RHEL 6 : kernel (RHSA-2016:1640)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2016:1640. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(93070);
  script_version("2.12");
  script_cvs_date("Date: 2019/10/24 15:35:41");

  script_cve_id("CVE-2016-4565");
  script_xref(name:"RHSA", value:"2016:1640");

  script_name(english:"RHEL 6 : kernel (RHSA-2016:1640)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An update for kernel is now available for Red Hat Enterprise Linux 6.6
Extended Update Support.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

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

Security Fix(es) :

* A flaw was found in the way certain interfaces of the Linux kernel's
Infiniband subsystem used write() as bi-directional ioctl()
replacement, which could lead to insufficient memory security checks
when being invoked using the splice() system call. A local
unprivileged user on a system with either Infiniband hardware present
or RDMA Userspace Connection Manager Access module explicitly loaded,
could use this flaw to escalate their privileges on the system.
(CVE-2016-4565, Important)

Red Hat would like to thank Jann Horn for reporting this issue.

Bug Fix(es) :

* After upgrading the kernel, the CPU load average was higher compared
to the prior kernel version due to the modification of the scheduler.
The provided patchset rolls back the calculation algorithm of the load
average to the status of the previous system version, thus resulting
in lower values in the same system load. (BZ#1343013)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2016:1640"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-4565"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  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:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  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-abi-whitelists");
  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-debuginfo");
  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-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-i686");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-s390x");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-x86_64");
  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-doc");
  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-debuginfo");
  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:perf-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python-perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python-perf-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6.6");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/05/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/08/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/08/22");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Red Hat Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");
include("ksplice.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^6\.6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 6.6", "Red Hat " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< 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");
  cve_list = make_list("CVE-2016-4565");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2016:1640");
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2016:1640";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"kernel-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"kernel-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", reference:"kernel-abi-whitelists-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"kernel-debug-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-debug-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"kernel-debug-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"kernel-debug-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-debug-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"kernel-debug-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"kernel-debug-devel-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-debug-devel-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"kernel-debug-devel-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"kernel-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"kernel-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"kernel-debuginfo-common-i686-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-debuginfo-common-s390x-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"kernel-debuginfo-common-x86_64-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"kernel-devel-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-devel-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"kernel-devel-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", reference:"kernel-doc-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", reference:"kernel-firmware-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"kernel-headers-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-headers-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"kernel-headers-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-kdump-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-kdump-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"kernel-kdump-devel-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"perf-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"perf-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"perf-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"perf-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"perf-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"perf-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"python-perf-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"python-perf-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"python-perf-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"i686", reference:"python-perf-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"s390x", reference:"python-perf-debuginfo-2.6.32-504.51.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", sp:"6", cpu:"x86_64", reference:"python-perf-debuginfo-2.6.32-504.51.1.el6")) flag++;

  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "kernel / kernel-abi-whitelists / kernel-debug / etc");
  }
}