Ubuntu 14.04 LTS : Linux kernel (Xenial HWE) vulnerabilities (USN-3312-2)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3312-2. 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(100665);
  script_version("3.13");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");

  script_cve_id(
    "CVE-2016-7913",
    "CVE-2016-7917",
    "CVE-2016-8632",
    "CVE-2016-9083",
    "CVE-2016-9084",
    "CVE-2016-9604",
    "CVE-2017-2596",
    "CVE-2017-2671",
    "CVE-2017-6001",
    "CVE-2017-7472",
    "CVE-2017-7618",
    "CVE-2017-7645",
    "CVE-2017-7889",
    "CVE-2017-7895"
  );
  script_xref(name:"USN", value:"3312-2");

  script_name(english:"Ubuntu 14.04 LTS : Linux kernel (Xenial HWE) vulnerabilities (USN-3312-2)");

  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 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-3312-2 advisory.

  - The xc2028_set_config function in drivers/media/tuners/tuner-xc2028.c in the Linux kernel before 4.6
    allows local users to gain privileges or cause a denial of service (use-after-free) via vectors involving
    omission of the firmware name from a certain data structure. (CVE-2016-7913)

  - The nfnetlink_rcv_batch function in net/netfilter/nfnetlink.c in the Linux kernel before 4.5 does not
    check whether a batch message's length field is large enough, which allows local users to obtain sensitive
    information from kernel memory or cause a denial of service (infinite loop or out-of-bounds read) by
    leveraging the CAP_NET_ADMIN capability. (CVE-2016-7917)

  - The tipc_msg_build function in net/tipc/msg.c in the Linux kernel through 4.8.11 does not validate the
    relationship between the minimum fragment length and the maximum packet size, which allows local users to
    gain privileges or cause a denial of service (heap-based buffer overflow) by leveraging the CAP_NET_ADMIN
    capability. (CVE-2016-8632)

  - drivers/vfio/pci/vfio_pci.c in the Linux kernel through 4.8.11 allows local users to bypass integer
    overflow checks, and cause a denial of service (memory corruption) or have unspecified other impact, by
    leveraging access to a vfio PCI device file for a VFIO_DEVICE_SET_IRQS ioctl call, aka a state machine
    confusion bug. (CVE-2016-9083)

  - drivers/vfio/pci/vfio_pci_intrs.c in the Linux kernel through 4.8.11 misuses the kzalloc function, which
    allows local users to cause a denial of service (integer overflow) or have unspecified other impact by
    leveraging access to a vfio PCI device file. (CVE-2016-9084)

  - It was discovered in the Linux kernel before 4.11-rc8 that root can gain direct access to an internal
    keyring, such as '.dns_resolver' in RHEL-7 or '.builtin_trusted_keys' upstream, by joining it as its
    session keyring. This allows root to bypass module signature verification by adding a new public key of
    its own devising to the keyring. (CVE-2016-9604)

  - The nested_vmx_check_vmptr function in arch/x86/kvm/vmx.c in the Linux kernel through 4.9.8 improperly
    emulates the VMXON instruction, which allows KVM L1 guest OS users to cause a denial of service (host OS
    memory consumption) by leveraging the mishandling of page references. (CVE-2017-2596)

  - The ping_unhash function in net/ipv4/ping.c in the Linux kernel through 4.10.8 is too late in obtaining a
    certain lock and consequently cannot ensure that disconnect function calls are safe, which allows local
    users to cause a denial of service (panic) by leveraging access to the protocol value of IPPROTO_ICMP in a
    socket system call. (CVE-2017-2671)

  - Race condition in kernel/events/core.c in the Linux kernel before 4.9.7 allows local users to gain
    privileges via a crafted application that makes concurrent perf_event_open system calls for moving a
    software group into a hardware context. NOTE: this vulnerability exists because of an incomplete fix for
    CVE-2016-6786. (CVE-2017-6001)

  - The KEYS subsystem in the Linux kernel before 4.10.13 allows local users to cause a denial of service
    (memory consumption) via a series of KEY_REQKEY_DEFL_THREAD_KEYRING keyctl_set_reqkey_keyring calls.
    (CVE-2017-7472)

  - crypto/ahash.c in the Linux kernel through 4.10.9 allows attackers to cause a denial of service (API
    operation calling its own callback, and infinite recursion) by triggering EBUSY on a full queue.
    (CVE-2017-7618)

  - The NFSv2/NFSv3 server in the nfsd subsystem in the Linux kernel through 4.10.11 allows remote attackers
    to cause a denial of service (system crash) via a long RPC reply, related to net/sunrpc/svc.c,
    fs/nfsd/nfs3xdr.c, and fs/nfsd/nfsxdr.c. (CVE-2017-7645)

  - The mm subsystem in the Linux kernel through 3.2 does not properly enforce the CONFIG_STRICT_DEVMEM
    protection mechanism, which allows local users to read or write to kernel memory locations in the first
    megabyte (and bypass slab-allocation access restrictions) via an application that opens the /dev/mem file,
    related to arch/x86/mm/init.c and drivers/char/mem.c. (CVE-2017-7889)

  - The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lack certain checks for the
    end of a buffer, which allows remote attackers to trigger pointer-arithmetic errors or possibly have
    unspecified other impact via crafted requests, related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c.
    (CVE-2017-7895)

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-3312-2");
  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: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-2017-7895");

  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:"2016/11/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/06/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-79-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-79-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-79-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-79-powerpc-e500mc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-79-powerpc-smp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-79-powerpc64-emb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-79-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) 2017-2024 Canonical, Inc. / NASL script (C) 2017-2024 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': {
    '4.4.0': {
      'generic': '4.4.0-79',
      'generic-lpae': '4.4.0-79',
      'lowlatency': '4.4.0-79',
      'powerpc-e500mc': '4.4.0-79',
      'powerpc-smp': '4.4.0-79',
      'powerpc64-emb': '4.4.0-79',
      'powerpc64-smp': '4.4.0-79'
    }
  }
};

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-3312-2');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2016-7913', 'CVE-2016-7917', 'CVE-2016-8632', 'CVE-2016-9083', 'CVE-2016-9084', 'CVE-2016-9604', 'CVE-2017-2596', 'CVE-2017-2671', 'CVE-2017-6001', 'CVE-2017-7472', 'CVE-2017-7618', 'CVE-2017-7645', 'CVE-2017-7889', 'CVE-2017-7895');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-3312-2');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}