bugtraq - Adobe Animate <= v15.2.1.95 Memory Corruption Vulnerability

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Date: Wed, 14 Dec 2016 18:09:43 GMT
From: apparitionsec@...il.com (hyp3rlinx)
To: bugtraq@...urityfocus.com
Subject: Adobe Animate <= v15.2.1.95 Memory Corruption Vulnerability

[+] 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