Adobe Animate 15.2.1.95 Buffer Overflow

`[+] Credits: John Page aka hyp3rlinx  
  
[+] Website: hyp3rlinx.altervista.org  
  
[+] Source:  
http://hyp3rlinx.altervista.org/advisories/ADOBE-ANIMATE-MEMORY-CORRUPTION-VULNERABILITY.txt  
  
[+] ISR: ApparitionSec  
  
  
  
Vendor:  
=============  
www.adobe.com  
  
  
  
Product(s):  
=============================  
Adobe Animate  
15.2.1.95 and earlier versions  
  
Adobe Animate (formerly Adobe Flash Professional, Macromedia Flash, and  
FutureSplash Animator) is a multimedia authoring and computer  
animation program developed by Adobe Systems.  
  
  
  
Platforms:  
===================  
Windows / Macintosh  
  
  
  
Vulnerability Type:  
=======================================  
Critical Memory Corruption Vulnerability  
  
  
  
CVE Reference:  
==============  
CVE-2016-7866  
APSB16-38  
  
  
  
Vulnerability Details:  
=====================  
Adobe Animate suffers from a Buffer Overflow when creating .FLA files with  
ActionScript Classes that use overly long Class names.  
This causes memory corruption leading to possible arbitrary code execution  
upon opening a maliciously created .Fla Flash file.  
  
  
Reproduction / POC:  
  
  
1) Create FLA with overly long Class name in FLA Class publish properties  
input field.  
2) Save and close  
3) Reopen FLA, click edit to open the .as script file  
4) "ctrl + s" to save then boom.... access violation  
  
  
Distributed:  
Create new ".as" ActionScript 3 (AS3) file and give it very long class name  
in input field then hit "Ctrl+s" to save..  
you will crash IDE, next way described is ONE way how attackers can  
distribute malicious .FLA  
  
Abusing JSFL, The Flash JavaScript application programming interface  
(JavaScript API or JSAPI).  
  
1) Create following .JSFL file  
  
fl.getDocumentDOM().save();  
fl.getDocumentDOM().testMovie();  
  
2) Create a MovieClip stored in FLA library with a very long class name  
that extends MovieClip and export  
it for ActionScript etc...  
  
  
3) Drag the MovieClip to the stage  
  
  
4) Bundle FLA/JSFL file, make avail for download as example on how to use  
JSFL to call save() / publish() functions.  
  
  
User opens .FLA, runs harmless looking JSFL code then BOOM!  
  
  
  
Reference:  
https://helpx.adobe.com/security/products/animate/apsb16-38.html  
  
  
  
  
Disclosure Timeline:  
=====================================  
Vendor Notification: May 28, 2016  
December 13, 2016 : Public Disclosure  
  
  
  
  
Exploitation Technique:  
=======================  
Local  
  
  
  
  
Severity Level:  
================  
High  
  
  
  
[+] Disclaimer  
The information contained within this advisory is supplied "as-is" with no  
warranties or guarantees of fitness of use or otherwise.  
Permission is hereby granted for the redistribution of this advisory,  
provided that it is not altered except by reformatting it, and  
that due credit is given. Permission is explicitly given for insertion in  
vulnerability databases and similar, provided that due credit  
is given to the author. The author is not responsible for any misuse of the  
information contained herein and accepts no responsibility  
for any damage caused by the use or misuse of this information. The author  
prohibits any malicious use of security related information  
or exploits by the author or elsewhere.  
  
hyp3rlinx  
`