Ubuntu 23.10 : Linux kernel (GCP) vulnerabilities (USN-6537-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6537-1. 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(186622);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/17");

  script_cve_id(
    "CVE-2023-4244",
    "CVE-2023-5090",
    "CVE-2023-5158",
    "CVE-2023-5178",
    "CVE-2023-5345",
    "CVE-2023-5633",
    "CVE-2023-5717",
    "CVE-2023-31085",
    "CVE-2023-39189",
    "CVE-2023-42754",
    "CVE-2023-45898"
  );
  script_xref(name:"USN", value:"6537-1");

  script_name(english:"Ubuntu 23.10 : Linux kernel (GCP) vulnerabilities (USN-6537-1)");

  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 23.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the
USN-6537-1 advisory.

  - An issue was discovered in drivers/mtd/ubi/cdev.c in the Linux kernel 6.2. There is a divide-by-zero error
    in do_div(sz,mtd->erasesize), used indirectly by ctrl_cdev_ioctl, when mtd->erasesize is 0.
    (CVE-2023-31085)

  - A flaw was found in the Netfilter subsystem in the Linux kernel. The nfnl_osf_add_callback function did
    not validate the user mode controlled opt_num field. This flaw allows a local privileged (CAP_NET_ADMIN)
    attacker to trigger an out-of-bounds read, leading to a crash or information disclosure. (CVE-2023-39189)

  - A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to
    achieve local privilege escalation. Due to a race condition between nf_tables netlink control plane
    transaction and nft_set element garbage collection, it is possible to underflow the reference counter
    causing a use-after-free vulnerability. We recommend upgrading past commit
    3e91b0ebd994635df2346353322ac51ce84ce6d8. (CVE-2023-4244)

  - A NULL pointer dereference flaw was found in the Linux kernel ipv4 stack. The socket buffer (skb) was
    assumed to be associated with a device before calling __ip_options_compile, which is not always the case
    if the skb is re-routed by ipvs. This issue may allow a local user with CAP_NET_ADMIN privileges to crash
    the system. (CVE-2023-42754)

  - The Linux kernel before 6.5.4 has an es1 use-after-free in fs/ext4/extents_status.c, related to
    ext4_es_insert_extent. (CVE-2023-45898)

  - A flaw was found in KVM. An improper check in svm_set_x2apic_msr_interception() may allow direct access to
    host x2apic msrs when the guest resets its apic, potentially leading to a denial of service condition.
    (CVE-2023-5090)

  - A flaw was found in vringh_kiov_advance in drivers/vhost/vringh.c in the host side of a virtio ring in the
    Linux Kernel. This issue may result in a denial of service from guest to host via zero length descriptor.
    (CVE-2023-5158)

  - A use-after-free vulnerability was found in drivers/nvme/target/tcp.c` in `nvmet_tcp_free_crypto` due to a
    logical bug in the NVMe-oF/TCP subsystem in the Linux kernel. This issue may allow a malicious local
    privileged user to cause a use-after-free and double-free problem, which may permit remote code execution
    or lead to local privilege escalation problem. (CVE-2023-5178)

  - A use-after-free vulnerability in the Linux kernel's fs/smb/client component can be exploited to achieve
    local privilege escalation. In case of an error in smb3_fs_context_parse_param, ctx->password was freed
    but the field was not set to NULL which could lead to double free. We recommend upgrading past commit
    e6e43b8aa7cd3c3af686caf0c2e11819a886d705. (CVE-2023-5345)

  - The reference count changes made as part of the CVE-2023-33951 and CVE-2023-33952 fixes exposed a use-
    after-free flaw in the way memory objects were handled when they were being used to store a surface. When
    running inside a VMware guest with 3D acceleration enabled, a local, unprivileged user could potentially
    use this flaw to escalate their privileges. (CVE-2023-5633)

  - A heap out-of-bounds write vulnerability in the Linux kernel's Linux Kernel Performance Events (perf)
    component can be exploited to achieve local privilege escalation. If perf_read_group() is called while an
    event's sibling_list is smaller than its child's sibling_list, it can increment or write to memory
    locations outside of the allocated buffer. We recommend upgrading past commit
    32671e3799ca2e4590773fd0e63aaa4229e50c06. (CVE-2023-5717)

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-6537-1");
  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-2023-5178");

  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:"2023/04/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/12/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/12/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:23.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.5.0-1010-gcp");
  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 (! ('23.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 23.10', '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 = {
  '23.10': {
    '6.5.0': {
      'gcp': '6.5.0-1010'
    }
  }
};

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-6537-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2023-4244', 'CVE-2023-5090', 'CVE-2023-5158', 'CVE-2023-5178', 'CVE-2023-5345', 'CVE-2023-5633', 'CVE-2023-5717', 'CVE-2023-31085', 'CVE-2023-39189', 'CVE-2023-42754', 'CVE-2023-45898');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-6537-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}