Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-6831-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6831-1. 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(200450);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/12");

  script_cve_id(
    "CVE-2021-47063",
    "CVE-2021-47070",
    "CVE-2023-52504",
    "CVE-2024-0841",
    "CVE-2024-26688",
    "CVE-2024-26712",
    "CVE-2024-26733",
    "CVE-2024-26735",
    "CVE-2024-26736",
    "CVE-2024-26748",
    "CVE-2024-26749",
    "CVE-2024-26751",
    "CVE-2024-26752",
    "CVE-2024-26754",
    "CVE-2024-26763",
    "CVE-2024-26764",
    "CVE-2024-26766",
    "CVE-2024-26772",
    "CVE-2024-26773",
    "CVE-2024-26777",
    "CVE-2024-26778",
    "CVE-2024-26779",
    "CVE-2024-26788",
    "CVE-2024-26790",
    "CVE-2024-26791",
    "CVE-2024-26793",
    "CVE-2024-26801",
    "CVE-2024-26804",
    "CVE-2024-26805",
    "CVE-2024-26835",
    "CVE-2024-26839",
    "CVE-2024-26840",
    "CVE-2024-26845",
    "CVE-2024-26848",
    "CVE-2024-27405",
    "CVE-2024-27410",
    "CVE-2024-27412",
    "CVE-2024-27413",
    "CVE-2024-27414",
    "CVE-2024-27416",
    "CVE-2024-27417",
    "CVE-2024-35811"
  );
  script_xref(name:"USN", value:"6831-1");

  script_name(english:"Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-6831-1)");

  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 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as
referenced in the USN-6831-1 advisory.

    It was discovered that the HugeTLB file system component of the Linux Kernel contained a NULL pointer
    dereference vulnerability. A privileged attacker could possibly use this to to cause a denial of service.
    (CVE-2024-0841)

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to
    compromise the system. This update corrects flaws in the following subsystems:

    - ARM32 architecture;

    - PowerPC architecture;

    - x86 architecture;

    - DMA engine subsystem;

    - EFI core;

    - GPU drivers;

    - InfiniBand drivers;

    - Multiple devices driver;

    - Network drivers;

    - Power supply drivers;

    - TCM subsystem;

    - Userspace I/O drivers;

    - USB subsystem;

    - Framebuffer layer;

    - AFS file system;

    - File systems infrastructure;

    - BTRFS file system;

    - Ext4 file system;

    - Bluetooth subsystem;

    - Networking core;

    - IPv4 networking;

    - IPv6 networking;

    - L2TP protocol;

    - MAC80211 subsystem;

    - Netfilter;

    - Netlink;

    - Wireless networking; (CVE-2024-26748, CVE-2024-27417, CVE-2024-26840, CVE-2023-52504, CVE-2024-26790,
    CVE-2024-26763, CVE-2024-26805, CVE-2024-26773, CVE-2021-47063, CVE-2024-26791, CVE-2024-27413,
    CVE-2024-26788, CVE-2024-27405, CVE-2024-26845, CVE-2024-26766, CVE-2021-47070, CVE-2024-26839,
    CVE-2024-26712, CVE-2024-27412, CVE-2024-26752, CVE-2024-26778, CVE-2024-26735, CVE-2024-26736,
    CVE-2024-27410, CVE-2024-26779, CVE-2024-26804, CVE-2024-26749, CVE-2024-26793, CVE-2024-26764,
    CVE-2024-26751, CVE-2024-35811, CVE-2024-26835, CVE-2024-26772, CVE-2024-26777, CVE-2024-26688,
    CVE-2024-27416, CVE-2024-26801, CVE-2024-26733, CVE-2024-27414, CVE-2024-26754, CVE-2024-26848)

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-6831-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/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:L/AC:L/PR:L/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-2024-0841");

  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:"2024/01/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/06/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/06/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1045-xilinx-zynqmp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1073-ibm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1093-gkeop");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1110-raspi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1114-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1125-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1126-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1130-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1131-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-186-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-186-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-186-lowlatency");
  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", "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 (! ('18.04' >< os_release || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 18.04 / 20.04', '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 kernel_mappings = {
  '18.04': {
    '5.4.0': {
      'generic': '5.4.0-186',
      'lowlatency': '5.4.0-186',
      'ibm': '5.4.0-1073',
      'raspi': '5.4.0-1110',
      'oracle': '5.4.0-1125',
      'aws': '5.4.0-1126',
      'gcp': '5.4.0-1130',
      'azure': '5.4.0-1131'
    }
  },
  '20.04': {
    '5.4.0': {
      'generic': '5.4.0-186',
      'generic-lpae': '5.4.0-186',
      'lowlatency': '5.4.0-186',
      'xilinx-zynqmp': '5.4.0-1045',
      'ibm': '5.4.0-1073',
      'gkeop': '5.4.0-1093',
      'raspi': '5.4.0-1110',
      'kvm': '5.4.0-1114',
      'oracle': '5.4.0-1125',
      'aws': '5.4.0-1126',
      'gcp': '5.4.0-1130',
      'azure': '5.4.0-1131'
    }
  }
};

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 (deb_ver_cmp(ver1:host_kernel_release, ver2:kernel_fixed_version) < 0)
{
  extra = 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-6831-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2021-47063', 'CVE-2021-47070', 'CVE-2023-52504', 'CVE-2024-0841', 'CVE-2024-26688', 'CVE-2024-26712', 'CVE-2024-26733', 'CVE-2024-26735', 'CVE-2024-26736', 'CVE-2024-26748', 'CVE-2024-26749', 'CVE-2024-26751', 'CVE-2024-26752', 'CVE-2024-26754', 'CVE-2024-26763', 'CVE-2024-26764', 'CVE-2024-26766', 'CVE-2024-26772', 'CVE-2024-26773', 'CVE-2024-26777', 'CVE-2024-26778', 'CVE-2024-26779', 'CVE-2024-26788', 'CVE-2024-26790', 'CVE-2024-26791', 'CVE-2024-26793', 'CVE-2024-26801', 'CVE-2024-26804', 'CVE-2024-26805', 'CVE-2024-26835', 'CVE-2024-26839', 'CVE-2024-26840', 'CVE-2024-26845', 'CVE-2024-26848', 'CVE-2024-27405', 'CVE-2024-27410', 'CVE-2024-27412', 'CVE-2024-27413', 'CVE-2024-27414', 'CVE-2024-27416', 'CVE-2024-27417', 'CVE-2024-35811');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-6831-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}