SUSE SLES11 Security Update : bind (SUSE-SU-2020:14400-1)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2020:14400-1. The text itself
# is copyright (C) SUSE.
##

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

if (description)
{
  script_id(150635);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/01/21");

  script_cve_id("CVE-2018-5741", "CVE-2020-8616", "CVE-2020-8617");
  script_xref(name:"SuSE", value:"SUSE-SU-2020:14400-1");
  script_xref(name:"IAVA", value:"2018-A-0303-S");
  script_xref(name:"IAVA", value:"2020-A-0217-S");

  script_name(english:"SUSE SLES11 Security Update : bind (SUSE-SU-2020:14400-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote SUSE host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in
the SUSE-SU-2020:14400-1 advisory.

  - To provide fine-grained controls over the ability to use Dynamic DNS (DDNS) to update records in a zone,
    BIND 9 provides a feature called update-policy. Various rules can be configured to limit the types of
    updates that can be performed by a client, depending on the key used when sending the update request.
    Unfortunately, some rule types were not initially documented, and when documentation for them was added to
    the Administrator Reference Manual (ARM) in change #3112, the language that was added to the ARM at that
    time incorrectly described the behavior of two rule types, krb5-subdomain and ms-subdomain. This incorrect
    documentation could mislead operators into believing that policies they had configured were more
    restrictive than they actually were. This affects BIND versions prior to BIND 9.11.5 and BIND 9.12.3.
    (CVE-2018-5741)

  - 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)

  - 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)

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:"https://bugzilla.suse.com/1033843");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1092283");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1109160");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1171740");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1172220");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1172680");
  # https://lists.suse.com/pipermail/sle-security-updates/2020-June/006991.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d22f7404");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2018-5741");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2020-8616");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2020-8617");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:P/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:L/UI:N/S:U/C:N/I:H/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-2018-5741");

  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:"2018/09/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/06/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:bind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:bind-chrootenv");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:bind-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:bind-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:bind-libs-32bit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:bind-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:11");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/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/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'SUSE');
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES11)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES11', 'SUSE ' + os_ver);

if (!get_kb_item("Host/SuSE/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 && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'SUSE ' + os_ver, cpu);

sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES11" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLES11 SP4", os_ver + " SP" + sp);

pkgs = [
    {'reference':'bind-9.9.6P1-0.51.20', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'SLES_SAP-release-11.4'},
    {'reference':'bind-chrootenv-9.9.6P1-0.51.20', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'SLES_SAP-release-11.4'},
    {'reference':'bind-doc-9.9.6P1-0.51.20', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'SLES_SAP-release-11.4'},
    {'reference':'bind-libs-32bit-9.9.6P1-0.51.20', 'sp':'4', 'cpu':'s390x', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'SLES_SAP-release-11.4'},
    {'reference':'bind-libs-32bit-9.9.6P1-0.51.20', 'sp':'4', 'cpu':'x86_64', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'SLES_SAP-release-11.4'},
    {'reference':'bind-libs-9.9.6P1-0.51.20', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'SLES_SAP-release-11.4'},
    {'reference':'bind-utils-9.9.6P1-0.51.20', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'SLES_SAP-release-11.4'},
    {'reference':'bind-9.9.6P1-0.51.20', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sles-release-11.4'},
    {'reference':'bind-chrootenv-9.9.6P1-0.51.20', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sles-release-11.4'},
    {'reference':'bind-doc-9.9.6P1-0.51.20', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sles-release-11.4'},
    {'reference':'bind-libs-32bit-9.9.6P1-0.51.20', 'sp':'4', 'cpu':'s390x', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sles-release-11.4'},
    {'reference':'bind-libs-32bit-9.9.6P1-0.51.20', 'sp':'4', 'cpu':'x86_64', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sles-release-11.4'},
    {'reference':'bind-libs-9.9.6P1-0.51.20', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sles-release-11.4'},
    {'reference':'bind-utils-9.9.6P1-0.51.20', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sles-release-11.4'}
];

flag = 0;
foreach package_array ( pkgs ) {
  reference = NULL;
  release = NULL;
  sp = NULL;
  cpu = NULL;
  exists_check = NULL;
  rpm_spec_vers_cmp = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (reference && release && exists_check) {
    if (rpm_exists(release:release, rpm:exists_check) && rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) flag++;
  }
  else if (reference && release) {
    if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) flag++;
  }
}

if (flag)
{
  ltss_plugin_caveat = '\n' +
    'NOTE: This vulnerability check contains fixes that apply to\n' +
    'packages only available in SUSE Enterprise Linux Server LTSS\n' +
    'repositories. Access to these package security updates require\n' +
    'a paid SUSE LTSS subscription.\n';
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get() + ltss_plugin_caveat
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'bind / bind-chrootenv / bind-doc / bind-libs / bind-libs-32bit / etc');
}