Ubuntu 22.04 LTS : Linux kernel (OEM) vulnerabilities (USN-6343-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6343-1. 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(180545);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/28");

  script_cve_id(
    "CVE-2023-1206",
    "CVE-2023-4128",
    "CVE-2023-4155",
    "CVE-2023-4194",
    "CVE-2023-4273",
    "CVE-2023-34319",
    "CVE-2023-40283"
  );
  script_xref(name:"USN", value:"6343-1");

  script_name(english:"Ubuntu 22.04 LTS : Linux kernel (OEM) vulnerabilities (USN-6343-1)");

  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 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-6343-1 advisory.

    It was discovered that the IPv6 implementation in the Linux kernel contained a high rate of hash
    collisions in connection lookup table. A remote attacker could use this to cause a denial of service
    (excessive CPU consumption). (CVE-2023-1206)

    Ross Lagerwall discovered that the Xen netback backend driver in the Linux kernel did not properly handle
    certain unusual packets from a paravirtualized network frontend, leading to a buffer overflow. An attacker
    in a guest VM could use this to cause a denial of service (host system crash) or possibly execute
    arbitrary code. (CVE-2023-34319)

    It was discovered that the bluetooth subsystem in the Linux kernel did not properly handle L2CAP socket
    release, 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-2023-40283)

    It was discovered that some network classifier implementations in the Linux kernel contained use-after-
    free vulnerabilities. A local attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2023-4128)

    Andy Nguyen discovered that the KVM implementation for AMD processors in the Linux kernel with Secure
    Encrypted Virtualization (SEV) contained a race condition when accessing the GHCB page. A local attacker
    in a SEV guest VM could possibly use this to cause a denial of service (host system crash).
    (CVE-2023-4155)

    It was discovered that the TUN/TAP driver in the Linux kernel did not properly initialize socket data. A
    local attacker could use this to cause a denial of service (system crash). (CVE-2023-4194)

    Maxim Suhanov discovered that the exFAT file system implementation in the Linux kernel did not properly
    check a file name length, leading to an out- of-bounds write vulnerability. An attacker could use this to
    construct a malicious exFAT image that, when mounted and operated on, could cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2023-4273)

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-6343-1");
  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: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-2023-40283");

  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:"2023/06/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/09/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/09/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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-6.1.0-1021-oem");
  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", "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 (! ('22.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 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 = {
  '22.04': {
    '6.1.0': {
      'oem': '6.1.0-1021'
    }
  }
};

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-6343-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2023-1206', 'CVE-2023-4128', 'CVE-2023-4155', 'CVE-2023-4194', 'CVE-2023-4273', 'CVE-2023-34319', 'CVE-2023-40283');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-6343-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}