Oracle Linux 7 : ntp (ELSA-2020-2663)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:2663 and 
# Oracle Linux Security Advisory ELSA-2020-2663 respectively.
#

include("compat.inc");

if (description)
{
  script_id(137819);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/07/01");

  script_cve_id("CVE-2020-11868", "CVE-2020-13817");
  script_xref(name:"RHSA", value:"2020:2663");

  script_name(english:"Oracle Linux 7 : ntp (ELSA-2020-2663)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Oracle Linux host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description",
    value:
"From Red Hat Security Advisory 2020:2663 :

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2020:2663 advisory.

  - ntp: DoS on client ntpd using server mode packet
    (CVE-2020-11868)

  - ntp: ntpd using highly predictable transmit timestamps
    could result in time change or DoS (CVE-2020-13817)

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://oss.oracle.com/pipermail/el-errata/2020-June/010079.html"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected ntp packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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-2020-13817");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:ntp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:ntp-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:ntp-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:ntpdate");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:sntp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/06/25");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Oracle Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/OracleLinux")) audit(AUDIT_OS_NOT, "Oracle Linux");
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, "Oracle Linux");
os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Oracle Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Oracle Linux 7", "Oracle Linux " + 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Oracle Linux", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);

flag = 0;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"ntp-4.2.6p5-29.0.1.el7_8.2")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"ntp-doc-4.2.6p5-29.0.1.el7_8.2")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"ntp-perl-4.2.6p5-29.0.1.el7_8.2")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"ntpdate-4.2.6p5-29.0.1.el7_8.2")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"sntp-4.2.6p5-29.0.1.el7_8.2")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ntp / ntp-doc / ntp-perl / ntpdate / sntp");
}