Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel (Azure) vulnerabilities (USN-6866-2)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6866-2. 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(201897);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/07/04");

  script_cve_id(
    "CVE-2021-33631",
    "CVE-2021-47063",
    "CVE-2023-6270",
    "CVE-2023-52615",
    "CVE-2024-2201",
    "CVE-2024-23307",
    "CVE-2024-24861",
    "CVE-2024-26642",
    "CVE-2024-26720",
    "CVE-2024-26736",
    "CVE-2024-26898",
    "CVE-2024-26922"
  );
  script_xref(name:"USN", value:"6866-2");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel (Azure) vulnerabilities (USN-6866-2)");

  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 LTS / 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as
referenced in the USN-6866-2 advisory.

    It was discovered that the ext4 file system implementation in the Linux kernel did not properly validate
    data state on write operations. An attacker could use this to construct a malicious ext4 file system image
    that, when mounted, could cause a denial of service (system crash). (CVE-2021-33631)

    It was discovered that the ATA over Ethernet (AoE) driver in the Linux kernel contained a race condition,
    leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service or
    possibly execute arbitrary code. (CVE-2023-6270)

    Sander Wiebing, Alvise de Faveri Tron, Herbert Bos, and Cristiano Giuffrida discovered that the Linux
    kernel mitigations for the initial Branch History Injection vulnerability (CVE-2022-0001) were
    insufficient for Intel processors. A local attacker could potentially use this to expose sensitive
    information. (CVE-2024-2201)

    Gui-Dong Han discovered that the software RAID driver in the Linux kernel contained a race condition,
    leading to an integer overflow vulnerability. A privileged attacker could possibly use this to cause a
    denial of service (system crash). (CVE-2024-23307)

    Bai Jiaju discovered that the Xceive XC4000 silicon tuner device driver in the Linux kernel contained a
    race condition, leading to an integer overflow vulnerability. An attacker could possibly use this to cause
    a denial of service (system crash). (CVE-2024-24861)

    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:

    - Block layer subsystem;

    - Hardware random number generator core;

    - GPU drivers;

    - AFS file system;

    - Memory management;

    - Netfilter; (CVE-2024-26642, CVE-2024-26922, CVE-2024-26720, CVE-2024-26736, CVE-2024-26898,
    CVE-2021-47063, CVE-2023-52615)

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-6866-2");
  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-2024-26898");

  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:"2024/01/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/07/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/07/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1178-azure");
  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 (! ('16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04', '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 = {
  '16.04': {
    '4.15.0': {
      'azure': '4.15.0-1178'
    }
  },
  '18.04': {
    '4.15.0': {
      'azure': '4.15.0-1178'
    }
  }
};

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-6866-2');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2021-33631', 'CVE-2021-47063', 'CVE-2023-6270', 'CVE-2023-52615', 'CVE-2024-2201', 'CVE-2024-23307', 'CVE-2024-24861', 'CVE-2024-26642', 'CVE-2024-26720', 'CVE-2024-26736', 'CVE-2024-26898', 'CVE-2024-26922');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-6866-2');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}