Puppet Enterprise 2016.x < 2016.4.12 / 2017.x < 2017.3.7 / 2018.x < 2018.1.1 Arbitrary Code Execution Vulnerability

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(129760);
  script_version("1.2");
  script_cvs_date("Date: 2019/10/17 14:31:04");

  script_cve_id("CVE-2018-6513");

  script_name(english:"Puppet Enterprise 2016.x < 2016.4.12 / 2017.x < 2017.3.7 / 2018.x < 2018.1.1 Arbitrary Code Execution Vulnerability");
  script_summary(english:"Checks the Puppet Enterprise version.");

  script_set_attribute(attribute:"synopsis", value:
"A web application running on the remote host is affected by a code 
execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"A remote code execution vulnerability exists in Windows Agents due to a privilege escalation vulnerability associated with 
 shared libraries from untrusted paths. An authenticated, 
 unpriviledged local attacker can write custom facts which 
 escalate privileges on the next puppet run. (CVE-2018-6513)");
  script_set_attribute(attribute:"see_also", value:"https://puppet.com/security/cve/CVE-2018-6513");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Puppet Enterprise version 2016.4.12 / 2017.3.7 / 2018.1.1 or later.");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-6513");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/06/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/06/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/10/09");

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

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

  script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include('vcf.inc');
include('http.inc');

app = 'Puppet REST API'; # we get both enterprise and open-source versions from the api...

# Make sure we detected a version 
port = get_kb_item_or_exit('puppet/rest_port');
ver = get_kb_item_or_exit('puppet/' + port + '/version');

# Make sure the Console service is running
get_kb_item_or_exit('installed_sw/puppet_enterprise_console');

app_info = vcf::get_app_info(app:app, port:port, webapp:TRUE, kb_ver: 'puppet/' + port + '/version');

# version info obtained from https://puppet.com/docs/pe/2018.1/component_versions_in_recent_pe_releases.html
constraints = [
  {"min_version" : "4.0.0", "fixed_version" : "4.10.12", "fixed_display" : "Puppet Enterprise (2016.4.5)"}, # 2016.4.5
  {"min_version" : "5.3.0", "fixed_version" : "5.3.7" , "fixed_display" : "Puppet Enterprise (2017.3.7)"},  # 2017.3.7
  {"min_version" : "5.5.0", "fixed_version" : "5.5.6" , "fixed_display" : "Puppet Enterprise (2018.1.1)" } # 2018.1.1
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);