Oracle Linux 7 : cups (ELSA-2020-3864)

##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2020-3864.
##

include('compat.inc');

if (description)
{
  script_id(141234);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/16");

  script_cve_id("CVE-2017-18190", "CVE-2019-8675", "CVE-2019-8696");

  script_name(english:"Oracle Linux 7 : cups (ELSA-2020-3864)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ELSA-2020-3864 advisory.

  - A localhost.localdomain whitelist entry in valid_host() in scheduler/client.c in CUPS before 2.2.2 allows
    remote attackers to execute arbitrary IPP commands by sending POST requests to the CUPS daemon in
    conjunction with DNS rebinding. The localhost.localdomain name is often resolved via a DNS server (neither
    the OS nor the web browser is responsible for ensuring that localhost.localdomain is 127.0.0.1).
    (CVE-2017-18190)

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://linux.oracle.com/errata/ELSA-2020-3864.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  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:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-8696");

  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:"2018/02/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/10/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/10/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:cups");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:cups-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:cups-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:cups-filesystem");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:cups-ipptool");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:cups-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:cups-lpd");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020-2024 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:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 7', '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);

pkgs = [
    {'reference':'cups-1.6.3-51.el7', 'cpu':'aarch64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-1.6.3-51.el7', 'cpu':'x86_64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-client-1.6.3-51.el7', 'cpu':'aarch64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-client-1.6.3-51.el7', 'cpu':'x86_64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-devel-1.6.3-51.el7', 'cpu':'aarch64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-devel-1.6.3-51.el7', 'cpu':'i686', 'release':'7', 'epoch':'1'},
    {'reference':'cups-devel-1.6.3-51.el7', 'cpu':'x86_64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-filesystem-1.6.3-51.el7', 'release':'7', 'epoch':'1'},
    {'reference':'cups-ipptool-1.6.3-51.el7', 'cpu':'aarch64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-ipptool-1.6.3-51.el7', 'cpu':'x86_64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-libs-1.6.3-51.el7', 'cpu':'aarch64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-libs-1.6.3-51.el7', 'cpu':'i686', 'release':'7', 'epoch':'1'},
    {'reference':'cups-libs-1.6.3-51.el7', 'cpu':'x86_64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-lpd-1.6.3-51.el7', 'cpu':'aarch64', 'release':'7', 'epoch':'1'},
    {'reference':'cups-lpd-1.6.3-51.el7', 'cpu':'x86_64', 'release':'7', 'epoch':'1'}
];

flag = 0;
foreach package_array ( pkgs ) {
  reference = NULL;
  release = NULL;
  sp = NULL;
  cpu = NULL;
  el_string = NULL;
  rpm_spec_vers_cmp = NULL;
  epoch = NULL;
  allowmaj = NULL;
  rpm_prefix = 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['rpm_prefix'])) rpm_prefix = package_array['rpm_prefix'];
  if (reference && release) {
    if (rpm_prefix) {
        if (rpm_exists(release:release, rpm:rpm_prefix) && 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)) flag++;
    } else {
        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)) 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, 'cups / cups-client / cups-devel / etc');
}