Ubuntu 22.04 LTS : Linux kernel vulnerabilities (USN-6626-2)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6626-2. 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(190518);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/14");

  script_cve_id(
    "CVE-2023-6039",
    "CVE-2023-6176",
    "CVE-2023-6622",
    "CVE-2023-32250",
    "CVE-2023-32252",
    "CVE-2023-32257",
    "CVE-2023-34324",
    "CVE-2023-35827",
    "CVE-2023-46813",
    "CVE-2024-0641"
  );
  script_xref(name:"USN", value:"6626-2");

  script_name(english:"Ubuntu 22.04 LTS : Linux kernel vulnerabilities (USN-6626-2)");

  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 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-6626-2 advisory.

  - A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw
    exists within the processing of SMB2_SESSION_SETUP commands. The issue results from the lack of proper
    locking when performing operations on an object. An attacker can leverage this vulnerability to execute
    code in the context of the kernel. (CVE-2023-32250)

  - A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw
    exists within the handling of SMB2_LOGOFF commands. The issue results from the lack of proper validation
    of a pointer prior to accessing it. An attacker can leverage this vulnerability to create a denial-of-
    service condition on the system. (CVE-2023-32252)

  - A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw
    exists within the processing of SMB2_SESSION_SETUP and SMB2_LOGOFF commands. The issue results from the
    lack of proper locking when performing operations on an object. An attacker can leverage this
    vulnerability to execute code in the context of the kernel. (CVE-2023-32257)

  - Closing of an event channel in the Linux kernel can result in a deadlock. This happens when the close is
    being performed in parallel to an unrelated Xen console action and the handling of a Xen console interrupt
    in an unprivileged guest. The closing of an event channel is e.g. triggered by removal of a paravirtual
    device on the other side. As this action will cause console messages to be issued on the other side quite
    often, the chance of triggering the deadlock is not neglectable. Note that 32-bit Arm-guests are not
    affected, as the 32-bit Linux kernel on Arm doesn't use queued-RW-locks, which are required to trigger the
    issue (on Arm32 a waiting writer doesn't block further readers to get the lock). (CVE-2023-34324)

  - An issue was discovered in the Linux kernel through 6.3.8. A use-after-free was found in ravb_remove in
    drivers/net/ethernet/renesas/ravb_main.c. (CVE-2023-35827)

  - An issue was discovered in the Linux kernel before 6.5.9, exploitable by local users with userspace access
    to MMIO registers. Incorrect access checking in the #VC handler and instruction emulation of the SEV-ES
    emulation of MMIO accesses could lead to arbitrary write access to kernel memory (and thus privilege
    escalation). This depends on a race condition through which userspace can replace an instruction before
    the #VC handler reads it. (CVE-2023-46813)

  - A use-after-free flaw was found in lan78xx_disconnect in drivers/net/usb/lan78xx.c in the network sub-
    component, net/usb/lan78xx in the Linux Kernel. This flaw allows a local attacker to crash the system when
    the LAN78XX USB device detaches. (CVE-2023-6039)

  - A null pointer dereference flaw was found in the Linux kernel API for the cryptographic algorithm
    scatterwalk functionality. This issue occurs when a user constructs a malicious packet with specific
    socket configuration, which could allow a local user to crash the system or escalate their privileges on
    the system. (CVE-2023-6176)

  - A null pointer dereference vulnerability was found in nft_dynset_init() in net/netfilter/nft_dynset.c in
    nf_tables in the Linux kernel. This issue may allow a local attacker with CAP_NET_ADMIN user privilege to
    trigger a denial of service. (CVE-2023-6622)

  - A denial of service vulnerability was found in tipc_crypto_key_revoke in net/tipc/crypto.c in the Linux
    kernel's TIPC subsystem. This flaw allows guests with local user privileges to trigger a deadlock and
    potentially crash the system. (CVE-2024-0641)

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-6626-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-32257");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/06/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/02/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/02/14");

  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-5.15.0-1046-raspi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-94-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-94-lowlatency-64k");
  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) 2024 Canonical, Inc. / NASL script (C) 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': {
    '5.15.0': {
      'lowlatency': '5.15.0-94',
      'lowlatency-64k': '5.15.0-94',
      'raspi': '5.15.0-1046'
    }
  }
};

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-6626-2');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2023-6039', 'CVE-2023-6176', 'CVE-2023-6622', 'CVE-2023-32250', 'CVE-2023-32252', 'CVE-2023-32257', 'CVE-2023-34324', 'CVE-2023-35827', 'CVE-2023-46813', 'CVE-2024-0641');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-6626-2');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}