RHEL 6 : kernel (RHSA-2017:0307)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2017:0307. The text 
# itself is copyright (C) Red Hat, Inc.
#

include('compat.inc');

if (description)
{
  script_id(97373);
  script_version("3.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/04/15");

  script_cve_id("CVE-2016-6136", "CVE-2016-9555");
  script_xref(name:"RHSA", value:"2017:0307");

  script_name(english:"RHEL 6 : kernel (RHSA-2017:0307)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for kernel.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2017:0307 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * When creating audit records for parameters to executed children processes, an attacker can convince the
    Linux kernel audit subsystem can create corrupt records which may allow an attacker to misrepresent or
    evade logging of executing commands. (CVE-2016-6136, Moderate)

    * A flaw was found in the Linux kernel's implementation of the SCTP protocol. A remote attacker could
    trigger an out-of-bounds read with an offset of up to 64kB potentially causing the system to crash.
    (CVE-2016-9555, Moderate)

    Bug Fix(es):

    * The qlnic driver previously attempted to fetch pending transmission descriptors before all writes were
    complete, which lead to firmware hangs. With this update, the qlcnic driver has been fixed to complete all
    writes before the hardware fetches any pending transmission descriptors. As a result, the firmware no
    longer hangs with the qlcnic driver. (BZ#1403143)

    * Previously, when a NFS share was mounted, the file-system (FS) cache was incorrectly enabled even when
    the -o fsc option was not used in the mount command. Consequently, the cachefilesd service stored files
    in the NFS share even when not instructed to by the user. With this update, NFS does not use the FS cache
    if not instructed by the -o fsc option. As a result, NFS no longer enables caching if the -o fsc
    option is not used. (BZ#1399172)

    * Previously, an NFS client and NFS server got into a NFS4 protocol loop involving a WRITE action and a
    NFS4ERR_EXPIRED response when the current_fileid counter got to the wraparound point by overflowing the
    value of 32 bits. This update fixes the NFS server to handle the current_fileid wraparound. As a result,
    the described NFS4 protocol loop no longer occurs. (BZ#1399174)

    * Previously, certain configurations of the Hewlett Packard Smart Array (HPSA) devices caused hardware to
    be set offline incorrectly when the HPSA driver was expected to wait for existing I/O operations to
    complete. Consequently, a kernel panic occurred. This update prevents the described problem. As a result,
    the kernel panic no longer occurs. (BZ#1399175)

    * Previously, memory corruption by copying data into the wrong memory locations sometimes occurred,
    because the __copy_tofrom_user() function was returning incorrect values. This update fixes the
    __copy_tofrom_user() function so that it no longer returns larger values than the number of bytes it was
    asked to copy. As a result, memory corruption no longer occurs in he described scenario. (BZ#1398185)

    * Previously, guest virtual machines (VMs) on a Hyper-V server cluster got in some cases rebooted during
    the graceful node failover test, because the host kept sending heartbeat packets independently of guests
    responding to them. This update fixes the bug by properly responding to all the heartbeat messages in the
    queue, even if they are pending. As a result, guest VMs no longer get rebooted under the described
    circumstances. (BZ#1397739)

    * When the punching hole feature of the fallocate utility was used on an ext4 file system inode with
    extent depth of 1, the extent tree of the inode sometimes became corrupted. With this update, the
    underlying source code has been fixed, and extent tree corruption no longer occurs in the described
    situation. (BZ#1397808)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2017/rhsa-2017_0307.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?875de9b1");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1353533");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1397930");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2017:0307");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#moderate");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/vulnerabilities/2706661");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL kernel package based on the guidance in RHSA-2017:0307.");
  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-2016-9555");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(125, 362);
  script_set_attribute(attribute:"vendor_severity", value:"Moderate");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/08/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/02/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/02/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-bootwrapper");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-firmware");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-kdump");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-kdump-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python-perf");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2017-2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "linux_alt_patch_detect.nasl", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm.inc');
include('rhel.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/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '6')) audit(AUDIT_OS_NOT, 'Red Hat 6.x', 'Red Hat ' + os_ver);

if (!get_kb_item('Host/RedHat/rpm-list')) 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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  rm_kb_item(name:'Host/uptrack-uname-r');
  var cve_list = make_list('CVE-2016-6136', 'CVE-2016-9555');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for RHSA-2017:0307');
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

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      'content/dist/rhel/client/6/6Client/i386/os',
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      {'reference':'kernel-debug-2.6.32-642.15.1.el6', 'cpu':'i686', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
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      {'reference':'kernel-debug-devel-2.6.32-642.15.1.el6', 'cpu':'s390x', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-devel-2.6.32-642.15.1.el6', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-devel-2.6.32-642.15.1.el6', 'cpu':'i686', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-devel-2.6.32-642.15.1.el6', 'cpu':'ppc64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-devel-2.6.32-642.15.1.el6', 'cpu':'s390x', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-devel-2.6.32-642.15.1.el6', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-firmware-2.6.32-642.15.1.el6', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-headers-2.6.32-642.15.1.el6', 'cpu':'i686', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-headers-2.6.32-642.15.1.el6', 'cpu':'ppc64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-headers-2.6.32-642.15.1.el6', 'cpu':'s390x', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-headers-2.6.32-642.15.1.el6', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-kdump-2.6.32-642.15.1.el6', 'cpu':'s390x', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-kdump-devel-2.6.32-642.15.1.el6', 'cpu':'s390x', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perf-2.6.32-642.15.1.el6', 'cpu':'i686', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perf-2.6.32-642.15.1.el6', 'cpu':'ppc64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perf-2.6.32-642.15.1.el6', 'cpu':'s390x', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perf-2.6.32-642.15.1.el6', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python-perf-2.6.32-642.15.1.el6', 'cpu':'i686', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python-perf-2.6.32-642.15.1.el6', 'cpu':'ppc64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python-perf-2.6.32-642.15.1.el6', 'cpu':'s390x', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python-perf-2.6.32-642.15.1.el6', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var flag = 0;
foreach var constraint_array ( constraints ) {
  var repo_relative_urls = NULL;
  if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
  foreach var pkg ( constraint_array['pkgs'] ) {
    var reference = NULL;
    var _release = NULL;
    var sp = NULL;
    var _cpu = NULL;
    var el_string = NULL;
    var rpm_spec_vers_cmp = NULL;
    var epoch = NULL;
    var allowmaj = NULL;
    var exists_check = NULL;
    var cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        _release &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || rpm_exists(release:_release, rpm:exists_check))) &&
        rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'kernel / kernel-bootwrapper / kernel-debug / kernel-debug-devel / etc');
}