Ubuntu 16.04 ESM : Linux kernel (GCP) vulnerabilities (USN-5695-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5695-1. 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(166414);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/29");

  script_cve_id(
    "CVE-2022-0812",
    "CVE-2022-1012",
    "CVE-2022-2318",
    "CVE-2022-26365",
    "CVE-2022-32296",
    "CVE-2022-33740",
    "CVE-2022-33741",
    "CVE-2022-33742",
    "CVE-2022-33744"
  );
  script_xref(name:"USN", value:"5695-1");

  script_name(english:"Ubuntu 16.04 ESM : Linux kernel (GCP) vulnerabilities (USN-5695-1)");

  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 a package installed that is affected by multiple vulnerabilities as referenced in
the USN-5695-1 advisory.

    It was discovered that the SUNRPC RDMA protocol implementation in the Linux kernel did not properly
    calculate the header size of a RPC message payload. A local attacker could use this to expose sensitive
    information (kernel memory). (CVE-2022-0812)

    Moshe Kol, Amit Klein and Yossi Gilad discovered that the IP implementation in the Linux kernel did not
    provide sufficient randomization when calculating port offsets. An attacker could possibly use this to
    expose sensitive information. (CVE-2022-1012, CVE-2022-32296)

    Duoming Zhou discovered that race conditions existed in the timer handling implementation of the Linux
    kernel's Rose X.25 protocol layer, resulting in use-after-free vulnerabilities. A local attacker could use
    this to cause a denial of service (system crash). (CVE-2022-2318)

    Roger Pau Monn discovered that the Xen virtual block driver in the Linux kernel did not properly
    initialize memory pages to be used for shared communication with the backend. A local attacker could use
    this to expose sensitive information (guest kernel memory). (CVE-2022-26365)

    Roger Pau Monn discovered that the Xen paravirtualization frontend in the Linux kernel did not properly
    initialize memory pages to be used for shared communication with the backend. A local attacker could use
    this to expose sensitive information (guest kernel memory). (CVE-2022-33740)

    It was discovered that the Xen paravirtualization frontend in the Linux kernel incorrectly shared
    unrelated data when communicating with certain backends. A local attacker could use this to cause a denial
    of service (guest crash) or expose sensitive information (guest kernel memory). (CVE-2022-33741,
    CVE-2022-33742)

    Oleksandr Tyshchenko discovered that the Xen paravirtualization platform in the Linux kernel on ARM
    platforms contained a race condition in certain situations. An attacker in a guest VM could use this to
    cause a denial of service in the host OS. (CVE-2022-33744)

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-5695-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/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:N/AC:L/PR:N/UI:N/S:U/C:L/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-2022-33742");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2022-1012");

  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:"2022/06/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/10/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/10/21");

  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:linux-image-4.15.0-1137-gcp");
  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", "linux_alt_patch_detect.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');
include('ksplice.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 kernel_mappings = {
  '16.04': {
    '4.15.0': {
      'gcp': '4.15.0-1137'
    }
  }
};

var host_kernel_release = get_kb_item('Host/uptrack-uname-r');
if (empty_or_null(host_kernel_release)) host_kernel_release = get_kb_item_or_exit('Host/uname-r');
var host_kernel_base_version = get_kb_item_or_exit('Host/Debian/kernel-base-version');
var host_kernel_type = get_kb_item_or_exit('Host/Debian/kernel-type');
if(empty_or_null(kernel_mappings[os_release][host_kernel_base_version][host_kernel_type])) audit(AUDIT_INST_VER_NOT_VULN, 'kernel ' + host_kernel_release);

var extra = '';
var kernel_fixed_version = kernel_mappings[os_release][host_kernel_base_version][host_kernel_type] + "-" + host_kernel_type;
if (!ubuntu_pro_detected) {
  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';
}
if (deb_ver_cmp(ver1:host_kernel_release, ver2:kernel_fixed_version) < 0)
{
  extra += 'Running Kernel level of ' + host_kernel_release + ' does not meet the minimum fixed level of ' + kernel_fixed_version + ' for this advisory.\n\n';
}
  else
{
  audit(AUDIT_PATCH_INSTALLED, 'Kernel package for USN-5695-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2022-0812', 'CVE-2022-1012', 'CVE-2022-2318', 'CVE-2022-26365', 'CVE-2022-32296', 'CVE-2022-33740', 'CVE-2022-33741', 'CVE-2022-33742', 'CVE-2022-33744');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-5695-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    extra      : extra
  );
  exit(0);
}