RHEL 7 : kernel-rt (RHSA-2018:2395) (Foreshadow)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2018:2395. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(111736);
  script_version("1.10");
  script_cvs_date("Date: 2019/10/24 15:35:45");

  script_cve_id("CVE-2017-13215", "CVE-2018-10675", "CVE-2018-3620", "CVE-2018-3646", "CVE-2018-3693", "CVE-2018-5390", "CVE-2018-7566");
  script_xref(name:"RHSA", value:"2018:2395");

  script_name(english:"RHEL 7 : kernel-rt (RHSA-2018:2395) (Foreshadow)");
  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.

Security Fix(es) :

* Modern operating systems implement virtualization of physical memory
to efficiently use available system resources and provide inter-domain
protection through access control and isolation. The L1TF issue was
found in the way the x86 microprocessor designs have implemented
speculative execution of instructions (a commonly used performance
optimisation) in combination with handling of page-faults caused by
terminated virtual to physical address resolving process. As a result,
an unprivileged attacker could use this flaw to read privileged memory
of the kernel or other processes and/or cross guest/host boundaries to
read host memory by conducting targeted cache side-channel attacks.
(CVE-2018-3620, CVE-2018-3646)

* An industry-wide issue was found in the way many modern
microprocessor designs have implemented speculative execution of
instructions past bounds check. The flaw relies on the presence of a
precisely-defined instruction sequence in the privileged code and the
fact that memory writes occur to an address which depends on the
untrusted value. Such writes cause an update into the microprocessor's
data cache even for speculatively executed instructions that never
actually commit (retire). As a result, an unprivileged attacker could
use this flaw to influence speculative execution and/or read
privileged memory by conducting targeted cache side-channel attacks.
(CVE-2018-3693)

* A flaw named SegmentSmack was found in the way the Linux kernel
handled specially crafted TCP packets. A remote attacker could use
this flaw to trigger time and calculation expensive calls to
tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by
sending specially modified packets within ongoing TCP sessions which
could lead to a CPU saturation and hence a denial of service on the
system. Maintaining the denial of service condition requires
continuous two-way TCP sessions to a reachable open port, thus the
attacks cannot be performed using spoofed IP addresses.
(CVE-2018-5390)

* kernel: crypto: privilege escalation in skcipher_recvmsg function
(CVE-2017-13215)

* kernel: mm: use-after-free in do_get_mempolicy function allows local
DoS or other unspecified impact (CVE-2018-10675)

* kernel: race condition in snd_seq_write() may lead to UAF or OOB
access (CVE-2018-7566)

For more details about the security issue(s), including the impact, a
CVSS score, and other related information, refer to the CVE page(s)
listed in the References section.

Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting
CVE-2018-3620 and CVE-2018-3646; Vladimir Kiriansky (MIT) and Carl
Waldspurger (Carl Waldspurger Consulting) for reporting CVE-2018-3693;
and Juha-Matti Tilli (Aalto University, Department of Communications
and Networking and Nokia Bell Labs) for reporting CVE-2018-5390.

Bug Fix(es) :

* The kernel-rt packages have been upgraded to the 3.10.0-862.10.2
source tree, which provides a number of bug fixes over the previous
version. (BZ# 1594915)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/vulnerabilities/L1TF"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2018:2395"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-13215"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-3620"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-3646"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-3693"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-5390"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-7566"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-10675"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A: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_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:"2018/01/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/08/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/08/15");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2019 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-2017-13215", "CVE-2018-10675", "CVE-2018-3620", "CVE-2018-3646", "CVE-2018-3693", "CVE-2018-5390", "CVE-2018-7566");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2018:2395");
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2018:2395";
  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-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-debuginfo-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-devel-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-kvm-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debug-kvm-debuginfo-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debuginfo-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-debuginfo-common-x86_64-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-devel-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", reference:"kernel-rt-doc-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-kvm-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-kvm-debuginfo-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-debuginfo-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-devel-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-kvm-3.10.0-862.11.6.rt56.819.el7")) flag++;
  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"kernel-rt-trace-kvm-debuginfo-3.10.0-862.11.6.rt56.819.el7")) 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");
  }
}