NewStart CGSL CORE 5.04 / MAIN 5.04 : bind Multiple Vulnerabilities (NS-SA-2020-0063)

##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2020-0063. The text
# itself is copyright (C) ZTE, Inc.
##

include('compat.inc');

if (description)
{
  script_id(143897);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/12/10");

  script_cve_id(
    "CVE-2018-5745",
    "CVE-2019-6465",
    "CVE-2019-6477",
    "CVE-2020-8616",
    "CVE-2020-8617"
  );
  script_bugtraq_id(107140, 107142);

  script_name(english:"NewStart CGSL CORE 5.04 / MAIN 5.04 : bind Multiple Vulnerabilities (NS-SA-2020-0063)");

  script_set_attribute(attribute:"synopsis", value:
"The remote machine is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has bind packages installed that are affected by
multiple vulnerabilities:

  - managed-keys is a feature which allows a BIND resolver to automatically maintain the keys used by trust
    anchors which operators configure for use in DNSSEC validation. Due to an error in the managed-keys
    feature it is possible for a BIND server which uses managed-keys to exit due to an assertion failure if,
    during key rollover, a trust anchor's keys are replaced with keys which use an unsupported algorithm.
    Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.5-P1, 9.12.0 -> 9.12.3-P1, and versions
    9.9.3-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition. Versions 9.13.0 -> 9.13.6 of the 9.13
    development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for
    vulnerability to CVE-2018-5745. (CVE-2018-5745)

  - Controls for zone transfers may not be properly applied to Dynamically Loadable Zones (DLZs) if the zones
    are writable Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.5-P2, 9.12.0 -> 9.12.3-P2, and
    versions 9.9.3-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition. Versions 9.13.0 -> 9.13.6 of the 9.13
    development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for
    vulnerability to CVE-2019-6465. (CVE-2019-6465)

  - With pipelining enabled each incoming query on a TCP connection requires a similar resource allocation to
    a query received via UDP or via TCP without pipelining enabled. A client using a TCP-pipelined connection
    to a server could consume more resources than the server has been provisioned to handle. When a TCP
    connection with a large number of pipelined queries is closed, the load on the server releasing these
    multiple resources can cause it to become unresponsive, even for queries that can be answered
    authoritatively or from cache. (This is most likely to be perceived as an intermittent server problem).
    (CVE-2019-6477)

  - Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an
    inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the
    server. Since BIND, by default, configures a local session key even on servers whose configuration does
    not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating
    from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately
    exits. Prior to the introduction of the check the server would continue operating in an inconsistent
    state, with potentially harmful results. (CVE-2020-8617)

  - A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches
    performed when processing referrals can, through the use of specially crafted referrals, cause a recursing
    server to issue a very large number of fetches in an attempt to process the referral. This has at least
    two potential effects: The performance of the recursing server can potentially be degraded by the
    additional work required to perform these fetches, and The attacker can exploit this behavior to use the
    recursing server as a reflector in a reflection attack with a high amplification factor. (CVE-2020-8616)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"http://security.gd-linux.com/notice/NS-SA-2020-0063");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL bind packages. Note that updated packages may not be available yet. Please contact ZTE for
more information.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-6465");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/02/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/12/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/12/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"NewStart CGSL Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  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/ZTE-CGSL/release');
if (isnull(release) || release !~ "^CGSL (MAIN|CORE)") audit(AUDIT_OS_NOT, 'NewStart Carrier Grade Server Linux');

if (release !~ "CGSL CORE 5.04" &&
    release !~ "CGSL MAIN 5.04")
  audit(AUDIT_OS_NOT, 'NewStart CGSL CORE 5.04 / NewStart CGSL MAIN 5.04');

if (!get_kb_item('Host/ZTE-CGSL/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, 'NewStart Carrier Grade Server Linux', cpu);

flag = 0;

pkgs = {
  'CGSL CORE 5.04': [
    'bind-9.11.4-16.P2.el7_8.6',
    'bind-chroot-9.11.4-16.P2.el7_8.6',
    'bind-debuginfo-9.11.4-16.P2.el7_8.6',
    'bind-devel-9.11.4-16.P2.el7_8.6',
    'bind-export-devel-9.11.4-16.P2.el7_8.6',
    'bind-export-libs-9.11.4-16.P2.el7_8.6',
    'bind-libs-9.11.4-16.P2.el7_8.6',
    'bind-libs-lite-9.11.4-16.P2.el7_8.6',
    'bind-license-9.11.4-16.P2.el7_8.6',
    'bind-lite-devel-9.11.4-16.P2.el7_8.6',
    'bind-pkcs11-9.11.4-16.P2.el7_8.6',
    'bind-pkcs11-devel-9.11.4-16.P2.el7_8.6',
    'bind-pkcs11-libs-9.11.4-16.P2.el7_8.6',
    'bind-pkcs11-utils-9.11.4-16.P2.el7_8.6',
    'bind-sdb-9.11.4-16.P2.el7_8.6',
    'bind-sdb-chroot-9.11.4-16.P2.el7_8.6',
    'bind-utils-9.11.4-16.P2.el7_8.6'
  ],
  'CGSL MAIN 5.04': [
    'bind-9.11.4-16.P2.el7_8.6',
    'bind-chroot-9.11.4-16.P2.el7_8.6',
    'bind-debuginfo-9.11.4-16.P2.el7_8.6',
    'bind-devel-9.11.4-16.P2.el7_8.6',
    'bind-export-devel-9.11.4-16.P2.el7_8.6',
    'bind-export-libs-9.11.4-16.P2.el7_8.6',
    'bind-libs-9.11.4-16.P2.el7_8.6',
    'bind-libs-lite-9.11.4-16.P2.el7_8.6',
    'bind-license-9.11.4-16.P2.el7_8.6',
    'bind-lite-devel-9.11.4-16.P2.el7_8.6',
    'bind-pkcs11-9.11.4-16.P2.el7_8.6',
    'bind-pkcs11-devel-9.11.4-16.P2.el7_8.6',
    'bind-pkcs11-libs-9.11.4-16.P2.el7_8.6',
    'bind-pkcs11-utils-9.11.4-16.P2.el7_8.6',
    'bind-sdb-9.11.4-16.P2.el7_8.6',
    'bind-sdb-chroot-9.11.4-16.P2.el7_8.6',
    'bind-utils-9.11.4-16.P2.el7_8.6'
  ]
};
pkg_list = pkgs[release];

foreach (pkg in pkg_list)
  if (rpm_check(release:'ZTE ' + release, reference:pkg)) 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, 'bind');
}