RHEL 7 : kernel-rt (RHSA-2016:1541)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2016:1541. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(92695);
  script_version("2.13");
  script_cvs_date("Date: 2019/10/24 15:35:41");

  script_cve_id("CVE-2015-8660", "CVE-2016-4470");
  script_xref(name:"RHSA", value:"2016:1541");

  script_name(english:"RHEL 7 : kernel-rt (RHSA-2016:1541)");
  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-rt is now available for Red Hat Enterprise Linux
7.

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-rt packages provide the Real Time Linux Kernel, which
enables fine-tuning for systems with extremely high determinism
requirements.

* A flaw was found in the Linux kernel's keyring handling code, where
in key_reject_and_link() an uninitialised variable would eventually
lead to arbitrary free address which could allow attacker to use a
use-after-free style attack. (CVE-2016-4470, Important)

* The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel
through 4.3.3 attempts to merge distinct setattr operations, which
allows local users to bypass intended access restrictions and modify
the attributes of arbitrary overlay files via a crafted application.
(CVE-2015-8660, Moderate)

Red Hat would like to thank Nathan Williams for reporting
CVE-2015-8660. The CVE-2016-4470 issue was discovered by David Howells
(Red Hat Inc.).

The kernel-rt packages have been upgraded to the
kernel-3.10.0-327.28.2.el7 source tree, which provides a number of bug
fixes over the previous version. (BZ#1350307)

This update also fixes the following bugs :

* Previously, use of the get/put_cpu_var() function in function
refill_stock () from the memcontrol cgroup code lead to a 'scheduling
while atomic' warning. With this update, refill_stock() uses the
get/put_cpu_light() function instead, and the warnings no longer
appear. (BZ#1347171)

* Prior to this update, if a real time task pinned to a given CPU was
taking 100% of the CPU time, then calls to the lru_add_drain_all()
function on other CPUs blocked for an undetermined amount of time.
This caused latencies and undesired side effects. With this update,
lru_add_drain_all() has been changed to drain the LRU pagevecs of
remote CPUs. (BZ#1348523)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2016:1541"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2015-8660"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-4470"
  );
  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:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Overlayfs Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'CANVAS');

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debuginfo-common-x86_64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-kvm-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/12/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/08/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/08/03");
  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:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 7.x", "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-2015-8660", "CVE-2016-4470");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2016:1541");
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2016:1541";
  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:"RHEL7", cpu:"x86_64", reference:"kernel-rt-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-debuginfo-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-devel-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-kvm-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-kvm-debuginfo-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debuginfo-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debuginfo-common-x86_64-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-devel-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", reference:"kernel-rt-doc-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-kvm-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-kvm-debuginfo-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-debuginfo-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-devel-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-kvm-3.10.0-327.28.2.rt56.234.el7_2")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-kvm-debuginfo-3.10.0-327.28.2.rt56.234.el7_2")) 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-rt / kernel-rt-debug / kernel-rt-debug-debuginfo / etc");
  }
}