Adobe Animate 15.2.1.95 - Memory Corruption

[+] 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.