RHEL 6 : MRG (RHSA-2017:0113)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2017:0113. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(96595);
  script_version("3.11");
  script_cvs_date("Date: 2019/10/24 15:35:42");

  script_cve_id("CVE-2016-6828", "CVE-2016-7117", "CVE-2016-9555", "CVE-2017-13167");
  script_xref(name:"RHSA", value:"2017:0113");

  script_name(english:"RHEL 6 : MRG (RHSA-2017:0113)");
  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 MRG
2.5.

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.

The kernel-rt packages have been upgraded to version 3.10.0-514, which
provides a number of security and bug fixes over the previous version.
(BZ#1400193)

Security Fix(es) :

* A use-after-free vulnerability was found in the kernel's socket
recvmmsg subsystem. This may allow remote attackers to corrupt memory
and may allow execution of arbitrary code. This corruption takes place
during the error handling routines within __sys_recvmmsg() function.
(CVE-2016-7117, Important)

* A use-after-free vulnerability was found in
tcp_xmit_retransmit_queue and other tcp_* functions. This condition
could allow an attacker to send an incorrect selective acknowledgment
to existing connections, possibly resetting a connection.
(CVE-2016-6828, Moderate)

* A flaw was found in the Linux kernel's implementation of sctp
protocol in which a remote attacker can trigger an out of bounds read
with an offset of up to 64kB. This may panic the machine with a
page-fault. (CVE-2016-9555, Moderate)

Bug Fix(es) :

* Previously, console warnings from the real-time kernel were
generated when a sleeping lock was acquired in atomic context. With
this update, the code has been modified to not acquire a sleeping lock
in this context. As a result, the console warnings are no longer
generated. (BZ#1378982)

* Previously, the device mapper (DM) subsystem was not notified that
the real-time kernel changes the way preemption works with spinlocks.
This caused a kernel panic when the dm-multipath kernel module was
loaded because the interrupt request (IRQ) check was invalid on the
real-time kernel. This check has been corrected enabling the system to
boot correctly with the dm-multipath module enabled. (BZ#1400305)

* Previously, the kernel could sometimes panic due to a possible
division by zero in the scheduler. This bug has been fixed by defining
a new div64_ul() division function and correcting the affected
calculation in the proc_sched_show_task() function. (BZ#1400975)

* Unlike the standard Linux kernel, the real-time kernel does not
disable interrupts inside the Interrupt Service Routines driver.
Because of this difference, a New API (NAPI) function for turning
interrupt requests (IRQ) off was actually being called with IRQs
enabled. Consequently, the NAPI poll list was being corrupted, causing
improper networking card operation and potential kernel hangs. With
this update, the NAPI function has been corrected to force
modifications of the poll list to be protected allowing proper
operation of the networking card drivers. (BZ#1401779)

Enhancement(s) :

* With this update, the CONFIG_SLUB_DEBUG and CONFIG_SLABINFO kernel
configuration options are enabled in the real-time kernel. These
options turn on SLUB allocator debugging and slab information
tracking, which are helpful when investigating kernel memory
allocation problems. (BZ#1357997)"
  );
  # https://access.redhat.com/security/vulnerabilities/2706661
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/vulnerabilities/DirtyCow"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2017:0113"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-6828"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-7117"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-9555"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-13167"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  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:POC/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:P/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:"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-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-firmware");
  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-vanilla");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-vanilla-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-vanilla-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/10/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/01/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/01/18");
  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:"^6([^0-9]|$)", string:os_ver)) 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);

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-2016-6828", "CVE-2016-7117", "CVE-2016-9555", "CVE-2017-13167");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2017:0113");
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2017:0113";
  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_exists(release:"RHEL6", rpm:"mrg-release"))) audit(AUDIT_PACKAGE_NOT_INSTALLED, "MRG");

  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-debug-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-debug-debuginfo-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-debug-devel-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-debuginfo-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-debuginfo-common-x86_64-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-devel-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", reference:"kernel-rt-doc-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", reference:"kernel-rt-firmware-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-trace-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-trace-debuginfo-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-trace-devel-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-vanilla-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-vanilla-debuginfo-3.10.0-514.rt56.210.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-vanilla-devel-3.10.0-514.rt56.210.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-rt / kernel-rt-debug / kernel-rt-debug-debuginfo / etc");
  }
}