CentOS 6 : dhcp (CESA-2011:1819)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2011:1819 and 
# CentOS Errata and Security Advisory 2011:1819 respectively.
#

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

if (description)
{
  script_id(57380);
  script_version("1.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2011-4539");
  script_bugtraq_id(50971);
  script_xref(name:"RHSA", value:"2011:1819");

  script_name(english:"CentOS 6 : dhcp (CESA-2011:1819)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated dhcp packages that fix one security issue are now available
for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having
moderate security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from
the CVE link 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.

A denial of service flaw was found in the way the dhcpd daemon handled
DHCP request packets when regular expression matching was used in
'/etc/dhcp/dhcpd.conf'. A remote attacker could use this flaw to crash
dhcpd. (CVE-2011-4539)

Users of DHCP should upgrade to these updated packages, which contain
a backported patch to correct this issue. After installing this
update, all DHCP servers will be restarted automatically."
  );
  # https://lists.centos.org/pipermail/centos-announce/2011-December/018339.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?48c2183d"
  );
  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_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dhclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dhcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dhcp-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:dhcp-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");

  script_set_attribute(attribute:"vuln_publication_date", value:"2011/12/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2011/12/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/12/23");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2011-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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);
release = get_kb_item("Host/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 6.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/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, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-6", reference:"dhclient-4.1.1-25.P1.el6_2.1")) flag++;
if (rpm_check(release:"CentOS-6", reference:"dhcp-4.1.1-25.P1.el6_2.1")) flag++;
if (rpm_check(release:"CentOS-6", reference:"dhcp-common-4.1.1-25.P1.el6_2.1")) flag++;
if (rpm_check(release:"CentOS-6", reference:"dhcp-devel-4.1.1-25.P1.el6_2.1")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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-devel");
}