Scientific Linux Security Update : dhcp on SL7.x x86_64 (20161103)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text is (C) Scientific Linux.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(95836);
  script_version("3.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");

  script_cve_id("CVE-2016-2774");

  script_name(english:"Scientific Linux Security Update : dhcp on SL7.x x86_64 (20161103)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Scientific Linux host is missing one or more security
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Security Fix(es) :

  - A resource-consumption flaw was discovered in the DHCP
    server. dhcpd did not restrict the number of open
    connections to OMAPI and failover ports. A remote
    attacker able to establish TCP connections to one of
    these ports could use this flaw to cause dhcpd to exit
    unexpectedly, stop responding requests, or exhaust
    system sockets (denial of service). (CVE-2016-2774)

Additional Changes :"
  );
  # https://listserv.fnal.gov/scripts/wa.exe?A2=ind1612&L=scientific-linux-errata&F=&S=&P=4284
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?278f156b"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/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:fermilab:scientific_linux:dhclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:dhcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:dhcp-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:dhcp-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:dhcp-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:dhcp-libs");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/03/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/11/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/12/15");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Scientific Linux Local Security Checks");

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

  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) || "Scientific Linux " >!< release) audit(AUDIT_HOST_NOT, "running Scientific Linux");
os_ver = pregmatch(pattern: "Scientific Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Scientific Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Scientific Linux 7.x", "Scientific 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 (cpu >!< "x86_64" && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Scientific Linux", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);


flag = 0;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"dhclient-4.2.5-47.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"dhcp-4.2.5-47.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"dhcp-common-4.2.5-47.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"dhcp-debuginfo-4.2.5-47.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"dhcp-devel-4.2.5-47.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"dhcp-libs-4.2.5-47.el7")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  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-debuginfo / dhcp-devel / etc");
}