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JGI CMS 1.0 Script Source Code Disclosure

JGI CMS 1.0 Script Source Code Disclosure
Posted Sep 11, 2017
Authored by Renzi

JGI CMS version 1.0 suffers from a source disclosure vulnerability.

tags | exploit, info disclosure
SHA-256 | 0ddd52baa4503d9763353b53c27a8e22030354096858ea0f767223cf9254153c

JGI CMS 1.0 Script Source Code Disclosure

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Title:
=======
JGI CMS - Script Source Code Disclosure

Introduction:
==============
A content management system (CMS) is a computer application that supports the creation and modification of digital content.
It is often used to support multiple users working in a collaborative environment.
CMS features vary widely. Most CMSs include Web-based publishing, format management, history editing and version control, indexing, search, and retrieval.
By their nature, content management systems support the separation of content and presentation.

Vulnerability Disclosure:
==========================
2017-09-10: Public Disclosure

Affected Product(s):
=====================
JGI CMS 1.0

Exploitation Technique:
========================
Remote

Severity Level:
================
High

Technical Details & Description:
=================================
A Source Code Disclosure vulnerability has been discovered in the JCI CMS web-application.
The vulnerability is located in the 'arquivo' parameter of the`dl.php` action GET method request.

Request Method(s):

[+] GET

Vulnerable Function(s):

[+] dl.php

Vulnerable Parameter(s):

[+] arquivo

Proof of Concept (PoC):
========================
It is possible to read the source code of this script by using script filename as a parameter.
It seems that this script includes a file which name is determined using user-supplied data.
This data is not properly validated before being passed to the include function.

[+] http://www.abq.org.br/dl.php?arquivo=dl.php

Solution
=========
For starters, programmers should be trained to validate user input from browsers.
Input validation ensures that attackers cannot use commands that leave the root directory or violate other access privileges.
Beyond this, filters can be used to block certain user input.
Enterprises typically employ filters to block URLs containing commands and escape codes that are commonly used by attackers.
Additionally, web server software (and any software that is used) should be kept up-to-date with current patches.
Regularly patching software is a critical practice for reducing security risk, as software patches typically contain security fixes.

Credits
========
Felipe "Renzi" Gabriel

Contact
========
renzi@linuxmail.org

References
==========
https://www.acunetix.com/vulnerabilities/web/script-source-code-disclosure
https://www.veracode.com/security/directory-traversal
https://en.wikipedia.org/wiki/Content_management_system
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