Vulnerabilities > CVE-2013-4957 - Code Injection vulnerability in Puppet Enterprise

047910
CVSS 6.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
puppet
CWE-94
nessus

Summary

The dashboard report in Puppet Enterprise before 3.0.1 allows attackers to execute arbitrary YAML code via a crafted report-specific type.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
  • Manipulating User-Controlled Variables
    This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An attacker can override environment variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the attacker can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.

Nessus

NASL familyCGI abuses
NASL idPUPPET_ENTERPRISE_310.NASL
descriptionAccording to its self-reported version number, the Puppet Enterprise install on the remote host is a version prior to 3.1.0. As a result, it is reportedly affected by multiple vulnerabilities : - An error exists related to the Fiddle and DL modules,
last seen2020-06-01
modified2020-06-02
plugin id70684
published2013-10-29
reporterThis script is Copyright (C) 2013-2018 Tenable Network Security, Inc.
sourcehttps://www.tenable.com/plugins/nessus/70684
titlePuppet Enterprise < 3.1.0 Multiple Vulnerabilities
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(70684);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/12");

  script_cve_id("CVE-2013-2065", "CVE-2013-4287", "CVE-2013-4957", "CVE-2013-4965");
  script_bugtraq_id(59881, 62281, 63173, 63386);

  script_name(english:"Puppet Enterprise < 3.1.0 Multiple Vulnerabilities");
  script_summary(english:"Checks 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
install on the remote host is a version prior to 3.1.0.  As a result,
it is reportedly affected by multiple vulnerabilities :

  - An error exists related to the Fiddle and DL modules,
    '$SAFE' level verification and object handling that
    could allow an attacker to modify system calls.
    (CVE-2013-2065)

  - A remote code execution vulnerability exists that is
    triggered when handling a YAML report. This could allow
    a remote attacker to execute arbitrary code.
    (CVE-2013-4957)

  - A console account brute-force vulnerability exists that
    could allow an attacker to brute-force a known user's
    password. (CVE-2013-4965)

  - A RubyGems algorithmic complexity denial of service
    vulnerability exists that could allow an attacker to
    cause a denial of service through CPU consumption.
    (CVE-2013-4287)"
  );
  script_set_attribute(attribute:"see_also", value:"https://puppet.com/security/cve/cve-2013-2065");
  script_set_attribute(attribute:"see_also", value:"https://puppet.com/security/cve/cve-2013-4957");
  script_set_attribute(attribute:"see_also", value:"https://puppet.com/security/cve/cve-2013-4965");
  script_set_attribute(attribute:"see_also", value:"https://puppet.com/security/cve/cve-2013-4287");
  script_set_attribute(attribute:"solution", value:"Upgrade to Puppet Enterprise 3.1.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:"2013/09/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/10/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/10/29");

  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) 2013-2020 Tenable Network Security, Inc.");

  script_dependencies("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 lowest/earliest vulnerable version, relative to 'fix' (optional)
#
# @return plugin output if 'ver' is vulnerable relative to 'fix' and/or 'min_ver',
#         NULL otherwise
##
function _check_version(enterprise)
{
  local_var ver, fix, min_ver, major_ver, report;
  ver = _FCT_ANON_ARGS[0];
  fix = _FCT_ANON_ARGS[1];
  min_ver = _FCT_ANON_ARGS[2];

  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 ' + fix + '\n';
    }
    else report = NULL;
  }
  else report = NULL;

  return report;
}

port = get_kb_item_or_exit('puppet/rest_port');
ver = get_kb_item_or_exit('puppet/' + port + '/version');
report = NULL;
vuln = FALSE;

if ('Enterprise' >< ver)
{
  # 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, 'Puppet Enterprise', build_url(port:port));
  ver = match[1];

  # Resolved in Puppet Enterprise 3.1.0
  if (
      (report = _check_version(ver, '3.1.0', enterprise:TRUE))
  )
  {
    vuln = TRUE;
  }
}

if (!vuln) audit(AUDIT_LISTEN_NOT_VULN, 'Puppet', port, ver);

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