Adobe CreativeCloud (Webform) - Persistent Vulnerability

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


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1848




Release Date:
=============
2018-01-04


Vulnerability Laboratory ID (VL-ID):
====================================
1848


Common Vulnerability Scoring System:
====================================
3.7


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 Webinar Form online service web-application.


Vulnerability Disclosure Timeline:
==================================
2018-01-04: 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


Technical Details & Description:
================================
An application-side input validation and encoding vulnerability has been discovered in the official Adobe CreativeCloud Webinar Form 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 webinar 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 3.7. 
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):
[+] Webinar - 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 validation and mail encode vulnerability can be exploited by remote attackers without 
privileged web-application user account and with low or 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. Open the vulnerable website of the references
2. Surf to the registration formular on the webpage
3. Inject a payload to the firstname and lastname input fields
4. Include a valid target email address and send the add registration POST method request
5. Open the inbox and review the email body context
Note: Once the emails arrives the code is already wrong encoded. The execute of the payload occurs in the body context
6. Successful reproduce of the application-side mail encode vulnerability!


PoC: Registration Confirmation - Adobe Portfolio Reviews at OFFF
<p class="p1">Dear "&gt;<[PERSISTENT INJECTED SCRIPT CODE EXECUTION!]">a,</p><p class="p1"></p><p class="p1">Thank you for registering! We will contact with you very soon if you are selected for an Adobe Porfolio Review session during OFFF with details on day, time and selected artist to review your Adobe Portfolio.</p><p class="p1"></p><p class="p1">For online reviews, we will be doing the portfolio reviews via our <a href="http://bean.attendease.com/track/click/12604751/www.twitch.tv?p=eyJzIjoiMkhLMjBDWmFxVmo4T19USzBBRzBDQjROc3NRIiwidiI6MSwicCI6IntcInVcIjoxMjYwNDc1MSxcInZcIjoxLFwidXJsXCI6XCJodHRwczpcXFwvXFxcL3d3dy50d2l0Y2gudHZcXFwvYWRvYmVcIixcImlkXCI6XCI3Yjg1ZGJjYWFmYTQ0YzI1YjRlNjlkZTU0NzE0OTU5OVwiLFwidXJsX2lkc1wiOltcImU0ZDBlZGFmMDllYzEyNzNhZGEyYzIxNjAzNjhlZjllZjBkZWYxZDVcIl19In0" target="_blank">Adobe Twitch Channel</a>, so please make sure you connect at the specified time to interact with the artist via chat.</p><p class="p1"></p><p class="p1">For live reviews, you will have to come to the Adobe Lounge at least 10mins prior to your Portfolio Review. </p><p class="p1"></p><p class="p1">Here are some tips to get you started and polish your Adobe Portfolio before the Big Day at OFFF:</p><p class="p1"><a href="http://bean.attendease.com/track/click/12604751/www.myportfolio.com?p=eyJzIjoiVFp5aEJ3TG9OMmYyUWUyMTRySGs5VWMzYWpjIiwidiI6MSwicCI6IntcInVcIjoxMjYwNDc1MSxcInZcIjoxLFwidXJsXCI6XCJodHRwczpcXFwvXFxcL3d3dy5teXBvcnRmb2xpby5jb21cXFwvXCIsXCJpZFwiOlwiN2I4NWRiY2FhZmE0NGMyNWI0ZTY5ZGU1NDcxNDk1OTlcIixcInVybF9pZHNcIjpbXCI3N2Y3MzQ5MTFkNTg2NTI3OTdhOWZjOGM1ZmQ0N2I1NmZiYzE2MGMxXCJdfSJ9" target="_blank">https://www.myportfolio.com/</a></p><p class="p1"></p>< p class="p1">Thank you,</p><p class="p1">


