Ubuntu 22.04 LTS / 23.04 : Linux kernel vulnerabilities (USN-6412-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6412-1. 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(182530);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");

  script_cve_id(
    "CVE-2022-45886",
    "CVE-2022-45887",
    "CVE-2022-45919",
    "CVE-2022-48425",
    "CVE-2023-1206",
    "CVE-2023-2156",
    "CVE-2023-3212",
    "CVE-2023-4155",
    "CVE-2023-4194",
    "CVE-2023-4273",
    "CVE-2023-20569",
    "CVE-2023-38427",
    "CVE-2023-38431"
  );
  script_xref(name:"USN", value:"6412-1");

  script_name(english:"Ubuntu 22.04 LTS / 23.04 : Linux kernel vulnerabilities (USN-6412-1)");

  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 / 23.04 host has a package installed that is affected by multiple vulnerabilities as
referenced in the USN-6412-1 advisory.

  - An issue was discovered in the Linux kernel through 6.0.9. drivers/media/dvb-core/dvb_net.c has a
    .disconnect versus dvb_device_open race condition that leads to a use-after-free. (CVE-2022-45886)

  - An issue was discovered in the Linux kernel through 6.0.9. drivers/media/usb/ttusb-dec/ttusb_dec.c has a
    memory leak because of the lack of a dvb_frontend_detach call. (CVE-2022-45887)

  - An issue was discovered in the Linux kernel through 6.0.10. In drivers/media/dvb-core/dvb_ca_en50221.c, a
    use-after-free can occur is there is a disconnect after an open, because of the lack of a wait_event.
    (CVE-2022-45919)

  - In the Linux kernel through 6.2.7, fs/ntfs3/inode.c has an invalid kfree because it does not validate MFT
    flags before replaying logs. (CVE-2022-48425)

  - A hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel's IPv6
    functionality when a user makes a new kind of SYN flood attack. A user located in the local network or
    with a high bandwidth connection can increase the CPU usage of the server that accepts IPV6 connections up
    to 95%. (CVE-2023-1206)

  - A side channel vulnerability on some of the AMD CPUs may allow an attacker to influence the return address
    prediction. This may result in speculative execution at an attacker-controlled address, potentially
    leading to information disclosure. (CVE-2023-20569)

  - A flaw was found in the networking subsystem of the Linux kernel within the handling of the RPL protocol.
    This issue results from the lack of proper handling of user-supplied data, which can lead to an assertion
    failure. This may allow an unauthenticated remote attacker to create a denial of service condition on the
    system. (CVE-2023-2156)

  - A NULL pointer dereference issue was found in the gfs2 file system in the Linux kernel. It occurs on
    corrupt gfs2 file systems when the evict code tries to reference the journal descriptor structure after it
    has been freed and set to NULL. A privileged local user could use this flaw to cause a kernel panic.
    (CVE-2023-3212)

  - An issue was discovered in the Linux kernel before 6.3.8. fs/smb/server/smb2pdu.c in ksmbd has an integer
    underflow and out-of-bounds read in deassemble_neg_contexts. (CVE-2023-38427)

  - An issue was discovered in the Linux kernel before 6.3.8. fs/smb/server/connection.c in ksmbd does not
    validate the relationship between the NetBIOS header's length field and the SMB header sizes, via pdu_size
    in ksmbd_conn_handler_loop, leading to an out-of-bounds read. (CVE-2023-38431)

  - A flaw was found in KVM AMD Secure Encrypted Virtualization (SEV) in the Linux kernel. A KVM guest using
    SEV-ES or SEV-SNP with multiple vCPUs can trigger a double fetch race condition vulnerability and invoke
    the `VMGEXIT` handler recursively. If an attacker manages to call the handler multiple times, they can
    trigger a stack overflow and cause a denial of service or potentially guest-to-host escape in kernel
    configurations without stack guard pages (`CONFIG_VMAP_STACK`). (CVE-2023-4155)

  - A flaw was found in the Linux kernel's TUN/TAP functionality. This issue could allow a local user to
    bypass network filters and gain unauthorized access to some resources. The original patches fixing
    CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits -
    a096ccca6e50 (tun: tun_chr_open(): correctly initialize socket uid), - 66b2c338adce (tap: tap_open():
    correctly initialize socket uid), pass inode->i_uid to sock_init_data_uid() as the last parameter and
    that turns out to not be accurate. (CVE-2023-4194)

  - A flaw was found in the exFAT driver of the Linux kernel. The vulnerability exists in the implementation
    of the file name reconstruction function, which is responsible for reading file name entries from a
    directory index and merging file name parts belonging to one file into a single long file name. Since the
    file name characters are copied into a stack variable, a local privileged attacker could use this flaw to
    overflow the kernel stack. (CVE-2023-4273)

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-6412-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:N/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:N/AC:L/PR:N/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-2023-38427");

  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:"2022/11/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/10/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/04");

  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:"cpe:/o:canonical:ubuntu_linux:23.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1006-starfive");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1013-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1013-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1014-azure-fde");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1014-raspi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1016-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-34-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-34-generic-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-34-generic-lpae");
  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 || '23.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 23.04', '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': {
    '6.2.0': {
      'generic': '6.2.0-34',
      'generic-64k': '6.2.0-34',
      'generic-lpae': '6.2.0-34',
      'aws': '6.2.0-1013',
      'azure-fde': '6.2.0-1014',
      'gcp': '6.2.0-1016'
    }
  },
  '23.04': {
    '6.2.0': {
      'generic': '6.2.0-34',
      'generic-64k': '6.2.0-34',
      'generic-lpae': '6.2.0-34',
      'starfive': '6.2.0-1006',
      'aws': '6.2.0-1013',
      'oracle': '6.2.0-1013',
      'raspi': '6.2.0-1014',
      'gcp': '6.2.0-1016'
    }
  }
};

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 = 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-6412-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2022-45886', 'CVE-2022-45887', 'CVE-2022-45919', 'CVE-2022-48425', 'CVE-2023-1206', 'CVE-2023-2156', 'CVE-2023-3212', 'CVE-2023-4155', 'CVE-2023-4194', 'CVE-2023-4273', 'CVE-2023-20569', 'CVE-2023-38427', 'CVE-2023-38431');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-6412-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}