Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel kmsbd multiple vulnerabilities

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from Ubuntu Security
# Notice for CVE-2022-47939. Ubuntu(R) is a registered  trademark of
# Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(169894);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/01/12");

  script_cve_id(
    "CVE-2022-47938",
    "CVE-2022-47939",
    "CVE-2022-47940",
    "CVE-2022-47941",
    "CVE-2022-47942"
  );
  script_xref(name:"CEA-ID", value:"CEA-2022-0043");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel kmsbd multiple vulnerabilities");

  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 host is running a ksmbd server that is affected by multiple vulnerabilities:

  - An unauthenticated remote code execution vulnerability in the ksmbd component of the Linux kernel.
    (CVE-2022-47939)

  - An authenticated remote code execution vulnerability in the ksmbd component of the Linux kernel.
    (CVE-2022-47942)

  - An unauthenticated remote denial of service vulnerability in the ksmbd component of the Linux
    kernel. (CVE-2022-47941)

  - Authenticated denial of service vulnerabilities in the ksmbd component of the Linux kernel.
    (CVE-2022-47938, CVE-2022-47940)

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/CVE-2022-47939");
  script_set_attribute(attribute:"see_also", value:"https://www.openwall.com/lists/oss-security/2022/12/23/10");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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:H/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-2022-47939");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/12/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/11/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/01/11");

  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:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1008-gkeop");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1018-ibm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1020-gke");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1021-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1022-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1022-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1023-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-53-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-53-generic-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-53-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-53-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-53-lowlatency-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gke");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gkeop");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-ibm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-oracle");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2022-2023 Canonical, Inc. / NASL script (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "linux_alt_patch_detect.nasl", "linux_smb3_kernel_server_ksmbd_linux_installed.nbin");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l", "installed_sw/Linux SMB3 Kernel Server (KSMBD)");

  exit(0);
}

include('debian_package.inc');
include('install_func.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var app_name = 'Linux SMB3 Kernel Server (KSMBD)';

var installs = get_installs(app_name:app_name, exit_if_not_found:TRUE);
if (installs[0] != IF_OK) audit(AUDIT_FN_FAIL, "get_installs()", installs[0]);

var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! preg(pattern:"^(20\.04|22\.04)$", string:os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var machine_kernel_release = get_kb_item_or_exit('Host/uname-r');
if (machine_kernel_release)
{
  if (! preg(pattern:"^(5.15.0-\d{2}-(generic|generic-64k|generic-lpae|lowlatency|lowlatency-64k|hwe|lowlatency-hwe)|5.15.0-\d{4}-(azure|gcp|gke|gkeop|ibm|kvm|oracle))$", string:machine_kernel_release)) audit(AUDIT_INST_VER_NOT_VULN, 'kernel ' + machine_kernel_release);
  var extra = '';
  var kernel_mappings = {
    "5.15.0-\d{2}-(generic|generic-64k|generic-lpae|lowlatency|lowlatency-64k|hwe|lowlatency-hwe)" : "5.15.0-53",
    "5.15.0-\d{4}-azure" : "5.15.0-1023",
    "5.15.0-\d{4}-gcp" : "5.15.0-1022",
    "5.15.0-\d{4}-gke" : "5.15.0-1020",
    "5.15.0-\d{4}-gkeop" : "5.15.0-1008",
    "5.15.0-\d{4}-ibm" : "5.15.0-1018",
    "5.15.0-\d{4}-kvm" : "5.15.0-1021",
    "5.15.0-\d{4}-oracle" : "5.15.0-1022"
  };
  var trimmed_kernel_release = ereg_replace(string:machine_kernel_release, pattern:"(-\D+)$", replace:'');
  foreach var kernel_regex (keys(kernel_mappings)) {
    if (preg(pattern:kernel_regex, string:machine_kernel_release)) {
      if (deb_ver_cmp(ver1:trimmed_kernel_release, ver2:kernel_mappings[kernel_regex]) < 0)
      {
        extra = extra + 'Running Kernel level of ' + trimmed_kernel_release + ' does not meet the minimum fixed level of ' + kernel_mappings[kernel_regex] + ' for this advisory.\n\n';
      }
      else
      {
        audit(AUDIT_PATCH_INSTALLED, 'Kernel package for CVE-2022-47939');
      }
    }
  }
}

if (extra) {
  extra += '\nFound the following user-space daemons for ksmbd\n';
  foreach var install (installs[1])
    extra += '  ' + install.path + '\n';
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}