RHEL 6 : kernel (RHSA-2019:4256)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2019:4256. The text 
# itself is copyright (C) Red Hat, Inc.
#

include('compat.inc');

if (description)
{
  script_id(132233);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/03");

  script_cve_id("CVE-2019-14821");
  script_xref(name:"RHSA", value:"2019:4256");

  script_name(english:"RHEL 6 : kernel (RHSA-2019:4256)");

  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 6.

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

Security Fix(es) :

* Kernel: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821)

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

Bug Fix(es) :

* KEYS: prevent creating a different user's keyrings RHEL-6.10
(BZ#1537371)

* BUG: unable to handle kernel NULL pointer dereference at (null) (BZ#
1733760)

* long I/O stalls with bnx2fc from not masking off scope bits of retry
delay value (BZ#1749512)");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2019:4256");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2019-14821");
  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:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-14821");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/09/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/12/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/18");

  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-i686");
  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-firmware");
  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: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:6");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  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-2019-14821");
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2019:4256");
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2019:4256";
  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:"RHEL6", cpu:"i686", reference:"kernel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", reference:"kernel-abi-whitelists-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-debug-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-debug-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-debug-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-debug-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-debug-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-debug-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-debug-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-debug-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-debug-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-debuginfo-common-i686-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-debuginfo-common-s390x-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-debuginfo-common-x86_64-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", reference:"kernel-doc-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", reference:"kernel-firmware-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"kernel-headers-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-headers-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-headers-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-kdump-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-kdump-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"kernel-kdump-devel-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"perf-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"perf-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"perf-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"python-perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"python-perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"python-perf-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"python-perf-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"python-perf-debuginfo-2.6.32-754.25.1.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"python-perf-debuginfo-2.6.32-754.25.1.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 / kernel-abi-whitelists / kernel-debug / etc");
  }
}