Puppet Enterprise Multiple OpenSSL Vulnerabilities (FREAK)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

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

if (description)
{
  script_id(87672);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");

  script_cve_id(
    "CVE-2015-0204",
    "CVE-2015-0209",
    "CVE-2015-0286",
    "CVE-2015-0287",
    "CVE-2015-0288",
    "CVE-2015-0289",
    "CVE-2015-0292",
    "CVE-2015-0293"
  );
  script_bugtraq_id(
    71936,
    73225,
    73227,
    73228,
    73231,
    73232,
    73237,
    73239
  );
  script_xref(name:"CERT", value:"243585");

  script_name(english:"Puppet Enterprise Multiple OpenSSL Vulnerabilities (FREAK)");
  script_summary(english:"Checks the Puppet Enterprise version.");

  script_set_attribute(attribute:"synopsis", value:
"A web application on the remote host is affected by multiple
vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the Puppet Enterprise
application installed on the remote host is version 2.x or 3.x prior
to 3.8.0. It is, therefore, affected by the following
vulnerabilities :

  - A security feature bypass vulnerability, known as FREAK
    (Factoring attack on RSA-EXPORT Keys), exists due to the
    support of weak EXPORT_RSA cipher suites with keys less
    than or equal to 512 bits. A man-in-the-middle attacker
    may be able to downgrade the SSL/TLS connection to use
    EXPORT_RSA cipher suites which can be factored in a
    short amount of time, allowing the attacker to intercept
    and decrypt the traffic. (CVE-2015-0204)

  - A use-after-free condition exists in the
    d2i_ECPrivateKey() function due to improper processing
    of malformed EC private key files during import. A
    remote attacker can exploit this to dereference or free
    already freed memory, resulting in a denial of service
    or other unspecified impact. (CVE-2015-0209)

  - An invalid read error exists in the ASN1_TYPE_cmp()
    function due to improperly performed boolean-type
    comparisons. A remote attacker can exploit this, via a
    crafted X.509 certificate to an endpoint that uses the
    certificate-verification feature, to cause an invalid
    read operation, resulting in a denial of service.
    (CVE-2015-0286)

  - A flaw exists in the ASN1_item_ex_d2i() function due to
    a failure to reinitialize 'CHOICE' and 'ADB' data
    structures when reusing a structure in ASN.1 parsing.
    This allows a remote attacker to cause an invalid write
    operation and memory corruption, resulting in a denial
    of service. (CVE-2015-0287)

  - A NULL pointer dereference flaw exists in the
    X509_to_X509_REQ() function due to improper processing
    of certificate keys. This allows a remote attacker, via
    a crafted X.509 certificate, to cause a denial of
    service. (CVE-2015-0288)

  - A NULL pointer dereference flaw exists in the PKCS#7
    parsing code due to incorrect handling of missing outer
    ContentInfo. This allows a remote attacker, using an
    application that processes arbitrary PKCS#7 data and
    providing malformed data with ASN.1 encoding, to cause
    a denial of service. (CVE-2015-0289)

  - An integer underflow condition exists in the
    EVP_DecodeUpdate() function due to improper validation
    of base64 encoded input when decoding. This allows a
    remote attacker, using maliciously crafted base64 data,
    to cause a segmentation fault or memory corruption,
    resulting in a denial of service or possibly the
    execution of arbitrary code. (CVE-2015-0292)

  - A flaw exists in servers that both support SSLv2 and
    enable export cipher suites due to improper
    implementation of SSLv2. A remote attacker can exploit
    this, via a crafted CLIENT-MASTER-KEY message, to cause
    a denial of service. (CVE-2015-0293)");
  script_set_attribute(attribute:"see_also", value:"https://puppet.com/docs/puppet/6.0/release_notes.html");
  script_set_attribute(attribute:"see_also", value:"https://puppet.com/security/cve/openssl-march-2015-vulnerability-fix");
  script_set_attribute(attribute:"see_also", value:"https://www.openssl.org/news/secadv/20150319.txt");
  script_set_attribute(attribute:"see_also", value:"https://www.smacktls.com/#freak");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Puppet Enterprise version 3.8.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/01/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/04/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/30");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:puppetlabs:puppet");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2015-2021 Tenable Network Security, Inc.");

  script_dependencies(
      "puppet_enterprise_console_detect.nasl",
      "puppet_rest_detect.nasl"
  );
  script_require_keys("puppet/rest_port");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");


##
# checks if the given version falls between the given bounds, and
# generates plugin output if it does
#
# @anonparam ver version to check
# @anonparam fix first fixed version
# @anonparam min_ver the earliest vulnerable version (optional)
#
# @return plugin output if 'ver' is vulnerable relative to 'fix' and/or 'min_ver',
#         NULL otherwise
##
function _check_version(ver, fix, min_ver, enterprise)
{
  local_var report = NULL;

  if (
    # no lower bound
    (isnull(min_ver) && ver_compare(ver:ver, fix:fix, strict:FALSE) < 0) ||

    # lower bound
    (
      !isnull(min_ver) &&
      ver_compare(ver:ver, fix:fix, strict:FALSE) < 0 &&
      ver_compare(ver:ver, fix:min_ver, strict:FALSE) >= 0
    )
  )
  {
    if (enterprise)
    {
      report =
        '\n  Installed version : Puppet Enterprise ' + ver +
        '\n  Fixed version     : Puppet Enterprise 3.8.0'
        + '\n';
    }
  }

  return report;
}

port = get_kb_item_or_exit('puppet/rest_port');
ver = get_kb_item_or_exit('puppet/' + port + '/version');
report = NULL;
vuln = FALSE;
product = ""; # Enterprise or Open Source

# Enterprise versions <= 3.8.3 have a unique HTTP header text
# E.g. X-Puppet-Version: 3.8.4 (Puppet Enterprise 3.8.3)
if ('Enterprise' >< ver)
{
  product = "Puppet Enterprise";
  # convert something like
  #   2.7.19 (Puppet Enterprise 2.7.0)
  # to
  #   2.7.0
  match = eregmatch(string:ver, pattern:"Enterprise ([0-9.]+)\)");
  if (isnull(match))
    audit(AUDIT_UNKNOWN_WEB_APP_VER, product, build_url(port:port));
  ver = match[1];

  if (ver =~ "^[23]\.")
  {
    report = _check_version(
        ver:ver,
        fix:'3.8.0',
        min_ver:'2.0.0',
        enterprise:TRUE
    );
    if (!isnull(report)) vuln = TRUE;
  }
}
# The newer enterprise versions do not have the 'Enterprise'
# text in the HTTP header, so we need to check if the Puppet
# Enterprise Console was detected. Puppet Open Source does not come
# with a web console user interface out of the box.
else if (get_kb_item('installed_sw/puppet_enterprise_console'))
{
  product = "Puppet Enterprise";
  vuln = FALSE;
}
# otherwise, it's the open source edition
else
{
  product = "Puppet Open Source";
  vuln = FALSE;
}

if (!vuln) audit(AUDIT_LISTEN_NOT_VULN, product, port, ver);

if (report_verbosity > 0) security_hole(port:port, extra:report);
else security_hole(port);