Ubuntu 16.04 LTS : Linux kernel (Raspberry Pi 2, Snapdragon) vulnerabilities (USN-3656-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3656-1. 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(110051);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");

  script_cve_id(
    "CVE-2017-17975",
    "CVE-2017-18193",
    "CVE-2017-18222",
    "CVE-2018-1065",
    "CVE-2018-1068",
    "CVE-2018-1130",
    "CVE-2018-5803",
    "CVE-2018-7480",
    "CVE-2018-7757",
    "CVE-2018-7995",
    "CVE-2018-8781",
    "CVE-2018-8822"
  );
  script_xref(name:"USN", value:"3656-1");

  script_name(english:"Ubuntu 16.04 LTS : Linux kernel (Raspberry Pi 2, Snapdragon) vulnerabilities (USN-3656-1)");

  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 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-3656-1 advisory.

  - Use-after-free in the usbtv_probe function in drivers/media/usb/usbtv/usbtv-core.c in the Linux kernel
    through 4.14.10 allows attackers to cause a denial of service (system crash) or possibly have unspecified
    other impact by triggering failure of audio registration, because a kfree of the usbtv data structure
    occurs during a usbtv_video_free call, but the usbtv_video_fail label's code attempts to both access and
    free this data structure. (CVE-2017-17975)

  - fs/f2fs/extent_cache.c in the Linux kernel before 4.13 mishandles extent trees, which allows local users
    to cause a denial of service (BUG) via an application with multiple threads. (CVE-2017-18193)

  - In the Linux kernel before 4.12, Hisilicon Network Subsystem (HNS) does not consider the ETH_SS_PRIV_FLAGS
    case when retrieving sset_count data, which allows local users to cause a denial of service (buffer
    overflow and memory corruption) or possibly have unspecified other impact, as demonstrated by
    incompatibility between hns_get_sset_count and ethtool_get_strings. (CVE-2017-18222)

  - The netfilter subsystem in the Linux kernel through 4.15.7 mishandles the case of a rule blob that
    contains a jump but lacks a user-defined chain, which allows local users to cause a denial of service
    (NULL pointer dereference) by leveraging the CAP_NET_RAW or CAP_NET_ADMIN capability, related to
    arpt_do_table in net/ipv4/netfilter/arp_tables.c, ipt_do_table in net/ipv4/netfilter/ip_tables.c, and
    ip6t_do_table in net/ipv6/netfilter/ip6_tables.c. (CVE-2018-1065)

  - A flaw was found in the Linux 4.x kernel's implementation of 32-bit syscall interface for bridging. This
    allowed a privileged user to arbitrarily write to a limited range of kernel memory. (CVE-2018-1068)

  - Linux kernel before version 4.16-rc7 is vulnerable to a null pointer dereference in dccp_write_xmit()
    function in net/dccp/output.c in that allows a local user to cause a denial of service by a number of
    certain crafted system calls. (CVE-2018-1130)

  - In the Linux Kernel before version 4.15.8, 4.14.25, 4.9.87, 4.4.121, 4.1.51, and 3.2.102, an error in the
    _sctp_make_chunk() function (net/sctp/sm_make_chunk.c) when handling SCTP packets length can be
    exploited to cause a kernel crash. (CVE-2018-5803)

  - The blkcg_init_queue function in block/blk-cgroup.c in the Linux kernel before 4.11 allows local users to
    cause a denial of service (double free) or possibly have unspecified other impact by triggering a creation
    failure. (CVE-2018-7480)

  - Memory leak in the sas_smp_get_phy_events function in drivers/scsi/libsas/sas_expander.c in the Linux
    kernel through 4.15.7 allows local users to cause a denial of service (memory consumption) via many read
    accesses to files in the /sys/class/sas_phy directory, as demonstrated by the
    /sys/class/sas_phy/phy-1:0:12/invalid_dword_count file. (CVE-2018-7757)

  - Race condition in the store_int_with_restart() function in arch/x86/kernel/cpu/mcheck/mce.c in the Linux
    kernel through 4.15.7 allows local users to cause a denial of service (panic) by leveraging root access to
    write to the check_interval file in a /sys/devices/system/machinecheck/machinecheck<cpu number> directory.
    NOTE: a third party has indicated that this report is not security relevant (CVE-2018-7995)

  - The udl_fb_mmap function in drivers/gpu/drm/udl/udl_fb.c at the Linux kernel version 3.4 and up to and
    including 4.15 has an integer-overflow vulnerability allowing local users with access to the udldrmfb
    driver to obtain full read and write permissions on kernel physical pages, resulting in a code execution
    in kernel space. (CVE-2018-8781)

  - Incorrect buffer length handling in the ncp_read_kernel function in fs/ncpfs/ncplib_kernel.c in the Linux
    kernel through 4.15.11, and in drivers/staging/ncpfs/ncplib_kernel.c in the Linux kernel 4.16-rc through
    4.16-rc6, could be exploited by malicious NCPFS servers to crash the kernel or execute code.
    (CVE-2018-8822)

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-3656-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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:L/AC:L/PR:L/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-2018-8822");

  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:"2017/12/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/05/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/05/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1090-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1093-snapdragon");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-: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) 2018-2024 Canonical, Inc. / NASL script (C) 2018-2024 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)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04', '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': {
    '4.4.0': {
      'raspi2': '4.4.0-1090',
      'snapdragon': '4.4.0-1093'
    }
  }
};

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-3656-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2017-17975', 'CVE-2017-18193', 'CVE-2017-18222', 'CVE-2018-1065', 'CVE-2018-1068', 'CVE-2018-1130', 'CVE-2018-5803', 'CVE-2018-7480', 'CVE-2018-7757', 'CVE-2018-7995', 'CVE-2018-8781', 'CVE-2018-8822');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-3656-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}