RHEL 7 : bind (RHSA-2017:2533)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2017:2533. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(102726);
  script_version("3.10");
  script_cvs_date("Date: 2019/10/24 15:35:43");

  script_cve_id("CVE-2016-2775");
  script_xref(name:"RHSA", value:"2017:2533");

  script_name(english:"RHEL 7 : bind (RHSA-2017:2533)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An update for bind is now available for Red Hat Enterprise Linux 7.2
Extended Update Support and Red Hat Enterprise Linux 7.3 Extended
Update Support.

Red Hat Product Security has rated this update as having a security
impact of Moderate. 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 Berkeley Internet Name Domain (BIND) is an implementation of the
Domain Name System (DNS) protocols. BIND includes a DNS server
(named); a resolver library (routines for applications to use when
interfacing with DNS); and tools for verifying that the DNS server is
operating correctly.

Security Fix(es) :

* It was found that the lightweight resolver protocol implementation
in BIND could enter an infinite recursion and crash when asked to
resolve a query name which, when combined with a search list entry,
exceeds the maximum allowable length. A remote attacker could use this
flaw to crash lwresd or named when using the 'lwres' statement in
named.conf. (CVE-2016-2775)"
  );
  # https://kb.isc.org/article/AA-01393/
  script_set_attribute(
    attribute:"see_also",
    value:"https://kb.isc.org/docs/aa-01393"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2017:2533"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-2775"
  );
  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: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:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/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:redhat:enterprise_linux:bind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-chroot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-libs-lite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-license");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-lite-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-pkcs11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-pkcs11-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-pkcs11-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-pkcs11-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-sdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-sdb-chroot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.3");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/07/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/08/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/24");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  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");

  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) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(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 (! preg(pattern:"^(7\.2|7\.3)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 7.2 / 7.3", "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);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2017:2533";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{  sp = get_kb_item("Host/RedHat/minor_release");
  if (isnull(sp)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");

  flag = 0;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"s390x", reference:"bind-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"s390x", reference:"bind-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"x86_64", reference:"bind-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"x86_64", reference:"bind-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"s390x", reference:"bind-chroot-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"s390x", reference:"bind-chroot-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"x86_64", reference:"bind-chroot-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"x86_64", reference:"bind-chroot-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", reference:"bind-debuginfo-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", reference:"bind-debuginfo-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", reference:"bind-devel-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", reference:"bind-devel-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", reference:"bind-libs-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", reference:"bind-libs-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", reference:"bind-libs-lite-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", reference:"bind-libs-lite-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", reference:"bind-license-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", reference:"bind-license-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", reference:"bind-lite-devel-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", reference:"bind-lite-devel-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"s390x", reference:"bind-pkcs11-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"s390x", reference:"bind-pkcs11-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"x86_64", reference:"bind-pkcs11-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"x86_64", reference:"bind-pkcs11-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", reference:"bind-pkcs11-devel-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", reference:"bind-pkcs11-devel-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", reference:"bind-pkcs11-libs-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", reference:"bind-pkcs11-libs-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"s390x", reference:"bind-pkcs11-utils-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"s390x", reference:"bind-pkcs11-utils-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"x86_64", reference:"bind-pkcs11-utils-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"x86_64", reference:"bind-pkcs11-utils-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"s390x", reference:"bind-sdb-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"s390x", reference:"bind-sdb-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"x86_64", reference:"bind-sdb-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"x86_64", reference:"bind-sdb-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"s390x", reference:"bind-sdb-chroot-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"s390x", reference:"bind-sdb-chroot-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"x86_64", reference:"bind-sdb-chroot-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"x86_64", reference:"bind-sdb-chroot-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"s390x", reference:"bind-utils-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"s390x", reference:"bind-utils-9.9.4-29.el7_2.7")) flag++;
  if (rpm_check(release:"RHEL7", sp:"3", cpu:"x86_64", reference:"bind-utils-9.9.4-50.el7_3.2")) flag++;
  if (rpm_check(release:"RHEL7", sp:"2", cpu:"x86_64", reference:"bind-utils-9.9.4-29.el7_2.7")) flag++;

  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "bind / bind-chroot / bind-debuginfo / bind-devel / bind-libs / etc");
  }
}