Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3620-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3620-1. 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(108843);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");

  script_cve_id(
    "CVE-2017-11089",
    "CVE-2017-12762",
    "CVE-2017-17448",
    "CVE-2017-17741",
    "CVE-2017-17805",
    "CVE-2017-17807",
    "CVE-2018-1000026",
    "CVE-2018-5332"
  );
  script_xref(name:"USN", value:"3620-1");

  script_name(english:"Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3620-1)");

  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 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-3620-1 advisory.

  - In android for MSM, Firefox OS for MSM, QRD Android, with all Android releases from CAF using the Linux
    kernel, a buffer overread is observed in nl80211_set_station when user space application sends attribute
    NL80211_ATTR_LOCAL_MESH_POWER_MODE with data of size less than 4 bytes (CVE-2017-11089)

  - In /drivers/isdn/i4l/isdn_net.c: A user-controlled buffer is copied into a local buffer of constant size
    using strcpy without a length check which can cause a buffer overflow. This affects the Linux kernel
    4.9-stable tree, 4.12-stable tree, 3.18-stable tree, and 4.4-stable tree. (CVE-2017-12762)

  - net/netfilter/nfnetlink_cthelper.c in the Linux kernel through 4.14.4 does not require the CAP_NET_ADMIN
    capability for new, get, and del operations, which allows local users to bypass intended access
    restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces.
    (CVE-2017-17448)

  - The KVM implementation in the Linux kernel through 4.14.7 allows attackers to obtain potentially sensitive
    information from kernel memory, aka a write_mmio stack-based out-of-bounds read, related to
    arch/x86/kvm/x86.c and include/trace/events/kvm.h. (CVE-2017-17741)

  - The Salsa20 encryption algorithm in the Linux kernel before 4.14.8 does not correctly handle zero-length
    inputs, allowing a local attacker able to use the AF_ALG-based skcipher interface
    (CONFIG_CRYPTO_USER_API_SKCIPHER) to cause a denial of service (uninitialized-memory free and kernel
    crash) or have unspecified other impact by executing a crafted sequence of system calls that use the
    blkcipher_walk API. Both the generic implementation (crypto/salsa20_generic.c) and x86 implementation
    (arch/x86/crypto/salsa20_glue.c) of Salsa20 were vulnerable. (CVE-2017-17805)

  - The KEYS subsystem in the Linux kernel before 4.14.6 omitted an access-control check when adding a key to
    the current task's default request-key keyring via the request_key() system call, allowing a local user
    to use a sequence of crafted system calls to add keys to a keyring with only Search permission (not Write
    permission) to that keyring, related to construct_get_dest_keyring() in security/keys/request_key.c.
    (CVE-2017-17807)

  - Linux Linux kernel version at least v4.8 onwards, probably well before contains a Insufficient input
    validation vulnerability in bnx2x network card driver that can result in DoS: Network card firmware
    assertion takes card off-line. This attack appear to be exploitable via An attacker on a must pass a very
    large, specially crafted packet to the bnx2x card. This can be done from an untrusted guest VM..
    (CVE-2018-1000026)

  - In the Linux kernel through 3.2, the rds_message_alloc_sgs() function does not validate a value that is
    used during DMA page allocation, leading to a heap-based out-of-bounds write (related to the
    rds_rdma_extra_size function in net/rds/rdma.c). (CVE-2018-5332)

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-3620-1");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-12762");

  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:"2017/08/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/04/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/04/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-144-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-144-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-144-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-144-powerpc-e500");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-144-powerpc-e500mc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-144-powerpc-smp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-144-powerpc64-emb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-144-powerpc64-smp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-: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 (! ('14.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04', '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 = {
  '14.04': {
    '3.13.0': {
      'generic': '3.13.0-144',
      'generic-lpae': '3.13.0-144',
      'lowlatency': '3.13.0-144',
      'powerpc-e500': '3.13.0-144',
      'powerpc-e500mc': '3.13.0-144',
      'powerpc-smp': '3.13.0-144',
      'powerpc64-emb': '3.13.0-144',
      'powerpc64-smp': '3.13.0-144'
    }
  }
};

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-3620-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2017-11089', 'CVE-2017-12762', 'CVE-2017-17448', 'CVE-2017-17741', 'CVE-2017-17805', 'CVE-2017-17807', 'CVE-2018-5332', 'CVE-2018-1000026');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-3620-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}