Ubuntu 18.04 LTS : Linux kernel vulnerabilities (USN-4258-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4258-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('compat.inc');

if (description)
{
  script_id(133354);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");

  script_cve_id(
    "CVE-2019-15099",
    "CVE-2019-15291",
    "CVE-2019-18683",
    "CVE-2019-18885",
    "CVE-2019-19050",
    "CVE-2019-19062",
    "CVE-2019-19071",
    "CVE-2019-19077",
    "CVE-2019-19078",
    "CVE-2019-19079",
    "CVE-2019-19082",
    "CVE-2019-19227",
    "CVE-2019-19252",
    "CVE-2019-19332",
    "CVE-2019-19767"
  );
  script_xref(name:"USN", value:"4258-1");

  script_name(english:"Ubuntu 18.04 LTS : Linux kernel vulnerabilities (USN-4258-1)");

  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 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-4258-1 advisory.

  - drivers/net/wireless/ath/ath10k/usb.c in the Linux kernel through 5.2.8 has a NULL pointer dereference via
    an incomplete address in an endpoint descriptor. (CVE-2019-15099)

  - An issue was discovered in the Linux kernel through 5.2.9. There is a NULL pointer dereference caused by a
    malicious USB device in the flexcop_usb_probe function in the drivers/media/usb/b2c2/flexcop-usb.c driver.
    (CVE-2019-15291)

  - An issue was discovered in drivers/media/platform/vivid in the Linux kernel through 5.3.8. It is
    exploitable for privilege escalation on some Linux distributions where local users have /dev/video0
    access, but only if the driver happens to be loaded. There are multiple race conditions during streaming
    stopping in this driver (part of the V4L2 subsystem). These issues are caused by wrong mutex locking in
    vivid_stop_generating_vid_cap(), vivid_stop_generating_vid_out(), sdr_cap_stop_streaming(), and the
    corresponding kthreads. At least one of these race conditions leads to a use-after-free. (CVE-2019-18683)

  - fs/btrfs/volumes.c in the Linux kernel before 5.1 allows a btrfs_verify_dev_extents NULL pointer
    dereference via a crafted btrfs image because fs_devices->devices is mishandled within find_device, aka
    CID-09ba3bc9dd15. (CVE-2019-18885)

  - A memory leak in the crypto_reportstat() function in crypto/crypto_user_stat.c in the Linux kernel through
    5.3.11 allows attackers to cause a denial of service (memory consumption) by triggering
    crypto_reportstat_alg() failures, aka CID-c03b04dcdba1. (CVE-2019-19050)

  - A memory leak in the crypto_report() function in crypto/crypto_user_base.c in the Linux kernel through
    5.3.11 allows attackers to cause a denial of service (memory consumption) by triggering
    crypto_report_alg() failures, aka CID-ffdde5932042. (CVE-2019-19062)

  - A memory leak in the rsi_send_beacon() function in drivers/net/wireless/rsi/rsi_91x_mgmt.c in the Linux
    kernel through 5.3.11 allows attackers to cause a denial of service (memory consumption) by triggering
    rsi_prepare_beacon() failures, aka CID-d563131ef23c. (CVE-2019-19071)

  - A memory leak in the bnxt_re_create_srq() function in drivers/infiniband/hw/bnxt_re/ib_verbs.c in the
    Linux kernel through 5.3.11 allows attackers to cause a denial of service (memory consumption) by
    triggering copy to udata failures, aka CID-4a9d46a9fe14. (CVE-2019-19077)

  - A memory leak in the ath10k_usb_hif_tx_sg() function in drivers/net/wireless/ath/ath10k/usb.c in the Linux
    kernel through 5.3.11 allows attackers to cause a denial of service (memory consumption) by triggering
    usb_submit_urb() failures, aka CID-b8d17e7d93d2. (CVE-2019-19078)

  - A memory leak in the qrtr_tun_write_iter() function in net/qrtr/tun.c in the Linux kernel before 5.3
    allows attackers to cause a denial of service (memory consumption), aka CID-a21b7f0cff19. (CVE-2019-19079)

  - Memory leaks in *create_resource_pool() functions under drivers/gpu/drm/amd/display/dc in the Linux kernel
    through 5.3.11 allow attackers to cause a denial of service (memory consumption). This affects the
    dce120_create_resource_pool() function in drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c, the
    dce110_create_resource_pool() function in drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c, the
    dce100_create_resource_pool() function in drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c, the
    dcn10_create_resource_pool() function in drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c, and the
    dce112_create_resource_pool() function in drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c, aka
    CID-104c307147ad. (CVE-2019-19082)

  - In the AppleTalk subsystem in the Linux kernel before 5.1, there is a potential NULL pointer dereference
    because register_snap_client may return NULL. This will lead to denial of service in net/appletalk/aarp.c
    and net/appletalk/ddp.c, as demonstrated by unregister_snap_client, aka CID-9804501fa122. (CVE-2019-19227)

  - vcs_write in drivers/tty/vt/vc_screen.c in the Linux kernel through 5.3.13 does not prevent write access
    to vcsu devices, aka CID-0c9acb1af77a. (CVE-2019-19252)

  - An out-of-bounds memory write issue was found in the Linux Kernel, version 3.13 through 5.4, in the way
    the Linux kernel's KVM hypervisor handled the 'KVM_GET_EMULATED_CPUID' ioctl(2) request to get CPUID
    features emulated by the KVM hypervisor. A user or process able to access the '/dev/kvm' device could use
    this flaw to crash the system, resulting in a denial of service. (CVE-2019-19332)

  - The Linux kernel before 5.4.2 mishandles ext4_expand_extra_isize, as demonstrated by use-after-free errors
    in __ext4_expand_extra_isize and ext4_xattr_set_entry, related to fs/ext4/inode.c and fs/ext4/super.c, aka
    CID-4ea99936a163. (CVE-2019-19767)

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-4258-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/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: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-2019-18683");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2019-19252");

  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:"2019/08/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/01/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/01/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1010-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1024-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1029-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1029-gke");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  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) 2020-2024 Canonical, Inc. / NASL script (C) 2020-2024 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 (! ('18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 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 = {
  '18.04': {
    '5.0.0': {
      'oracle': '5.0.0-1010',
      'aws': '5.0.0-1024',
      'gcp': '5.0.0-1029',
      'gke': '5.0.0-1029'
    }
  }
};

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-4258-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2019-15099', 'CVE-2019-15291', 'CVE-2019-18683', 'CVE-2019-18885', 'CVE-2019-19050', 'CVE-2019-19062', 'CVE-2019-19071', 'CVE-2019-19077', 'CVE-2019-19078', 'CVE-2019-19079', 'CVE-2019-19082', 'CVE-2019-19227', 'CVE-2019-19252', 'CVE-2019-19332', 'CVE-2019-19767');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-4258-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}