Document Title:
===============
Perch v3.0.3 CMS - Multiple Web Vulnerabilities
References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2067
Release Date:
=============
2017-05-29
Vulnerability Laboratory ID (VL-ID):
====================================
2067
Common Vulnerability Scoring System:
====================================
3.8
Vulnerability Class:
====================
Arbitrary File Upload
Product & Service Introduction:
===============================
Perch is a content management system designed for small websites as a drop-in solution. Perch Runway a fully featured CMS for larger content driven sites.
They share a template language and many features - the main difference is the types of projects they are each designed for.
(Copy of the Homepage: https://docs.grabaperch.com )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory discovered an unrestricted file upload & stored cross site scripting web vulnerabilities in the Perch v3.0.3 Content Management System.
Vulnerability Disclosure Timeline:
==================================
2017-05-29: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Edgeofmyseat
Product: Perch - Content Management System (Web-Application) 3.0.3
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
An unrestricted file upload & stored cross site scripting vulnerabilities has been discovered in the official Perch v3.0.3 content management system.
The security vulnerability is located in the `Asset Title` input field & `Select File` upload file of the vulnerable `Adding a New Asset` module POST method request.
The `Asset Title` validation input field allows to execute any injected payload string code that is stored in the database management system. The `Select File` field
is not parsed and allows a limited admin to upload unrestricted files to the web-server system.
The security risk of the stored cross site scripting & unrestricted file upload vulnerability is estimated as medium (CVSS 3.8). Exploitation of the (non-persistent & persistent)
input validation web vulnerability requires a privileged web-application user account and medium user interaction. Successful exploitation of the vulnerability results
in session hijacking, non-persistent and persistent phishing attacks, non-persistent and persistent external redirects to malicious source, non-persistent and persistent
manipulation of affected or connected application modules.
Proof of Concept (PoC):
=======================
The unrestricted file upload & stored cross site scripting web vulnerabilities can be exploited by remote attackers with privileged user account and with Medium user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.
Manual steps to reproduce the vulnerability ...
1. Install Perch CMS
Note: Your Account is a "Primary Admin"
2. Login to the web-application
3. Add " Limited Admin " with Admin Role
4. Add " UserLab " with Editor Role
Log Out Your "Primary Admin" Account and Log in with "Limited Admin" Account
5. Go To ..assets/
6. Add asset button
7. Create a MALICIOUS SCRIPT CODE EXECUTION Title
8. Upload any Malware or malicious file
9. Click on Submit button
10. Open The "UserLab & Primary Admin " Accounts
11. Go To Listing Assets
12. The execution of the vulnerability by an limited admin are Stored and published in all Users "Listing assets" module
13. Successful reproduce of the vulnerability!
PoC: Attack Scheme :
https://www.youtube.com/watch?v=klYQ6iXfjUI&feature=youtu.be
PoC: LimitedAdmin - Asset Title => (http://Perch-cms.localhost:8080/perch/core/apps/assets/edit/?id=)
Security Risk:
==============
The security risk of the persistent cross site and unrestricted file upload web vulnerabilities in the Perch CMS is estimated as medium (CVSS 3.8).
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - SaifAllah benMassaoud (https://twitter.com/benmassaou) - (http://www.vulnerability-lab.com/show.php?user=SaifAllahbenMassaoud )
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=========================
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