Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel vulnerabilities (USN-5566-1)

##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5566-1. 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(164030);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2022-1652",
    "CVE-2022-1679",
    "CVE-2022-2585",
    "CVE-2022-2586",
    "CVE-2022-2588",
    "CVE-2022-28893",
    "CVE-2022-29900",
    "CVE-2022-29901",
    "CVE-2022-34918"
  );
  script_xref(name:"USN", value:"5566-1");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2024/07/17");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel vulnerabilities (USN-5566-1)");

  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 20.04 LTS / 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as
referenced in the USN-5566-1 advisory.

    Zhenpeng Lin discovered that the network packet scheduler implementation in the Linux kernel did not
    properly remove all references to a route filter before freeing it in some situations. A local attacker
    could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2022-2588)

    It was discovered that the netfilter subsystem of the Linux kernel did not prevent one nft object from
    referencing an nft set in another nft table, leading to a use-after-free vulnerability. A local attacker
    could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2022-2586)

    It was discovered that the implementation of POSIX timers in the Linux kernel did not properly clean up
    timers in some situations. A local attacker could use this to cause a denial of service (system crash) or
    execute arbitrary code. (CVE-2022-2585)

    Minh Yuan discovered that the floppy disk driver in the Linux kernel contained a race condition, leading
    to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service
    (system crash) or execute arbitrary code. (CVE-2022-1652)

    It was discovered that the Atheros ath9k wireless device driver in the Linux kernel did not properly
    handle some error conditions, 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-2022-1679)

    Felix Fu discovered that the Sun RPC implementation in the Linux kernel did not properly handle socket
    states, leading to a use-after-free vulnerability. A remote attacker could possibly use this to cause a
    denial of service (system crash) or execute arbitrary code. (CVE-2022-28893)

    Johannes Wikner and Kaveh Razavi discovered that for some AMD x86-64 processors, the branch predictor
    could by mis-trained for return instructions in certain circumstances. A local attacker could possibly use
    this to expose sensitive information. (CVE-2022-29900)

    Johannes Wikner and Kaveh Razavi discovered that for some Intel x86-64 processors, the Linux kernel's
    protections against speculative branch target injection attacks were insufficient in some circumstances. A
    local attacker could possibly use this to expose sensitive information. (CVE-2022-29901)

    Arthur Mongodin discovered that the netfilter subsystem in the Linux kernel did not properly perform data
    validation. A local attacker could use this to escalate privileges in certain situations. (CVE-2022-34918)

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-5566-1");
  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:H/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:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-34918");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Netfilter nft_set_elem_init Heap Overflow Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/04/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/08/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/08/10");

  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-5.15.0-1012-ibm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1013-raspi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1013-raspi-nolpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1014-gke");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1016-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1017-aws");
  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("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 (! ('20.04' >< os_release || '22.04' >< 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$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var kernel_mappings = {
  '20.04': {
    '5.15.0': {
      'gke': '5.15.0-1014',
      'gcp': '5.15.0-1016',
      'aws': '5.15.0-1017'
    }
  },
  '22.04': {
    '5.15.0': {
      'ibm': '5.15.0-1012',
      'raspi': '5.15.0-1013',
      'raspi-nolpae': '5.15.0-1013',
      'gke': '5.15.0-1014',
      'gcp': '5.15.0-1016',
      'aws': '5.15.0-1017'
    }
  }
};

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 += '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-5566-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2022-1652', 'CVE-2022-1679', 'CVE-2022-2585', 'CVE-2022-2586', 'CVE-2022-2588', 'CVE-2022-28893', 'CVE-2022-29900', 'CVE-2022-29901', 'CVE-2022-34918');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-5566-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}