RHEL 7 : microcode_ctl (RHSA-2020:2758)

2020-06-29T00:00:00
ID REDHAT-RHSA-2020-2758.NASL
Type nessus
Reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-06-29T00:00:00

Description

The remote Redhat Enterprise Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2020:2758 advisory.

  • hw: Special Register Buffer Data Sampling (SRBDS) (CVE-2020-0543)

  • hw: Vector Register Data Sampling (CVE-2020-0548)

  • hw: L1D Cache Eviction Sampling (CVE-2020-0549)

Note that Nessus has not tested for this issue but has instead relied only on the application

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:2758. The text
# itself is copyright (C) Red Hat, Inc.
#

include('compat.inc');

if (description)
{
  script_id(137883);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/07/03");

  script_cve_id("CVE-2020-0543", "CVE-2020-0548", "CVE-2020-0549");
  script_xref(name:"RHSA", value:"2020:2758");

  script_name(english:"RHEL 7 : microcode_ctl (RHSA-2020:2758)");
  script_summary(english:"Checks the rpm output for the updated package");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 7 host has a package installed that is affected by multiple vulnerabilities as
referenced in the RHSA-2020:2758 advisory.

  - hw: Special Register Buffer Data Sampling (SRBDS)
    (CVE-2020-0543)

  - hw: Vector Register Data Sampling (CVE-2020-0548)

  - hw: L1D Cache Eviction Sampling (CVE-2020-0549)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/200.html");
  script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/203.html");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-0543");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-0548");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-0549");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2020:2758");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1788786");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1788788");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1827165");
  script_set_attribute(attribute:"solution", value:
"Update the affected microcode_ctl package.");
  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:"cvss_score_source", value:"CVE-2020-0549");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(200, 203);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/01/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/06/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:7.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:7.7::computenode");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:7.7::server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:microcode_ctl");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.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');

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\.7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Red Hat 7.7', '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 && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

pkgs = [
    {'reference':'microcode_ctl-2.1-53.9.el7_7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'}
];

flag = 0;
foreach package_array ( pkgs ) {
  reference = NULL;
  release = NULL;
  sp = NULL;
  cpu = NULL;
  el_string = NULL;
  rpm_spec_vers_cmp = NULL;
  epoch = NULL;
  allowmaj = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = 'RHEL' + package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (reference && release) {
    if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) 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, 'microcode_ctl');
}