RHEL 7 / 8 : Ansible security update (2.9.18) (Moderate) (RHSA-2021:0664)

##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2021:0664. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(146821);
  script_version("1.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/04");

  script_cve_id(
    "CVE-2021-20178",
    "CVE-2021-20180",
    "CVE-2021-20191",
    "CVE-2021-20228"
  );
  script_xref(name:"RHSA", value:"2021:0664");
  script_xref(name:"IAVB", value:"2021-B-0013-S");

  script_name(english:"RHEL 7 / 8 : Ansible security update (2.9.18) (Moderate) (RHSA-2021:0664)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for Ansible.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2021:0664 advisory.

    Ansible is a simple model-driven configuration management, multi-node
    deployment, and remote-task execution system. Ansible works over SSH and
    does not require any software or daemons to be installed on remote nodes.
    Extension modules can be written in any language and are transferred to
    managed machines automatically.

    The following packages have been upgraded to a newer upstream version:
    ansible (2.9.18)

    Bug Fix(es):
    * CVE-2021-20178 ansible: user data leak in snmp_facts module
    * CVE-2021-20180 ansible module: bitbucket_pipeline_variable exposes
    secured values
    * CVE-2021-20191 ansible: multiple collections exposes secured values
    * CVE-2021-20228 ansible: basic.py no_log with fallback option

    See:
    https://github.com/ansible/ansible/blob/v2.9.18/changelogs/CHANGELOG-v2.9.rst
    for details on bug fixes in this release.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://access.redhat.com/security/data/csaf/v2/advisories/2021/rhsa-2021_0664.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1f099527");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#moderate");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2021:0664");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1914774");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1915808");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1916813");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1925002");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL Ansible package based on the guidance in RHSA-2021:0664.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-20228");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(522, 532);
  script_set_attribute(attribute:"vendor_severity", value:"Moderate");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/02/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/02/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/02/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ansible");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ansible-test");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('rpm.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release_list(operator: 'ge', os_version: os_ver, rhel_versions: ['7','8'])) audit(AUDIT_OS_NOT, 'Red Hat 7.x / 8.x', 'Red Hat ' + os_ver);

if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var 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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'repo_relative_urls': [
      'content/dist/layered/rhel8/aarch64/ansible/2.9/debug',
      'content/dist/layered/rhel8/aarch64/ansible/2.9/os',
      'content/dist/layered/rhel8/aarch64/ansible/2.9/source/SRPMS',
      'content/dist/layered/rhel8/ppc64le/ansible/2.9/debug',
      'content/dist/layered/rhel8/ppc64le/ansible/2.9/os',
      'content/dist/layered/rhel8/ppc64le/ansible/2.9/source/SRPMS',
      'content/dist/layered/rhel8/s390x/ansible/2.9/debug',
      'content/dist/layered/rhel8/s390x/ansible/2.9/os',
      'content/dist/layered/rhel8/s390x/ansible/2.9/source/SRPMS',
      'content/dist/layered/rhel8/x86_64/ansible/2.9/debug',
      'content/dist/layered/rhel8/x86_64/ansible/2.9/os',
      'content/dist/layered/rhel8/x86_64/ansible/2.9/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'ansible-2.9.18-1.el8ae', 'release':'8', 'el_string':'el8ae', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ansible-2.9'},
      {'reference':'ansible-test-2.9.18-1.el8ae', 'release':'8', 'el_string':'el8ae', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ansible-2.9'}
    ]
  },
  {
    'repo_relative_urls': [
      'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/ansible/2.9/debug',
      'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/ansible/2.9/os',
      'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/ansible/2.9/source/SRPMS',
      'content/dist/rhel/power-le/7/7Server/ppc64le/ansible/2.9/debug',
      'content/dist/rhel/power-le/7/7Server/ppc64le/ansible/2.9/os',
      'content/dist/rhel/power-le/7/7Server/ppc64le/ansible/2.9/source/SRPMS',
      'content/dist/rhel/server/7/7Server/x86_64/ansible/2.9/debug',
      'content/dist/rhel/server/7/7Server/x86_64/ansible/2.9/os',
      'content/dist/rhel/server/7/7Server/x86_64/ansible/2.9/source/SRPMS',
      'content/dist/rhel/system-z/7/7Server/s390x/ansible/2.9/debug',
      'content/dist/rhel/system-z/7/7Server/s390x/ansible/2.9/os',
      'content/dist/rhel/system-z/7/7Server/s390x/ansible/2.9/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'ansible-2.9.18-1.el7ae', 'release':'7', 'el_string':'el7ae', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ansible-2.9'},
      {'reference':'ansible-test-2.9.18-1.el7ae', 'release':'7', 'el_string':'el7ae', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ansible-2.9'}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var flag = 0;
foreach var constraint_array ( constraints ) {
  var repo_relative_urls = NULL;
  if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
  foreach var pkg ( constraint_array['pkgs'] ) {
    var reference = NULL;
    var _release = NULL;
    var sp = NULL;
    var _cpu = NULL;
    var el_string = NULL;
    var rpm_spec_vers_cmp = NULL;
    var epoch = NULL;
    var allowmaj = NULL;
    var exists_check = NULL;
    var cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        _release &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || rpm_exists(release:_release, rpm:exists_check))) &&
        rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ansible / ansible-test');
}