Ubuntu 16.04 ESM / 18.04 LTS : Linux kernel vulnerabilities (USN-5136-1)

#%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-5136-1. 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(154972);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2019-19449",
    "CVE-2020-36322",
    "CVE-2020-36385",
    "CVE-2021-3655",
    "CVE-2021-3743",
    "CVE-2021-3753",
    "CVE-2021-3759",
    "CVE-2021-38199",
    "CVE-2021-42252"
  );
  script_xref(name:"USN", value:"5136-1");

  script_name(english:"Ubuntu 16.04 ESM / 18.04 LTS : Linux kernel vulnerabilities (USN-5136-1)");

  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 host has a package installed that is affected by multiple vulnerabilities as
referenced in the USN-5136-1 advisory.

    It was discovered that the f2fs file system in the Linux kernel did not properly validate metadata in some
    situations. An attacker could use this to construct a malicious f2fs image that, when mounted and operated
    on, could cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-19449)

    It was discovered that the FUSE user space file system implementation in the Linux kernel did not properly
    handle bad inodes in some situations. A local attacker could possibly use this to cause a denial of
    service. (CVE-2020-36322)

    It was discovered that the Infiniband RDMA userspace connection manager implementation in the Linux kernel
    contained a race condition leading to a use-after-free vulnerability. A local attacker could use this to
    cause a denial of service (system crash) or possible execute arbitrary code. (CVE-2020-36385)

    Ilja Van Sprundel discovered that the SCTP implementation in the Linux kernel did not properly perform
    size validations on incoming packets in some situations. An attacker could possibly use this to expose
    sensitive information (kernel memory). (CVE-2021-3655)

    It was discovered that the Qualcomm IPC Router protocol implementation in the Linux kernel did not
    properly validate metadata in some situations. A local attacker could use this to cause a denial of
    service (system crash) or expose sensitive information. (CVE-2021-3743)

    It was discovered that the virtual terminal (vt) device implementation in the Linux kernel contained a
    race condition in its ioctl handling that led to an out-of-bounds read vulnerability. A local attacker
    could possibly use this to expose sensitive information. (CVE-2021-3753)

    It was discovered that the Linux kernel did not properly account for the memory usage of certain IPC
    objects. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-3759)

    Michael Wakabayashi discovered that the NFSv4 client implementation in the Linux kernel did not properly
    order connection setup operations. An attacker controlling a remote NFS server could use this to cause a
    denial of service on the client. (CVE-2021-38199)

    It was discovered that the Aspeed Low Pin Count (LPC) Bus Controller implementation in the Linux kernel
    did not properly perform boundary checks in some situations, allowing out-of-bounds write access. A local
    attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. In
    Ubuntu, this issue only affected systems running armhf kernels. (CVE-2021-42252)

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-5136-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  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-2020-36385");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-42252");

  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:"2019/12/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/11/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/11/09");

  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:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1030-dell300x");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1083-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1098-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1102-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1111-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1115-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1115-snapdragon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1126-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-162-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-162-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-162-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) 2021-2024 Canonical, Inc. / NASL script (C) 2021-2024 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)) 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 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': '4.15.0-162',
      'lowlatency': '4.15.0-162',
      'oracle': '4.15.0-1083',
      'gcp': '4.15.0-1111',
      'aws': '4.15.0-1115',
      'azure': '4.15.0-1126'
    }
  },
  '18.04': {
    '4.15.0': {
      'generic': '4.15.0-162',
      'generic-lpae': '4.15.0-162',
      'lowlatency': '4.15.0-162',
      'dell300x': '4.15.0-1030',
      'oracle': '4.15.0-1083',
      'raspi2': '4.15.0-1098',
      'kvm': '4.15.0-1102',
      'gcp': '4.15.0-1111',
      'snapdragon': '4.15.0-1115',
      'azure': '4.15.0-1126'
    }
  }
};

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-5136-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2019-19449', 'CVE-2020-36322', 'CVE-2020-36385', 'CVE-2021-3655', 'CVE-2021-3743', 'CVE-2021-3753', 'CVE-2021-3759', 'CVE-2021-38199', 'CVE-2021-42252');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-5136-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}