Ubuntu 16.04 ESM : Linux kernel vulnerabilities (USN-5299-1)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5299-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(158254);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/28");

  script_cve_id(
    "CVE-2020-26147",
    "CVE-2020-26558",
    "CVE-2021-0129",
    "CVE-2021-3483",
    "CVE-2021-3564",
    "CVE-2021-3612",
    "CVE-2021-3679",
    "CVE-2021-28972",
    "CVE-2021-33034",
    "CVE-2021-34693",
    "CVE-2021-38204",
    "CVE-2021-42008",
    "CVE-2021-45485"
  );
  script_xref(name:"USN", value:"5299-1");

  script_name(english:"Ubuntu 16.04 ESM : Linux kernel vulnerabilities (USN-5299-1)");

  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-5299-1 advisory.

    Mathy Vanhoef discovered that the Linux kernels WiFi implementation could reassemble mixed encrypted
    and plaintext fragments. A physically proximate attacker could possibly use this issue to inject packets
    or exfiltrate selected fragments. (CVE-2020-26147)

    It was discovered that the bluetooth subsystem in the Linux kernel did not properly perform access
    control. An authenticated attacker could possibly use this to expose sensitive information.
    (CVE-2020-26558, CVE-2021-0129)

    It was discovered that the RPA PCI Hotplug driver implementation in the Linux kernel did not properly
    handle device name writes via sysfs, leading to a buffer overflow. A privileged attacker could use this to
    cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-28972)

    It was discovered that a use-after-free existed in the Bluetooth HCI driver of the Linux kernel. A local
    attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2021-33034)

    Norbert Slusarek discovered that the CAN broadcast manger (bcm) protocol implementation in the Linux
    kernel did not properly initialize memory in some situations. A local attacker could use this to expose
    sensitive information (kernel memory). (CVE-2021-34693)

     discovered that the IEEE 1394 (Firewire) nosy packet sniffer driver in the Linux kernel did not
    properly perform reference counting in some situations, leading to a use-after-free vulnerability. A local
    attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2021-3483)

    It was discovered that the bluetooth subsystem in the Linux kernel did not properly handle HCI device
    initialization failure, leading to a double-free vulnerability. An attacker could use this to cause a
    denial of service or possibly execute arbitrary code. (CVE-2021-3564)

    Murray McAllister discovered that the joystick device interface in the Linux kernel did not properly
    validate data passed via an ioctl(). A local attacker could use this to cause a denial of service (system
    crash) or possibly execute arbitrary code on systems with a joystick device registered. (CVE-2021-3612)

    It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu
    ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679)

    It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle
    device removal events. A physically proximate attacker could use this to cause a denial of service (system
    crash). (CVE-2021-38204)

    It was discovered that the 6pack network protocol driver in the Linux kernel did not properly perform
    validation checks. A privileged attacker could use this to cause a denial of service (system crash) or
    execute arbitrary code. (CVE-2021-42008)

    Amit Klein discovered that the IPv6 implementation in the Linux kernel could disclose internal state in
    some situations. An attacker could possibly use this to expose sensitive information. (CVE-2021-45485)

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-5299-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3612");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-42008");

  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:"2021/03/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/02/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/22");

  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-4.4.0-1100-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1135-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-219-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-219-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) 2022-2024 Canonical, Inc. / NASL script (C) 2022-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("linux_alt_patch_detect.nasl", "ssh_get_info.nasl", "ubuntu_pro_sub_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': {
    '4.4.0': {
      'generic': '4.4.0-219',
      'lowlatency': '4.4.0-219',
      'kvm': '4.4.0-1100',
      'aws': '4.4.0-1135'
    }
  }
};

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-5299-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2020-26147', 'CVE-2020-26558', 'CVE-2021-0129', 'CVE-2021-3483', 'CVE-2021-3564', 'CVE-2021-3612', 'CVE-2021-3679', 'CVE-2021-28972', 'CVE-2021-33034', 'CVE-2021-34693', 'CVE-2021-38204', 'CVE-2021-42008', 'CVE-2021-45485');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-5299-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}