Status: 302[Found]
POST https://offfreviews.creativecloud.adobeevents.com/register 
Load Flags[LOAD_DOCUMENT_URI  LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[131] Mime Type[text/html]
   Request Header:
      Host[offfreviews.creativecloud.adobeevents.com]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0]
      Referer[https://offfreviews.creativecloud.adobeevents.com/register]
      Cookie[_attendease_deuce_session=db9e531d845fce2b99476295d15a4ad4; AMCV_9E1005A551ED61CA0A490D45%40AdobeOrg=793872103%7CMCIDTS%7C16941%7CMCMID%7C78710532507483722478170780068460549381%7CMCAID%7C2B9EF0B285316284-600001144044596E; s_pers=%20TID%3DSYBNM49Q--%7C1474041212377%3B%20gpv%3Dofffreviews.creativecloud.adobeevents.com%253Aregister%7C1463675359543%3B%20s_nr%3D1463673559546-New%7C1495209559546%3B%20s_vs%3D1%7C1463675388296%3B; s_sess=%20s_a_campaign%3DSYBNM49Q%3B%20s_cpc%3D0%3B%20s_ppv%3D%255B%2522offfreviews.creativecloud.adobeevents.com%252Fregister%2522%252C100%252C0%252C2453%252C1366%252C541%252C1366%252C768%252C1%252C%2522P%2522%255D%3B%20s_cc%3Dtrue%3B%20s_sq%3Dadbadobenonacdcprod%253D%252526pid%25253Dofffreviews.creativecloud.adobeevents.com%2525253Aregister%252526pidt%25253D1%252526oid%25253DRegister%252526oidt%25253D3%252526ot%25253DSUBMIT%2526adbdtmstatsprod%253D%252526pid%25253Dofffreviews.creativecloud.adobeevents.com%2525257Cregister%252526pidt%25253D1%252526oid%25253DRegister%252526oidt%25253D3%252526ot%25253DSUBMIT%3B; mbox=session#1463673189165-268684#1463675420|em-disabled#true#1463674995]
      Connection[keep-alive]
   POST-Daten:
      attendee%5Bregistration_form_filings%5D%5B%5D%5Bform_id%5D[572854874be5dd6de000288b]
      attendee%5Bfirst_name%5D[%22%3E%3C[PERSISTENT SCRIPT CODE INJECT!]%3Da%3Ea]
      attendee%5Blast_name%5D[b%22%3E%3C[PERSISTENT SCRIPT CODE INJECT!]%3Da%3E]
      attendee%5Bemail%5D[bkm%40evolution-sec.com]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B572854874be5dd6de0002892%5D[%22%3E%3Ctest%3Da%3E]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B5732e0894be5ddbd5100415c_country%5D[DE]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B5732e0894be5ddbd5100415c_region%5D[Hessen]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B572854874be5dd6de00029b0%5D[34131]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B5728b17e4be5dd6de0009873%5D[5728b37d4be5dd6de0009b18]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B5729c65b4be5dd4f7b000a55%5D[%22%3E%3Ctest%3Da%3E++%22%3E%3Ca%3E%2520%2520%3%3E]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B5728b4784be5dd6de0009cd5%5D[243242652226]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B5729c7554be5dd8799005436%5D%5B%5D[5729c7554be5dd879900543d]
      attendee%5Bregistration_form_filings%5D%5B%5D%5Banswers%5D%5B572854874be5dd6de00028c2%5D%5B%5D[572854874be5dd6de00028c3]
   Response Header:
      Access-Control-Allow-Origin[*]
      Access-Control-Request-Method[*]
      Cache-Control[no-cache]
      Content-Type[text/html; charset=utf-8]
      Date[Thu, 19 May 2016 15:59:48 GMT]
      Location[https://offfreviews.creativecloud.adobeevents.com/register/thanks]
      Server[nginx/1.8.0]
      Status[302 Found]


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


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable firstname, lastname and companyname input fields.
Disallow the usage of special char and restrict the context to prevent application-side script code injection attacks.
Encode the name value in the output location of the email system to patch the issue.

Note: The issue was resolved in 2017 Q1-4 by the adobe security team.


Security Risk:
==============
The security risk of the application-side validation and mail encode vulnerability in the adobe webformular is estimated as medium (CVSS 3.7).


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


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