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-2018-12180");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2018-12178");

  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:"2019/03/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/04/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ovmf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:qemu-efi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:qemu-efi-aarch64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:qemu-efi-arm");
  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:"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) 2020-2024 Canonical, Inc. / NASL script (C) 2020-2024 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 || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04', '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': 'ovmf', 'pkgver': '0~20160408.ffea0a2c-2ubuntu0.1'},
    {'osver': '16.04', 'pkgname': 'qemu-efi', 'pkgver': '0~20160408.ffea0a2c-2ubuntu0.1'},
    {'osver': '18.04', 'pkgname': 'ovmf', 'pkgver': '0~20180205.c0d9813c-2ubuntu0.2'},
    {'osver': '18.04', 'pkgname': 'qemu-efi', 'pkgver': '0~20180205.c0d9813c-2ubuntu0.2'},
    {'osver': '18.04', 'pkgname': 'qemu-efi-aarch64', 'pkgver': '0~20180205.c0d9813c-2ubuntu0.2'},
    {'osver': '18.04', 'pkgname': 'qemu-efi-arm', 'pkgver': '0~20180205.c0d9813c-2ubuntu0.2'}
];

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 (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  var extra = '';
  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, 'ovmf / qemu-efi / qemu-efi-aarch64 / qemu-efi-arm');
}