Ubuntu 14.04 LTS : GRUB vulnerability (USN-2836-1)

#%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-2836-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

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

if (description)
{
  script_id(87408);
  script_version("2.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/20");

  script_cve_id("CVE-2015-8370");
  script_xref(name:"USN", value:"2836-1");

  script_name(english:"Ubuntu 14.04 LTS : GRUB vulnerability (USN-2836-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"Hector Marco and Ismael Ripoll discovered that GRUB incorrectly
handled the backspace key when configured to use authentication. A
local attacker could use this issue to bypass GRUB password
protection.

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-2836-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
  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-2015-8370");

  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:"2015/12/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/12/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub2-common");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-coreboot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-coreboot-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-efi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-efi-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-efi-amd64-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-efi-arm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-efi-arm-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-efi-arm64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-efi-arm64-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-efi-ia32");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-efi-ia32-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-emu");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-firmware-qemu");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-ieee1275");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-ieee1275-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-linuxbios");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-mount-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-pc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-pc-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-rescue-pc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-theme-starfield");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-uboot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-uboot-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-xen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub-xen-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:grub2");
  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) 2015-2020 Canonical, Inc. / NASL script (C) 2015-2019 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 (! ('14.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04', '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': '14.04', 'pkgname': 'grub-common', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-coreboot', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-coreboot-bin', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-efi', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-efi-amd64', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-efi-amd64-bin', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-efi-arm', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-efi-arm-bin', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-efi-arm64', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-efi-arm64-bin', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-efi-ia32', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-efi-ia32-bin', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-emu', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-firmware-qemu', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-ieee1275', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-ieee1275-bin', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-linuxbios', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-mount-udeb', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-pc', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-pc-bin', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-rescue-pc', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-theme-starfield', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-uboot', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-uboot-bin', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-xen', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub-xen-bin', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub2', 'pkgver': '2.02~beta2-9ubuntu1.6'},
    {'osver': '14.04', 'pkgname': 'grub2-common', 'pkgver': '2.02~beta2-9ubuntu1.6'}
];

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_WARNING,
    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, 'grub-common / grub-coreboot / grub-coreboot-bin / grub-efi / etc');
}