Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3422-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3422-1. 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(103326);
  script_version("3.13");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");

  script_cve_id(
    "CVE-2016-10044",
    "CVE-2016-10200",
    "CVE-2016-7097",
    "CVE-2016-8650",
    "CVE-2016-9083",
    "CVE-2016-9084",
    "CVE-2016-9178",
    "CVE-2016-9191",
    "CVE-2016-9604",
    "CVE-2016-9754",
    "CVE-2017-1000251",
    "CVE-2017-5970",
    "CVE-2017-6214",
    "CVE-2017-6346",
    "CVE-2017-6951",
    "CVE-2017-7187",
    "CVE-2017-7472",
    "CVE-2017-7541"
  );
  script_xref(name:"USN", value:"3422-1");

  script_name(english:"Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3422-1)");

  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-3422-1 advisory.

  - The aio_mount function in fs/aio.c in the Linux kernel before 4.7.7 does not properly restrict execute
    access, which makes it easier for local users to bypass intended SELinux W^X policy restrictions, and
    consequently gain privileges, via an io_setup system call. (CVE-2016-10044)

  - Race condition in the L2TPv3 IP Encapsulation feature in the Linux kernel before 4.8.14 allows local users
    to gain privileges or cause a denial of service (use-after-free) by making multiple bind system calls
    without properly ascertaining whether a socket has the SOCK_ZAPPED status, related to net/l2tp/l2tp_ip.c
    and net/l2tp/l2tp_ip6.c. (CVE-2016-10200)

  - The filesystem implementation in the Linux kernel through 4.8.2 preserves the setgid bit during a setxattr
    call, which allows local users to gain group privileges by leveraging the existence of a setgid program
    with restrictions on execute permissions. (CVE-2016-7097)

  - The mpi_powm function in lib/mpi/mpi-pow.c in the Linux kernel through 4.8.11 does not ensure that memory
    is allocated for limb data, which allows local users to cause a denial of service (stack memory corruption
    and panic) via an add_key system call for an RSA key with a zero exponent. (CVE-2016-8650)

  - 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)

  - The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel before 4.7.5 does not
    initialize a certain integer variable, which allows local users to obtain sensitive information from
    kernel stack memory by triggering failure of a get_user_ex call. (CVE-2016-9178)

  - The cgroup offline implementation in the Linux kernel through 4.8.11 mishandles certain drain operations,
    which allows local users to cause a denial of service (system hang) by leveraging access to a container
    environment for executing a crafted application, as demonstrated by trinity. (CVE-2016-9191)

  - 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 ring_buffer_resize function in kernel/trace/ring_buffer.c in the profiling subsystem in the Linux
    kernel before 4.6.1 mishandles certain integer calculations, which allows local users to gain privileges
    by writing to the /sys/kernel/debug/tracing/buffer_size_kb file. (CVE-2016-9754)

  - The native Bluetooth stack in the Linux Kernel (BlueZ), starting at the Linux kernel version 2.6.32 and up
    to and including 4.13.1, are vulnerable to a stack overflow vulnerability in the processing of L2CAP
    configuration responses resulting in Remote code execution in kernel space. (CVE-2017-1000251)

  - The ipv4_pktinfo_prepare function in net/ipv4/ip_sockglue.c in the Linux kernel through 4.9.9 allows
    attackers to cause a denial of service (system crash) via (1) an application that makes crafted system
    calls or possibly (2) IPv4 traffic with invalid IP options. (CVE-2017-5970)

  - The tcp_splice_read function in net/ipv4/tcp.c in the Linux kernel before 4.9.11 allows remote attackers
    to cause a denial of service (infinite loop and soft lockup) via vectors involving a TCP packet with the
    URG flag. (CVE-2017-6214)

  - Race condition in net/packet/af_packet.c in the Linux kernel before 4.9.13 allows local users to cause a
    denial of service (use-after-free) or possibly have unspecified other impact via a multithreaded
    application that makes PACKET_FANOUT setsockopt system calls. (CVE-2017-6346)

  - The keyring_search_aux function in security/keys/keyring.c in the Linux kernel through 3.14.79 allows
    local users to cause a denial of service (NULL pointer dereference and OOPS) via a request_key system call
    for the dead type. (CVE-2017-6951)

  - The sg_ioctl function in drivers/scsi/sg.c in the Linux kernel through 4.10.4 allows local users to cause
    a denial of service (stack-based buffer overflow) or possibly have unspecified other impact via a large
    command size in an SG_NEXT_CMD_LEN ioctl call, leading to out-of-bounds write access in the sg_write
    function. (CVE-2017-7187)

  - 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)

  - The brcmf_cfg80211_mgmt_tx function in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c in the
    Linux kernel before 4.12.3 allows local users to cause a denial of service (buffer overflow and system
    crash) or possibly gain privileges via a crafted NL80211_CMD_FRAME Netlink packet. (CVE-2017-7541)

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-3422-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:S/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:A/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-2017-1000251");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/10/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/09/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-132-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-132-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-132-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-132-powerpc-e500");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-132-powerpc-e500mc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-132-powerpc-smp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-132-powerpc64-emb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-132-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': {
    '3.13.0': {
      'generic': '3.13.0-132',
      'generic-lpae': '3.13.0-132',
      'lowlatency': '3.13.0-132',
      'powerpc-e500': '3.13.0-132',
      'powerpc-e500mc': '3.13.0-132',
      'powerpc-smp': '3.13.0-132',
      'powerpc64-emb': '3.13.0-132',
      'powerpc64-smp': '3.13.0-132'
    }
  }
};

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-3422-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2016-7097', 'CVE-2016-8650', 'CVE-2016-9083', 'CVE-2016-9084', 'CVE-2016-9178', 'CVE-2016-9191', 'CVE-2016-9604', 'CVE-2016-9754', 'CVE-2016-10044', 'CVE-2016-10200', 'CVE-2017-5970', 'CVE-2017-6214', 'CVE-2017-6346', 'CVE-2017-6951', 'CVE-2017-7187', 'CVE-2017-7472', 'CVE-2017-7541', 'CVE-2017-1000251');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-3422-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}