Oracle Linux 7 : dhcp (ELSA-2018-0483)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2018:0483 and 
# Oracle Linux Security Advisory ELSA-2018-0483 respectively.
#

include("compat.inc");

if (description)
{
  script_id(108273);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/07/10");

  script_cve_id("CVE-2018-5732", "CVE-2018-5733");
  script_xref(name:"RHSA", value:"2018:0483");
  script_xref(name:"IAVB", value:"2018-B-0034-S");

  script_name(english:"Oracle Linux 7 : dhcp (ELSA-2018-0483)");
  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 2018:0483 :

An update for dhcp 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 Dynamic Host Configuration Protocol (DHCP) is a protocol that
allows individual devices on an IP network to get their own network
configuration information, including an IP address, a subnet mask, and
a broadcast address. The dhcp packages provide a relay agent and ISC
DHCP service required to enable and administer DHCP on a network.

Security Fix(es) :

* dhcp: Buffer overflow in dhclient possibly allowing code execution
triggered by malicious server (CVE-2018-5732)

* dhcp: Reference count overflow in dhcpd allows denial of service
(CVE-2018-5733)

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 ISC for reporting these issues. Upstream
acknowledges Felix Wilhelm (Google) as the original reporter of these
issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://oss.oracle.com/pipermail/el-errata/2018-March/007571.html"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected dhcp packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dhclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dhcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dhcp-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dhcp-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:dhcp-libs");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/03/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/03/13");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2020 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:"dhclient-4.2.5-58.0.1.el7_4.3")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"dhcp-4.2.5-58.0.1.el7_4.3")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"dhcp-common-4.2.5-58.0.1.el7_4.3")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"dhcp-devel-4.2.5-58.0.1.el7_4.3")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"dhcp-libs-4.2.5-58.0.1.el7_4.3")) 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, "dhclient / dhcp / dhcp-common / dhcp-devel / dhcp-libs");
}