RHEL 7 : kernel-rt (RHSA-2017:3322)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2017:3322. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(104950);
  script_version("3.10");
  script_cvs_date("Date: 2019/10/24 15:35:44");

  script_cve_id("CVE-2017-1000380");
  script_xref(name:"RHSA", value:"2017:3322");

  script_name(english:"RHEL 7 : kernel-rt (RHSA-2017:3322)");
  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 Moderate. 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.

Security Fix(es) :

* It was found that the timer functionality in the Linux kernel ALSA
subsystem is prone to a race condition between read and ioctl system
call handlers, resulting in an uninitialized memory disclosure to user
space. A local user could use this flaw to read information belonging
to other users. (CVE-2017-1000380, Moderate)

Red Hat would like to thank Alexander Potapenko (Google) for reporting
this issue.

Bug Fix(es) :

* The kernel-rt packages have been upgraded to the 3.10.0-693.11.1
source tree, which provides a number of bug fixes over the previous
version. (BZ# 1500035)

* Previously, the hfi1 driver called the preempt_disable() function to
prevent migration on standard Red Hat Enterprise Linux and on Red Hat
Enterprise Linux for Real Time. On Red Hat Enterprise Linux for Real
Time with the realtime kernel (kernel-rt), calling preempt_disable()
triggered a kernel panic. With this update, the kernel-rt code has
been modified to use a realtime-specific function call to the
preempt_disable_nort() function, which expands to the correct calls
based on the kernel that is running. As a result, the hfi1 driver now
works correctly on both Red Hat Enterprise Linux kernel and Red Hat
Enterprise Linux for Real Time kernel-rt. (BZ# 1507053)

* Previously, the hfi1 driver called the preempt_disable() function to
prevent migration on standard Red Hat Enterprise Linux and on Red Hat
Enterprise Linux for Real Time. On Red Hat Enterprise Linux for Real
Time with the realtime kernel (kernel-rt), calling preempt_disable()
triggered a kernel panic. With this update, the kernel-rt code has
been modified to use a realtime-specific function call to the
preempt_disable_nort() function, which expands to the correct calls
based on the kernel that is running. As a result, the hfi1 driver now
works correctly on both Red Hat Enterprise Linux kernel and Red Hat
Enterprise Linux for Real Time kernel-rt. (BZ# 1507054)

* In the realtime kernel, if the rt_mutex locking mechanism was taken
in the interrupt context, the normal priority inheritance protocol
incorrectly identified a deadlock, and a kernel panic occurred. This
update reverts the patch that added rt_mutex in the interrupt context,
and the kernel no longer panics due to this behavior. (BZ#1511382)

Enhancement(s) :

* The current realtime throttling mechanism prevents the starvation of
non-realtime tasks by CPU-intensive realtime tasks. When a realtime
run queue is throttled, it allows non-realtime tasks to run. If there
are not non-realtime tasks, the CPU goes idle. To safely maximize CPU
usage by decreasing the CPU idle time, the RT_RUNTIME_GREED scheduler
feature has been implemented. When enabled, this feature checks if
non-realtime tasks are starving before throttling the realtime task.
The RT_RUNTIME_GREED scheduler option guarantees some run time on all
CPUs for the non-realtime tasks, while keeping the realtime tasks
running as much as possible. (BZ# 1505158)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2017:3322"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-1000380"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
  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:N/A:N");
  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-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:"2017/06/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/11/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/01");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2019 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-2017-1000380");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2017:3322");
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2017:3322";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      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-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-debuginfo-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-devel-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-kvm-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-kvm-debuginfo-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debuginfo-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debuginfo-common-x86_64-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-devel-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", reference:"kernel-rt-doc-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-kvm-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-kvm-debuginfo-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-debuginfo-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-devel-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-kvm-3.10.0-693.11.1.rt56.632.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-kvm-debuginfo-3.10.0-693.11.1.rt56.632.el7")) flag++;

  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      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");
  }
}