Vulnerabilities > CVE-2015-7328 - Information Exposure vulnerability in Puppet Enterprise

047910
CVSS 1.9 - LOW
Attack vector
LOCAL
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
NONE
Availability impact
NONE
local
puppet
CWE-200
nessus

Summary

Puppet Server in Puppet Enterprise before 3.8.x before 3.8.3 and 2015.2.x before 2015.2.3 uses world-readable permissions for the private key of the Certification Authority (CA) certificate during the initial installation and configuration, which might allow local users to obtain sensitive information via unspecified vectors.

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Subverting Environment Variable Values
    The attacker directly or indirectly modifies environment variables used by or controlling the target software. The attacker's goal is to cause the target software to deviate from its expected operation in a manner that benefits the attacker.
  • Footprinting
    An attacker engages in probing and exploration activity to identify constituents and properties of the target. Footprinting is a general term to describe a variety of information gathering techniques, often used by attackers in preparation for some attack. It consists of using tools to learn as much as possible about the composition, configuration, and security mechanisms of the targeted application, system or network. Information that might be collected during a footprinting effort could include open ports, applications and their versions, network topology, and similar information. While footprinting is not intended to be damaging (although certain activities, such as network scans, can sometimes cause disruptions to vulnerable applications inadvertently) it may often pave the way for more damaging attacks.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Browser Fingerprinting
    An attacker carefully crafts small snippets of Java Script to efficiently detect the type of browser the potential victim is using. Many web-based attacks need prior knowledge of the web browser including the version of browser to ensure successful exploitation of a vulnerability. Having this knowledge allows an attacker to target the victim with attacks that specifically exploit known or zero day weaknesses in the type and version of the browser used by the victim. Automating this process via Java Script as a part of the same delivery system used to exploit the browser is considered more efficient as the attacker can supply a browser fingerprinting method and integrate it with exploit code, all contained in Java Script and in response to the same web page request by the browser.
  • Session Credential Falsification through Prediction
    This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.

Nessus

NASL familyCGI abuses
NASL idPUPPET_ENTERPRISE_383.NASL
descriptionAccording to its self-reported version number, the Puppet Enterprise application installed on the remote host is version 3.8.x prior to 3.8.3 or 4.2.x prior to 4.2.3. It is, therefore, affected by an information disclosure vulnerability due to the generated CA key being left in a world-readable state during initial installation and configuration. A local attacker can exploit this to gain access to CA key information.
last seen2020-06-01
modified2020-06-02
plugin id87472
published2015-12-17
reporterThis script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/87472
titlePuppet Enterprise Installation Process Local CA Key Disclosure
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(87472);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/12");

  script_cve_id("CVE-2015-7328");

  script_name(english:"Puppet Enterprise Installation Process Local CA Key Disclosure");
  script_summary(english:"Checks the Puppet Enterprise version.");

  script_set_attribute(attribute:"synopsis", value:
"A web application on the remote host is affected by an information
disclosure vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the Puppet Enterprise
application installed on the remote host is version 3.8.x prior to
3.8.3 or 4.2.x prior to 4.2.3. It is, therefore, affected by an
information disclosure vulnerability due to the generated CA key being
left in a world-readable state during initial installation and
configuration. A local attacker can exploit this to gain access to
CA key information.");
  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/cve-2015-7328");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Puppet Enterprise version 3.8.3 / 4.2.3 or later. Note that
version 4.2.3 is also known as Puppet Enterprise 2015.2.3");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/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:L/AC:H/PR:L/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-2015-7328");

  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:"2015/11/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/17");

  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) 2015-2020 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");

  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 3.8.3 or 2015.2.3'
        + '\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 =~ "^3\.8\.")
  {
    report = _check_version(
        ver:ver,
        fix:'3.8.3',
        min_ver:'3.8.0',
        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";
  if (ver =~ "^4\.2\.")
  {
    report = _check_version(
        ver:ver,
        fix:'4.2.3',
        min_ver:'4.2.0',
        enterprise:TRUE
    );
    if (!isnull(report)) vuln = TRUE;
  }
}
# 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_note(port:port, extra:report);
else security_note(port);