Oracle Linux 8 : container-tools:2.0 (ELSA-2021-0706)

##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2021-0706.
##

include('compat.inc');

if (description)
{
  script_id(147170);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/09/22");

  script_cve_id("CVE-2021-20188");

  script_name(english:"Oracle Linux 8 : container-tools:2.0 (ELSA-2021-0706)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the
ELSA-2021-0706 advisory.

  - A flaw was found in podman before 1.7.0. File permissions for non-root users running in a privileged
    container are not correctly checked. This flaw can be abused by a low-privileged user inside the container
    to access any other file in the container, even if owned by the root user inside the container. It does
    not allow to directly escape the container, though being a privileged container means that a lot of
    security features are disabled when running the container. The highest threat from this vulnerability is
    to data confidentiality and integrity as well as system availability. (CVE-2021-20188)

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://linux.oracle.com/errata/ELSA-2021-0706.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-20188");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/02/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/03/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:buildah");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:buildah-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:cockpit-podman");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:conmon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:container-selinux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:containernetworking-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:containers-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:crit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:criu");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:fuse-overlayfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:podman");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:podman-docker");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:podman-remote");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:podman-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:python-podman-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:python3-criu");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:runc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:skopeo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:skopeo-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:slirp4netns");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:udica");
  script_end_attributes();

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

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

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

  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);
if (!get_kb_item('Host/OracleLinux')) audit(AUDIT_OS_NOT, 'Oracle Linux');
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, 'Oracle Linux');
os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
os_ver = os_ver[1];
if (! preg(pattern:"^8([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 8', 'Oracle Linux ' + 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$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Oracle Linux', cpu);

module_ver = get_kb_item('Host/RedHat/appstream/container-tools');
if (isnull(module_ver)) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module container-tools:2.0');
if ('2.0' >!< module_ver) audit(AUDIT_PACKAGE_NOT_AFFECTED, 'Module container-tools:' + module_ver);

appstreams = {
    'container-tools:2.0': [
      {'reference':'buildah-1.11.6-8.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'buildah-1.11.6-8.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'buildah-tests-1.11.6-8.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'buildah-tests-1.11.6-8.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'cockpit-podman-11-1.module+el8.3.0+9670+b9fad87d', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'conmon-2.0.15-1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'conmon-2.0.15-1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'container-selinux-2.130.0-1.module+el8.3.0+9670+b9fad87d', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'containernetworking-plugins-0.8.3-4.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'containernetworking-plugins-0.8.3-4.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'containers-common-0.1.41-4.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'containers-common-0.1.41-4.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'crit-3.12-9.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'crit-3.12-9.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'criu-3.12-9.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'criu-3.12-9.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'fuse-overlayfs-0.7.8-1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'fuse-overlayfs-0.7.8-1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'podman-1.6.4-26.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'podman-1.6.4-26.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'podman-docker-1.6.4-26.0.1.module+el8.3.0+9670+b9fad87d', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'podman-remote-1.6.4-26.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'podman-remote-1.6.4-26.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'podman-tests-1.6.4-26.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'podman-tests-1.6.4-26.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python-podman-api-1.2.0-0.2.gitd0a45fe.module+el8.3.0+9670+b9fad87d', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-criu-3.12-9.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-criu-3.12-9.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'runc-1.0.0-64.rc10.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'rc_precedence':TRUE},
      {'reference':'runc-1.0.0-64.rc10.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'rc_precedence':TRUE},
      {'reference':'skopeo-0.1.41-4.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'skopeo-0.1.41-4.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'skopeo-tests-0.1.41-4.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'skopeo-tests-0.1.41-4.0.1.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'slirp4netns-0.4.2-3.git21fdece.module+el8.3.0+9670+b9fad87d', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'slirp4netns-0.4.2-3.git21fdece.module+el8.3.0+9670+b9fad87d', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'udica-0.2.1-2.module+el8.3.0+9670+b9fad87d', 'release':'8', 'rpm_spec_vers_cmp':TRUE}
    ]
};

flag = 0;
appstreams_found = 0;
foreach module (keys(appstreams)) {
  appstream = NULL;
  appstream_name = NULL;
  appstream_version = NULL;
  appstream_split = split(module, sep:':', keep:FALSE);
  if (!empty_or_null(appstream_split)) {
    appstream_name = appstream_split[0];
    appstream_version = appstream_split[1];
    if (!empty_or_null(appstream_name)) appstream = get_one_kb_item('Host/RedHat/appstream/' + appstream_name);
  }
  if (!empty_or_null(appstream) && appstream_version == appstream || appstream_name == 'all') {
    appstreams_found++;
    foreach package_array ( appstreams[module] ) {
      reference = NULL;
      release = NULL;
      sp = NULL;
      cpu = NULL;
      el_string = NULL;
      rpm_spec_vers_cmp = NULL;
      epoch = NULL;
      allowmaj = NULL;
      if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
      if (!empty_or_null(package_array['release'])) release = 'EL' + 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['el_string'])) el_string = package_array['el_string'];
      if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
      if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
      if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
      if (!empty_or_null(package_array['rc_precedence'])) rc_precedence = package_array['rc_precedence'];
      if (reference && release) {
        if (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, rc_precedence:rc_precedence)) flag++;
      }
    }
  }
}

if (!appstreams_found) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module container-tools:2.0');

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, 'buildah / buildah-tests / cockpit-podman / etc');
}