Message-ID: <1beccdbe-a9ca-c489-e2cf-1abbf51cdf81@vulnerability-lab.com>
Date: Wed, 18 Jul 2018 16:28:03 +0200
From: Vulnerability Lab <research@...nerability-lab.com>
To: fulldisclosure@...lists.org
Subject: [FD] GhostMail - (Status Message) Persistent Web Vulnerability

Document Title:
===============
GhostMail - (Status Message) Persistent Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1470


Release Date:
=============
2018-06-27


Vulnerability Laboratory ID (VL-ID):
====================================
1470


Common Vulnerability Scoring System:
====================================
4


Vulnerability Class:
====================
Script Code Injection


Current Estimated Price:
========================
1.000€ - 2.000€


Product & Service Introduction:
===============================
Sign up to military grade encrypted GhostMail and enjoy instant free and
secure email & chat. No download or installs needed.
GhostMail is your new secure email & chat platform, with great features
like self destruction, two factor login and much more...
Join free today and start enforcing your privacy and online rights.

(Copy of the Vendor Homepage: https://www.ghostmail.com/ )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered an
application-side vulnerability in the official GhostMail chat online
service web-application.


Vulnerability Disclosure Timeline:
==================================
2018-06-27: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
GhostCom Ltd.
Product: GhostMail (Chat) - Web Application (Online Service) 2015 Q2


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


Severity Level:
===============
Medium


Authentication Type:
====================
Restricted authentication (user/moderator) - User privileges


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Bug Bounty Program


Technical Details & Description:
================================
An application-side html injection web vulnerability has been discovered
in the official GhostMail chat web-application.
The vulnerability allows to inject unauthorized malicious script codes
on the application-side of the affected module.

The issue exists in chat status of the application and is remotly
exploitable against other ghostmail user accounts.
The request method to inject is POST and the attack vector is located on
the application-side of the affected online
service web-application. The encoding of the status message in the chat
client is broken. Local and remote attackers
can use the lack of validation to perform html injection attacks to
compromise user/moderator/admin session data.

The security risk of the html injection web vulnerability is estimated
as medium with a cvss count of 4.0.
Exploitation of the issue requires a low privileged web-application user
account and no direct user interaction.
Successful exploitation of the application-side vulnerability results in
session hijacking, persistent phishing,
persistent external redirects and persistent manipulation affected or
connected module context.

Vulnerable Domain(s):
[+] Ghostmail.com

Vulnerable Module(s):
[+] Status Message

Vulnerable Parameter(s):
[+] Status message body context


Proof of Concept (PoC):
=======================
The html injection web vulnerability can be exploited by local and
remote attackers with low user interaction and low privileged
application user account.
For security demonstration or to reproduce the security vulnerability
follow the provided information and steps below to continue.

Manual Steps to reproduce the vulnerability ...
1. Register an account and login to the ghostmail application
2. Move to the chat status contents
3. Close the tag of title with double quote "
4. Now, add a new malicious content as payload in the status title  for
the chat
5. Start to chat and in the same moment the execution of the script code
occurs at both party sides of the client
6. Successful reproduce of the vulnerability!

Note: There is no filter validation or mechanism in place to prevent an
execution within the ghostmail web-application.

Reference(s):
https://www.ghostmail.com/


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a parse and encode of the vulnerable
status mesage in the ghostmail chat client.
The issue has been reported in 2016 Q4 (2016-10-01) and was finally
resolved in 2017 Q3 - Q4 by the ghostmail developer team.


Security Risk:
==============
The security risk of the application-side input validation web
vulnerability in the chat module is estimated as medium (CVSS 4.0).


Credits & Authors:
==================
Vulnerability-Lab [research@...nerability-lab.com] -
https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab


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