Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS / 22.04 LTS : Linux kernel vulnerabilities (USN-5485-1)

##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5485-1. 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(162394);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id("CVE-2022-21123", "CVE-2022-21125", "CVE-2022-21166");
  script_xref(name:"USN", value:"5485-1");

  script_name(english:"Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS / 22.04 LTS : Linux kernel vulnerabilities (USN-5485-1)");

  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 / 18.04 LTS / 20.04 LTS / 22.04 LTS host has a package installed that is affected by
multiple vulnerabilities as referenced in the USN-5485-1 advisory.

    It was discovered that some Intel processors did not completely perform cleanup actions on multi-core
    shared buffers. A local attacker could possibly use this to expose sensitive information. (CVE-2022-21123)

    It was discovered that some Intel processors did not completely perform cleanup actions on
    microarchitectural fill buffers. A local attacker could possibly use this to expose sensitive information.
    (CVE-2022-21125)

    It was discovered that some Intel processors did not properly perform cleanup during specific special
    register write operations. A local attacker could possibly use this to expose sensitive information.
    (CVE-2022-21166)

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-5485-1");
  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:N");
  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:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-21166");

  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:"2022/06/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/06/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/06/17");

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  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");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1101-oracle");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1013-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-39-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-39-generic-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-39-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-39-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-39-lowlatency-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1028-ibm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1048-gkeop");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1078-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1080-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1080-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1085-azure");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-120-generic-lpae");
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  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 || '18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 20.04 / 22.04', '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': {
      'generic': '4.15.0-187',
      'lowlatency': '4.15.0-187',
      'oracle': '4.15.0-1101',
      'gcp': '4.15.0-1130',
      'aws': '4.15.0-1136',
      'aws-hwe': '4.15.0-1136',
      'azure': '4.15.0-1145'
    }
  },
  '18.04': {
    '4.15.0': {
      'generic': '4.15.0-187',
      'generic-lpae': '4.15.0-187',
      'lowlatency': '4.15.0-187',
      'dell300x': '4.15.0-1048',
      'oracle': '4.15.0-1101',
      'kvm': '4.15.0-1122',
      'gcp': '4.15.0-1130',
      'aws': '4.15.0-1136',
      'azure': '4.15.0-1145'
    },
    '5.4.0': {
      'generic': '5.4.0-120',
      'generic-lpae': '5.4.0-120',
      'lowlatency': '5.4.0-120',
      'ibm': '5.4.0-1028',
      'gkeop': '5.4.0-1048',
      'gke': '5.4.0-1076',
      'oracle': '5.4.0-1078',
      'aws': '5.4.0-1080',
      'gcp': '5.4.0-1080',
      'azure': '5.4.0-1085'
    }
  },
  '20.04': {
    '5.13.0': {
      'generic': '5.13.0-51',
      'generic-64k': '5.13.0-51',
      'generic-lpae': '5.13.0-51',
      'lowlatency': '5.13.0-51',
      'intel': '5.13.0-1017',
      'azure': '5.13.0-1031',
      'gcp': '5.13.0-1033',
      'oracle': '5.13.0-1036'
    },
    '5.4.0': {
      'generic': '5.4.0-120',
      'generic-lpae': '5.4.0-120',
      'lowlatency': '5.4.0-120',
      'ibm': '5.4.0-1028',
      'gkeop': '5.4.0-1048',
      'kvm': '5.4.0-1070',
      'gke': '5.4.0-1076',
      'oracle': '5.4.0-1078',
      'aws': '5.4.0-1080',
      'gcp': '5.4.0-1080',
      'azure-fde': '5.4.0-1085'
    }
  },
  '22.04': {
    '5.15.0': {
      'generic': '5.15.0-39',
      'generic-64k': '5.15.0-39',
      'generic-lpae': '5.15.0-39',
      'lowlatency': '5.15.0-39',
      'lowlatency-64k': '5.15.0-39',
      'ibm': '5.15.0-1009',
      'gcp': '5.15.0-1010',
      'oracle': '5.15.0-1011',
      'azure': '5.15.0-1012',
      'aws': '5.15.0-1013'
    }
  }
};

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-5485-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2022-21123', 'CVE-2022-21125', 'CVE-2022-21166');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-5485-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    extra      : extra
  );
  exit(0);
}