[FD] Apache Sling Framework v2.3.6 (Adobe AEM) [CVE-2016-0956] - Information Disclosure Vulnerability

[Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>]

Document Title:
===============
Apache Sling Framework v2.3.6 (Adobe AEM) [CVE-2016-0956] - Information 
Disclosure Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1536

Adobe Bulletin: 
https://helpx.adobe.com/security/products/experience-manager/apsb16-05.html

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-0956

Vulnerability Magazine: 
http://magazine.vulnerability-db.com/?q=articles/2016/02/10/apache-sling-fw-v236-remote-slingpostservlet-exception-vulnerability


CVE-ID:
=======
CVE-2016-0956


Release Date:
=============
2016-02-10


Vulnerability Laboratory ID (VL-ID):
====================================
1536


Common Vulnerability Scoring System:
====================================
6.4


Product & Service Introduction:
===============================
Apache Sling is a web framework that uses a Java Content Repository, such as 
Apache Jackrabbit, to store and manage content. Sling applications use either 
scripts 
or Java servlets, selected based on simple name conventions, to process HTTP 
requests in a RESTful way. The embedded Apache Felix OSGi framework and console 
provide 
a dynamic runtime environment, where code and content bundles can be loaded, 
unloaded and reconfigured at runtime. As the first web framework dedicated to 
JSR-170 
Java Content Repositories, Sling makes it very simple to implement simple 
applications, while providing an enterprise-level framework for more complex 
applications.

(Copy of the Vendor Homepage:  http://sling.apache.org/)


Adobe Experience Manager (AEM) provides a complete suite of applications for 
the Web Experience Management (WEM) of organizations.

(Copy of the Vendor Homepage: https://docs.adobe.com/docs/en/aem/6-1.html )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered a remote 
vulnerability in the official Apache Sling Framwork v2.3.6 software.


Vulnerability Disclosure Timeline:
==================================
2016-02-10:     Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
Apache Software Foundation
Product: Apache Sling - Framework (Adobe AEM) 2.3.6


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


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


Technical Details & Description:
================================
It seems that on some instances of AEM, due to lack of proper security controls 
and or misconfiguration, it is possible for remote unauthenticated 
users to enumerate local system files/folders that arent accessible publicly to 
unauthenticated users.

This can be achieved by sending a `delete` requests to the SlingPostServlet 
which in return, responds back with a 500 exception page and the 
following exception message: 
(org.apache.sling.api.resource.PersistenceException - Unable to commit changes 
to session)

No actual files are deleted with this request however, the HTML response 
contains a `ChangeLog` field which is where all enumerated folder/file 
names are displayed (if existing). For instance, following POC command can be 
used to reproduce the said behavior.

curl -F``:operation=delete`` -F``:applyTo=/foldername/*`` 
http://website.com/path/file.html

To reproduce this in real world, I found an adobe website which is currently 
affected with this behavior. You can use the following CURL command 
to reproduce the POC:

curl -F``:operation=delete`` -F``:applyTo=/etc/*`` 
https://www.adobedemo.com/content/adobedemolab/welcome-page.html

Note: This curl command should enumerate all files/folders which currently 
exist in /etc folder

This vulnerability currently affects major websites i.e. almost every instance 
of Adobe AEM published on the internet. Some references are included below for 
reference.

Affected Framework(s):
Apache Sling

Affected Product(s)
Adobe AEM (All Versions)


Proof of Concept (PoC):
=======================
The security vulnerability can be exploited by remote attackers without 
privilege system user account or user interaction.
For security demonstration or to reproduce the vulnerability follow the 
provided information and steps below to continue.

PoC:
1. curl -F":operation=delete" -F":applyTo=/foldername/*" 
http://website.com/path/file.html
2. curl -F":operation=delete" -F":applyTo=/etc/*" 
https://www.adobedemo.com/content/adobedemolab/welcome-page.html


Solution - Fix & Patch:
=======================
The vulnerability is fixed in version Servlets POST 2.3.8. Please update by by 
automatic request or implement the manual fix.

Adobe: Hot fix 6445 resolves an information disclosure vulnerability affecting 
Apache Sling Servlets Post 2.3.6 (CVE-2016-0956).


Security Risk:
==============
The security risk of the exception software vulnerability in the apache sling 
framework is estimated as high. (CVSS 6.4)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Ateeq Khan (ateeq@xxxxxxxxxxxxxxxxx) 
[www.vulnerability-lab.com] (https://twitter.com/cybercrimenews)


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=========================
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