Ubuntu 20.04 LTS / 22.04 LTS / 23.10 : EDK II vulnerabilities (USN-6638-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6638-1. 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(190562);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/15");

  script_cve_id(
    "CVE-2022-36763",
    "CVE-2022-36764",
    "CVE-2022-36765",
    "CVE-2023-45230",
    "CVE-2023-45231",
    "CVE-2023-45232",
    "CVE-2023-45233",
    "CVE-2023-45234",
    "CVE-2023-45235",
    "CVE-2023-48733"
  );
  script_xref(name:"USN", value:"6638-1");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 23.10 : EDK II vulnerabilities (USN-6638-1)");

  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 20.04 LTS / 22.04 LTS / 23.10 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-6638-1 advisory.

  - EDK2 is susceptible to a vulnerability in the Tcg2MeasureGptTable() function, allowing a user to trigger a
    heap buffer overflow via a local network. Successful exploitation of this vulnerability may result in a
    compromise of confidentiality, integrity, and/or availability. (CVE-2022-36763)

  - EDK2 is susceptible to a vulnerability in the Tcg2MeasurePeImage() function, allowing a user to trigger a
    heap buffer overflow via a local network. Successful exploitation of this vulnerability may result in a
    compromise of confidentiality, integrity, and/or availability. (CVE-2022-36764)

  - EDK2 is susceptible to a vulnerability in the CreateHob() function, allowing a user to trigger a integer
    overflow to buffer overflow via a local network. Successful exploitation of this vulnerability may result
    in a compromise of confidentiality, integrity, and/or availability. (CVE-2022-36765)

  - EDK2's Network Package is susceptible to a buffer overflow vulnerability via a long server ID option in
    DHCPv6 client. This vulnerability can be exploited by an attacker to gain unauthorized access and
    potentially lead to a loss of Confidentiality, Integrity and/or Availability. (CVE-2023-45230)

  - EDK2's Network Package is susceptible to an out-of-bounds read vulnerability when processing Neighbor
    Discovery Redirect message. This vulnerability can be exploited by an attacker to gain unauthorized access
    and potentially lead to a loss of Confidentiality. (CVE-2023-45231)

  - EDK2's Network Package is susceptible to an infinite loop vulnerability when parsing unknown options in
    the Destination Options header of IPv6. This vulnerability can be exploited by an attacker to gain
    unauthorized access and potentially lead to a loss of Availability. (CVE-2023-45232)

  - EDK2's Network Package is susceptible to an infinite lop vulnerability when parsing a PadN option in the
    Destination Options header of IPv6. This vulnerability can be exploited by an attacker to gain
    unauthorized access and potentially lead to a loss of Availability. (CVE-2023-45233)

  - EDK2's Network Package is susceptible to a buffer overflow vulnerability when processing DNS Servers
    option from a DHCPv6 Advertise message. This vulnerability can be exploited by an attacker to gain
    unauthorized access and potentially lead to a loss of Confidentiality, Integrity and/or Availability.
    (CVE-2023-45234)

  - EDK2's Network Package is susceptible to a buffer overflow vulnerability when handling Server ID option
    from a DHCPv6 proxy Advertise message. This vulnerability can be exploited by an attacker to gain
    unauthorized access and potentially lead to a loss of Confidentiality, Integrity and/or Availability.
    (CVE-2023-45235)

  - An insecure default to allow UEFI Shell in EDK2 was left enabled in Ubuntu's EDK2. This allows an OS-
    resident attacker to bypass Secure Boot. (CVE-2023-48733)

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-6638-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/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:A/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-2023-45235");

  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:"2024/01/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/02/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/02/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:23.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:efi-shell-aa64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:efi-shell-arm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:efi-shell-ia32");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:efi-shell-x64");
  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:ovmf-ia32");
  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:"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) 2024 Canonical, Inc. / NASL script (C) 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 (! ('20.04' >< os_release || '22.04' >< os_release || '23.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 23.10', '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': '20.04', 'pkgname': 'ovmf', 'pkgver': '0~20191122.bd85bf54-2ubuntu3.5'},
    {'osver': '20.04', 'pkgname': 'qemu-efi', 'pkgver': '0~20191122.bd85bf54-2ubuntu3.5'},
    {'osver': '20.04', 'pkgname': 'qemu-efi-aarch64', 'pkgver': '0~20191122.bd85bf54-2ubuntu3.5'},
    {'osver': '20.04', 'pkgname': 'qemu-efi-arm', 'pkgver': '0~20191122.bd85bf54-2ubuntu3.5'},
    {'osver': '22.04', 'pkgname': 'ovmf', 'pkgver': '2022.02-3ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'ovmf-ia32', 'pkgver': '2022.02-3ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'qemu-efi', 'pkgver': '2022.02-3ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'qemu-efi-aarch64', 'pkgver': '2022.02-3ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'qemu-efi-arm', 'pkgver': '2022.02-3ubuntu0.22.04.2'},
    {'osver': '23.10', 'pkgname': 'efi-shell-aa64', 'pkgver': '2023.05-2ubuntu0.1'},
    {'osver': '23.10', 'pkgname': 'efi-shell-arm', 'pkgver': '2023.05-2ubuntu0.1'},
    {'osver': '23.10', 'pkgname': 'efi-shell-ia32', 'pkgver': '2023.05-2ubuntu0.1'},
    {'osver': '23.10', 'pkgname': 'efi-shell-x64', 'pkgver': '2023.05-2ubuntu0.1'},
    {'osver': '23.10', 'pkgname': 'ovmf', 'pkgver': '2023.05-2ubuntu0.1'},
    {'osver': '23.10', 'pkgname': 'ovmf-ia32', 'pkgver': '2023.05-2ubuntu0.1'},
    {'osver': '23.10', 'pkgname': 'qemu-efi-aarch64', 'pkgver': '2023.05-2ubuntu0.1'},
    {'osver': '23.10', 'pkgname': 'qemu-efi-arm', 'pkgver': '2023.05-2ubuntu0.1'}
];

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_HOLE,
    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, 'efi-shell-aa64 / efi-shell-arm / efi-shell-ia32 / efi-shell-x64 / etc');
}