RHEL 5 / 6 / 7 : glibc (CVE-2014-9402)

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(88862);
  script_version("1.7");
  script_cvs_date("Date: 2018/07/25 18:58:06");

  script_cve_id("CVE-2014-9402");
  script_bugtraq_id(71670);

  script_name(english:"RHEL 5 / 6 / 7 : glibc (CVE-2014-9402)");
  script_summary(english:"Checks the rpm output for the updated packages.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is potentially affected by a denial of service
vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote Red Hat Enterprise Linux host has a version of glibc
installed that is similar in patching level to version 2.21 of the
official glibc library. It is, therefore, potentially affected by a
denial of service vulnerability due to improper handling of alias
names supplied to the getnetbyname() function. A remote attacker can
exploit this to cause an invite loop by sending a positive answer to
the host while a network name is being processed.

Note that Red Hat has no plans to release a patch since the host will
only be affected by the vulnerability if it is running a 'networks:
file dns' non-standard configuration in /etc/nsswitch.conf, and the
host is targeted by a separate DNS spoofing attack.");
  script_set_attribute(attribute:"see_also", value:"https://www.redhat.com/security/data/cve/CVE-2014-9402.html");
  script_set_attribute(attribute:"solution", value:
"No patch from Red Hat is currently available. However, users are
advised to check their settings, and upgrade to a glibc package
released after February, 2nd 2015.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/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:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:glibc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/02/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/02/19");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.");
  script_family(english:"Red Hat Local Security Checks");

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

  exit(0);
}

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

if (report_paranoia < 2) audit(AUDIT_PARANOID);

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 = eregmatch(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 (! ereg(pattern:"^(5|6|7)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 5.x / 6.x / 7.x", "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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);

flag = 0;
if (rpm_check(release:"RHEL5", reference:"glibc-2.5-123.el5_11.3")) flag++;
if (rpm_check(release:"RHEL6", reference:"glibc-2.12-1.149.el6_6.7")) flag++;
if (rpm_check(release:"RHEL7", reference:"glibc-2.17-78.el7")) flag++;

if (flag)
{
  report_extra = rpm_report_get() +
                 'NOTE: No official Red Hat Security Advisory exists for this vulnerability.\n' +
                 'Consult https://access.redhat.com/security/cve/CVE-2014-9402 for details.\n';
  if (report_verbosity > 0) security_note(port:0, extra:report_extra);
  else security_note(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "glibc");
}