RHEL 7 : kernel (RHSA-2019:0324)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2019:0324. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(122142);
  script_version("1.7");
  script_cvs_date("Date: 2019/10/24 15:35:46");

  script_cve_id("CVE-2018-18397");
  script_xref(name:"RHSA", value:"2019:0324");

  script_name(english:"RHEL 7 : kernel (RHSA-2019:0324)");
  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 7.4
Extended Update Support.

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

Security Fix(es) :

* kernel: userfaultfd bypasses tmpfs file permissions (CVE-2018-18397)

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.

Bug Fix(es) :

* The timeout handling in the libfc.ko kernel module did not work
correctly. This was happening during certain steps of the Fibre
Channel login procedure, when the timeout handling was not
synchronized with the state of a partially offloaded Fibre Channel
over Ethernet (FCoE) in the lower-level driver. Consequently, the
offloaded FCoE state was incorrect, which led to I/O timeout errors
until the SCSI error recovery issued a host reset. This update fixes
the bug by improving the libfc.ko error handling during the fabric
login. As a result, the fabric login errors are addressed in time,
without the I/O timeouts in the described scenario. (BZ#1655042)

* Symmetric Multi-Processing (SMP) or Non-Uniform Memory Access (NUMA)
systems in some cases experienced deadlocks during a task migration
and task wakeup operations. Consequently, the systems terminated
unexpectedly with the following message :

NMI watchdog: Watchdog detected hard LOCKUP on

This update fixes the bug by queueing the stopper thread to run after
locks are released. As a result, the deadlocks and the system crashes
no longer occur in the described scenario. (BZ#1667326)

Users of kernel are advised to upgrade to these updated packages,
which fix these bugs."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2019:0324"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-18397"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N");
  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");
  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-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-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:kernel-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs-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:7.4");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/02/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/13");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 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\.4([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 7.4", "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-2018-18397");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2019:0324");
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2019:0324";
  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", sp:"4", cpu:"s390x", reference:"kernel-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", reference:"kernel-abi-whitelists-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-debug-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-debug-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-debug-debuginfo-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-debug-debuginfo-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-debug-devel-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-debug-devel-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-debuginfo-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-debuginfo-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-debuginfo-common-s390x-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-debuginfo-common-x86_64-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-devel-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-devel-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", reference:"kernel-doc-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-headers-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-headers-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-kdump-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-kdump-debuginfo-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"kernel-kdump-devel-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-tools-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-tools-debuginfo-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-tools-libs-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"kernel-tools-libs-devel-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"perf-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"perf-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"perf-debuginfo-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"perf-debuginfo-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"python-perf-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"python-perf-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"s390x", reference:"python-perf-debuginfo-3.10.0-693.44.1.el7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"4", cpu:"x86_64", reference:"python-perf-debuginfo-3.10.0-693.44.1.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 / kernel-abi-whitelists / kernel-debug / etc");
  }
}