Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel (GCP) vulnerabilities (USN-6701-2)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6701-2. 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(192318);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/30");

  script_cve_id(
    "CVE-2023-2002",
    "CVE-2023-3006",
    "CVE-2023-4132",
    "CVE-2023-6121",
    "CVE-2023-23000",
    "CVE-2023-34256",
    "CVE-2023-39197",
    "CVE-2023-46838",
    "CVE-2023-51781",
    "CVE-2024-0775",
    "CVE-2024-1086",
    "CVE-2024-24855"
  );
  script_xref(name:"USN", value:"6701-2");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2024/06/20");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel (GCP) vulnerabilities (USN-6701-2)");

  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 16.04 LTS / 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as
referenced in the USN-6701-2 advisory.

  - A vulnerability was found in the HCI sockets implementation due to a missing capability check in
    net/bluetooth/hci_sock.c in the Linux Kernel. This flaw allows an attacker to unauthorized execution of
    management commands, compromising the confidentiality, integrity, and availability of Bluetooth
    communication. (CVE-2023-2002)

  - In the Linux kernel before 5.17, drivers/phy/tegra/xusb.c mishandles the tegra_xusb_find_port_node return
    value. Callers expect NULL in the error case, but an error pointer is used. (CVE-2023-23000)

  - A known cache speculation vulnerability, known as Branch History Injection (BHI) or Spectre-BHB, becomes
    actual again for the new hw AmpereOne. Spectre-BHB is similar to Spectre v2, except that malicious code
    uses the shared branch history (stored in the CPU Branch History Buffer, or BHB) to influence mispredicted
    branches within the victim's hardware context. Once that occurs, speculation caused by the mispredicted
    branches can cause cache allocation. This issue leads to obtaining information that should not be
    accessible. (CVE-2023-3006)

  - An issue was discovered in the Linux kernel before 6.3.3. There is an out-of-bounds read in crc16 in
    lib/crc16.c when called from fs/ext4/super.c because ext4_group_desc_csum does not properly check an
    offset. NOTE: this is disputed by third parties because the kernel is not intended to defend against
    attackers with the stated When modifying the block device while it is mounted by the filesystem access.
    (CVE-2023-34256)

  - An out-of-bounds read vulnerability was found in Netfilter Connection Tracking (conntrack) in the Linux
    kernel. This flaw allows a remote user to disclose sensitive information via the DCCP protocol.
    (CVE-2023-39197)

  - A use-after-free vulnerability was found in the siano smsusb module in the Linux kernel. The bug occurs
    during device initialization when the siano device is plugged in. This flaw allows a local user to crash
    the system, causing a denial of service condition. (CVE-2023-4132)

  - Transmit requests in Xen's virtual network protocol can consist of multiple parts. While not really
    useful, except for the initial part any of them may be of zero length, i.e. carry no data at all. Besides
    a certain initial portion of the to be transferred data, these parts are directly translated into what
    Linux calls SKB fragments. Such converted request parts can, when for a particular SKB they are all of
    length zero, lead to a de-reference of NULL in core networking code. (CVE-2023-46838)

  - An issue was discovered in the Linux kernel before 6.6.8. atalk_ioctl in net/appletalk/ddp.c has a use-
    after-free because of an atalk_recvmsg race condition. (CVE-2023-51781)

  - An out-of-bounds read vulnerability was found in the NVMe-oF/TCP subsystem in the Linux kernel. This issue
    may allow a remote attacker to send a crafted TCP packet, triggering a heap-based buffer overflow that
    results in kmalloc data being printed and potentially leaked to the kernel ring buffer (dmesg).
    (CVE-2023-6121)

  - A use-after-free flaw was found in the __ext4_remount in fs/ext4/super.c in ext4 in the Linux kernel. This
    flaw allows a local user to cause an information leak problem while freeing the old quota file names
    before a potential failure, leading to a use-after-free. (CVE-2024-0775)

  - A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to
    achieve local privilege escalation. The nft_verdict_init() function allows positive values as drop error
    within the hook verdict, and hence the nf_hook_slow() function can cause a double free vulnerability when
    NF_DROP is issued with a drop error which resembles NF_ACCEPT. We recommend upgrading past commit
    f342de4e2f33e0e39165d8639387aa6c19dff660. (CVE-2024-1086)

  - A race condition was found in the Linux kernel's scsi device driver in lpfc_unregister_fcf_rescan()
    function. This can result in a null pointer dereference issue, possibly leading to a kernel panic or
    denial of service issue. (CVE-2024-24855)

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-6701-2");
  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:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:H/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:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-39197");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2024-1086");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/03/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/03/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/03/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1160-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) 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 (! ('16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04', '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 = {
  '16.04': {
    '4.15.0': {
      'gcp': '4.15.0-1160'
    }
  },
  '18.04': {
    '4.15.0': {
      'gcp': '4.15.0-1160'
    }
  }
};

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-6701-2');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2023-2002', 'CVE-2023-3006', 'CVE-2023-4132', 'CVE-2023-6121', 'CVE-2023-23000', 'CVE-2023-34256', 'CVE-2023-39197', 'CVE-2023-46838', 'CVE-2023-51781', 'CVE-2024-0775', 'CVE-2024-1086', 'CVE-2024-24855');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-6701-2');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}