Ubuntu 18.04 ESM / 20.04 LTS : Linux kernel vulnerabilities (USN-6548-2)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6548-2. 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(186793);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2023-3006",
    "CVE-2023-5178",
    "CVE-2023-5717",
    "CVE-2023-6176",
    "CVE-2023-37453",
    "CVE-2023-39189",
    "CVE-2023-39192",
    "CVE-2023-39193",
    "CVE-2023-39194",
    "CVE-2023-42754"
  );
  script_xref(name:"USN", value:"6548-2");

  script_name(english:"Ubuntu 18.04 ESM / 20.04 LTS : Linux kernel vulnerabilities (USN-6548-2)");

  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 18.04 ESM / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as
referenced in the USN-6548-2 advisory.

    It was discovered that Spectre-BHB mitigations were missing for Ampere processors. A local attacker could
    potentially use this to expose sensitive information. (CVE-2023-3006)

    It was discovered that the USB subsystem in the Linux kernel contained a race condition while handling
    device descriptors in certain situations, leading to a out-of-bounds read vulnerability. A local attacker
    could possibly use this to cause a denial of service (system crash). (CVE-2023-37453)

    Lucas Leong discovered that the netfilter subsystem in the Linux kernel did not properly validate some
    attributes passed from userspace. A local attacker could use this to cause a denial of service (system
    crash) or possibly expose sensitive information (kernel memory). (CVE-2023-39189)

    Sunjoo Park discovered that the netfilter subsystem in the Linux kernel did not properly validate u32
    packets content, leading to an out-of-bounds read vulnerability. A local attacker could use this to cause
    a denial of service (system crash) or possibly expose sensitive information. (CVE-2023-39192)

    Lucas Leong discovered that the netfilter subsystem in the Linux kernel did not properly validate SCTP
    data, leading to an out-of-bounds read vulnerability. A local attacker could use this to cause a denial of
    service (system crash) or possibly expose sensitive information. (CVE-2023-39193)

    Lucas Leong discovered that the Netlink Transformation (XFRM) subsystem in the Linux kernel did not
    properly handle state filters, leading to an out- of-bounds read vulnerability. A privileged local
    attacker could use this to cause a denial of service (system crash) or possibly expose sensitive
    information. (CVE-2023-39194)

    Kyle Zeng discovered that the IPv4 implementation in the Linux kernel did not properly handle socket
    buffers (skb) when performing IP routing in certain circumstances, leading to a null pointer dereference
    vulnerability. A privileged attacker could use this to cause a denial of service (system crash).
    (CVE-2023-42754)

    Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly handle queue
    initialization failures in certain situations, leading to a use-after-free vulnerability. A remote
    attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2023-5178)

    Budimir Markovic discovered that the perf subsystem in the Linux kernel did not properly handle event
    groups, leading to an out-of-bounds write vulnerability. A local attacker could use this to cause a denial
    of service (system crash) or possibly execute arbitrary code. (CVE-2023-5717)

    It was discovered that the TLS subsystem in the Linux kernel did not properly perform cryptographic
    operations in some situations, leading to a null pointer dereference vulnerability. A local attacker could
    use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-6176)

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-6548-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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:N/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-2023-5178");

  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:"2023/05/31");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/12/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/12/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:esm");
  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-5.4.0-1100-raspi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1115-oracle");
  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) 2023-2024 Canonical, Inc. / NASL script (C) 2023-2024 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 (! ('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 ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var kernel_mappings = {
  '18.04': {
    '5.4.0': {
      'raspi': '5.4.0-1100',
      'oracle': '5.4.0-1115'
    }
  },
  '20.04': {
    '5.4.0': {
      'raspi': '5.4.0-1100'
    }
  }
};

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-6548-2');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2023-3006', 'CVE-2023-5178', 'CVE-2023-5717', 'CVE-2023-6176', 'CVE-2023-37453', 'CVE-2023-39189', 'CVE-2023-39192', 'CVE-2023-39193', 'CVE-2023-39194', 'CVE-2023-42754');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-6548-2');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}